Add samples.

commit 469caf656e
Author: Christian <6939810+chkr1011@users.noreply.github.com>
Date:   Sun Jul 31 10:55:40 2022 +0200

    Fix build errors.

commit 42402fba04
Author: Christian <6939810+chkr1011@users.noreply.github.com>
Date:   Sun Jul 31 10:22:23 2022 +0200

    Allow interception of injected application messages.

commit a0dc8ab0d7
Author: William Lee <31092948+william19821101@users.noreply.github.com>
Date:   Sun Jul 31 15:50:14 2022 +0800

    Update Server_Simple_Samples.cs (#1474)

    Change e.UserName to e.Username

.bettercodehub.yml

@@ -1,3 +0,0 @@
-component_depth: 2
-languages:
-- csharp

.editorconfig

@@ -1,5 +1,84 @@
-[*.cs]
+[*.cs]
 
 
 # CA1031: Do not catch general exception types
-dotnet_diagnostic.CA1031.severity = none
+
+# Microsoft .NET properties
+csharp_new_line_before_members_in_object_initializers = false
+csharp_preferred_modifier_order = public, private, protected, internal, new, abstract, virtual, sealed, override, static, readonly, extern, unsafe, volatile, async:suggestion
+csharp_style_var_elsewhere = true:suggestion
+csharp_style_var_for_built_in_types = true:suggestion
+csharp_style_var_when_type_is_apparent = true:suggestion
+dotnet_naming_rule.constants_rule.severity = warning
+dotnet_naming_rule.constants_rule.style = upper_camel_case_style
+dotnet_naming_rule.constants_rule.symbols = constants_symbols
+dotnet_naming_rule.public_fields_rule.severity = warning
+dotnet_naming_rule.public_fields_rule.style = lower_camel_case_style
+dotnet_naming_rule.public_fields_rule.symbols = public_fields_symbols
+dotnet_naming_rule.static_readonly_rule.severity = warning
+dotnet_naming_rule.static_readonly_rule.style = upper_camel_case_style
+dotnet_naming_rule.static_readonly_rule.symbols = static_readonly_symbols
+dotnet_naming_style.lower_camel_case_style.capitalization = camel_case
+dotnet_naming_style.lower_camel_case_style.required_prefix = _
+dotnet_naming_style.upper_camel_case_style.capitalization = pascal_case
+dotnet_naming_symbols.constants_symbols.applicable_accessibilities = public,internal,protected,protected_internal,private_protected
+dotnet_naming_symbols.constants_symbols.applicable_kinds = field
+dotnet_naming_symbols.constants_symbols.required_modifiers = const
+dotnet_naming_symbols.public_fields_symbols.applicable_accessibilities = public,internal,protected,protected_internal,private_protected
+dotnet_naming_symbols.public_fields_symbols.applicable_kinds = field
+dotnet_naming_symbols.static_readonly_symbols.applicable_accessibilities = public,internal,protected,protected_internal,private_protected
+dotnet_naming_symbols.static_readonly_symbols.applicable_kinds = field
+dotnet_naming_symbols.static_readonly_symbols.required_modifiers = static,readonly
+dotnet_style_parentheses_in_arithmetic_binary_operators = never_if_unnecessary:none
+dotnet_style_parentheses_in_other_binary_operators = never_if_unnecessary:none
+dotnet_style_parentheses_in_relational_binary_operators = never_if_unnecessary:none
+dotnet_style_predefined_type_for_locals_parameters_members = true:suggestion
+dotnet_style_predefined_type_for_member_access = true:suggestion
+dotnet_style_qualification_for_event = false:suggestion
+dotnet_style_qualification_for_field = false:suggestion
+dotnet_style_qualification_for_method = false:suggestion
+dotnet_style_qualification_for_property = false:suggestion
+
+# ReSharper properties
+resharper_autodetect_indent_settings = true
+resharper_default_private_modifier = implicit
+resharper_place_accessorholder_attribute_on_same_line = false
+resharper_use_indent_from_vs = false
+
+# ReSharper inspection severities
+resharper_arrange_redundant_parentheses_highlighting = hint
+resharper_arrange_this_qualifier_highlighting = hint
+resharper_built_in_type_reference_style_for_member_access_highlighting = hint
+resharper_built_in_type_reference_style_highlighting = hint
+resharper_redundant_base_qualifier_highlighting = warning
+resharper_suggest_var_or_type_built_in_types_highlighting = hint
+resharper_suggest_var_or_type_elsewhere_highlighting = hint
+resharper_suggest_var_or_type_simple_types_highlighting = hint
+resharper_web_config_module_not_resolved_highlighting = warning
+resharper_web_config_type_not_resolved_highlighting = warning
+resharper_web_config_wrong_module_highlighting = warning
+
+[*]
+charset = utf-8
+end_of_line = crlf
+trim_trailing_whitespace = false
+insert_final_newline = false
+indent_style = space
+indent_size = 4
+
+[{*.har,*.inputactions,*.jsb2,*.jsb3,*.json,.babelrc,.eslintrc,.stylelintrc,bowerrc,jest.config}]
+indent_style = space
+indent_size = 2
+
+[{*.yaml,*.yml}]
+indent_style = space
+indent_size = 2
+
+[{tsconfig.app.json,tsconfig.e2e.json,tsconfig.json,tsconfig.lib.json,tsconfig.spec.json}]
+indent_style = space
+indent_size = 2
+
+[*.{appxmanifest,asax,ascx,aspx,axaml,build,cg,cginc,compute,cs,cshtml,dtd,hlsl,hlsli,hlslinc,master,nuspec,paml,razor,resw,resx,shader,skin,usf,ush,vb,xaml,xamlx,xoml,xsd}]
+indent_style = space
+indent_size = 4
+tab_width = 4

.gitattributes

@@ -1,63 +1 @@
-###############################################################################
-# Set default behavior to automatically normalize line endings.
-###############################################################################
-* text=auto
-
-###############################################################################
-# Set default behavior for command prompt diff.
-#
-# This is need for earlier builds of msysgit that does not have it on by
-# default for csharp files.
-# Note: This is only used by command line
-###############################################################################
-#*.cs     diff=csharp
-
-###############################################################################
-# Set the merge driver for project and solution files
-#
-# Merging from the command prompt will add diff markers to the files if there
-# are conflicts (Merging from VS is not affected by the settings below, in VS
-# the diff markers are never inserted). Diff markers may cause the following 
-# file extensions to fail to load in VS. An alternative would be to treat
-# these files as binary and thus will always conflict and require user
-# intervention with every merge. To do so, just uncomment the entries below
-###############################################################################
-#*.sln       merge=binary
-#*.csproj    merge=binary
-#*.vbproj    merge=binary
-#*.vcxproj   merge=binary
-#*.vcproj    merge=binary
-#*.dbproj    merge=binary
-#*.fsproj    merge=binary
-#*.lsproj    merge=binary
-#*.wixproj   merge=binary
-#*.modelproj merge=binary
-#*.sqlproj   merge=binary
-#*.wwaproj   merge=binary
-
-###############################################################################
-# behavior for image files
-#
-# image files are treated as binary by default.
-###############################################################################
-#*.jpg   binary
-#*.png   binary
-#*.gif   binary
-
-###############################################################################
-# diff behavior for common document formats
-# 
-# Convert binary document formats to text before diffing them. This feature
-# is only available from the command line. Turn it on by uncommenting the 
-# entries below.
-###############################################################################
-#*.doc   diff=astextplain
-#*.DOC   diff=astextplain
-#*.docx  diff=astextplain
-#*.DOCX  diff=astextplain
-#*.dot   diff=astextplain
-#*.DOT   diff=astextplain
-#*.pdf   diff=astextplain
-#*.PDF   diff=astextplain
-#*.rtf   diff=astextplain
-#*.RTF   diff=astextplain
+* text=auto

.github/ISSUE_TEMPLATE/bug_report.md

@@ -7,16 +7,25 @@ assignees: ''
 
 ---
 
+### Verification
+
+Before opening a bug make sure that the following conditions are met.
+<!-- Remove this chapter when all conditions are met. -->
+
+1. Performance issues are also appearing in RELEASE mode of your application.
+2. An increased memory consumption or high CPU load also happens when your application runs in RELEASE mode AND logging is DISABLED.
+3. Client issues with not received messages, connection drops etc. can be reproduced via another client application like "MQTTnetApp" (https://github.com/chkr1011/MQTTnetApp) or similar.
+4. The bug also appears in the VERY LATEST version of this library. There is no support for older version (due to limited resources) but pull requests for older versions are welcome.
+
 ### Describe the bug
 A clear and concise description of what the bug is.
 
-### Which project is your bug related to?
-<!-- Remove the items which don't apply from the following list -->
+### Which component is your bug related to?
+<!-- Remove the items which don't apply from the following list. -->
 - Client
 - ManagedClient
-- MQTTnet.Server standalone
+- RpcClient
 - Server
-- Generic
 
 ### To Reproduce
 Steps to reproduce the behavior:
@@ -39,7 +48,9 @@ Include debugging or logging information here:
 \\ Put your logging output here.
 ```
 ### Code example
- Please provide full code examples below where possible to make it easier for the developers to check your issues.
+Please provide full code examples below where possible to make it easier for the developers to check your issues.
+
+**Ideally a Unit Test (which shows the error) is provided so that the behavior can be reproduced easily.**
  
 ```csharp
 \\ Put your code here.

.github/ISSUE_TEMPLATE/custom.md

@@ -14,6 +14,5 @@ A clear and concise description of what you want to know.
 <!-- Remove the items which don't apply from the following list -->
 - Client
 - ManagedClient
-- MQTTnet.Server standalone
 - Server
 - Generic

.github/ISSUE_TEMPLATE/feature_request.md

@@ -15,7 +15,6 @@ A clear and concise description of what the problem is. Example. I'm am trying t
 <!-- Remove the items which don't apply from the following list -->
 - Client
 - ManagedClient
-- MQTTnet.Server standalone
 - Server
 - Generic
 

.github/workflows/ci.yml

@@ -0,0 +1,67 @@
+name: CI
+
+on: [push, pull_request]
+
+env:
+  VERSION: "4.1.0.${{github.run_number}}"
+
+jobs:
+  build:
+
+    runs-on: windows-2022
+
+    steps:
+      - name: Setup Windows SDK
+        uses: GuillaumeFalourd/setup-windows10-sdk-action@v1
+        with:
+          sdk-version: 18362
+
+      - name: Setup .NET SDK
+        uses: actions/setup-dotnet@v1.9.0
+        with:
+          dotnet-version: |
+            3.1.x
+            6.0.x
+
+      - name: Setup MSBuild
+        uses: microsoft/setup-msbuild@v1.1
+
+      - name: Checkout Code
+        uses: actions/checkout@v2
+
+      - name: Setup Signing Certificate
+        run: |
+          $secret = '${{ secrets.SNC_BASE64 }}'
+          $decoded = [System.Convert]::FromBase64CharArray($secret, 0, $secret.Length)
+          Set-Content -Path ${{ github.workspace }}\certificate.snk -Value $decoded -AsByteStream
+
+      - name: Restore nuget packages
+        run: msbuild MQTTnet.sln /t:Restore /p:Configuration="Release" /verbosity:m
+
+      - name: Build solution
+        run: msbuild MQTTnet.sln /t:Build /p:Configuration="Release" /verbosity:m /p:FileVersion=${{ env.VERSION }} /p:AssemblyVersion=${{ env.VERSION }} /p:PackageVersion=${{ env.VERSION }} /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=${{ github.workspace }}\certificate.snk
+
+      - name: Collect nuget Packages
+        uses: actions/upload-artifact@v2
+        with:
+          name: nuget Packages
+          path: |
+            **\*.nupkg
+            **\*.snupkg
+
+      - name: Setup VSTest
+        uses: darenm/Setup-VSTest@v1
+
+      - name: Core Tests
+        run: vstest.console.exe Source\MQTTnet.Tests\bin\Release\net6.0\MQTTnet.Tests.dll
+
+      - name: ASP.NET Tests
+        run: vstest.console.exe Source\MQTTnet.AspNetCore.Tests\bin\Release\netcoreapp3.1\MQTTnet.AspNetCore.Tests.dll
+
+      - name: Publish MyGet nugets
+        if: ${{ github.event_name == 'push' }}
+        run: dotnet nuget push **/*.nupkg -k ${{ secrets.MYGET_API_KEY }} -s https://www.myget.org/F/mqttnet/api/v3/index.json --skip-duplicate
+
+#      - name: Publish nugets
+#        if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' }}
+#        run: dotnet nuget push **/*.nupkg -k ${{ secrets.NUGET_API_KEY }} -s https://api.nuget.org/v3/index.json --skip-duplicate

.gitignore

@@ -294,3 +294,5 @@ __pycache__/
 /Tests/MQTTnet.TestApp.NetCore/RetainedMessages.json
 
 Build/NuGet/
+
+Build/nuget.exe

Build/MQTTnet.AspNetCore.nuspec

@@ -1,42 +0,0 @@
-<?xml version="1.0"?>
-<package >
-  <metadata>
-    <id>MQTTnet.AspNetCore</id>
-    <version>0.0.0</version>
-    <authors>The contributors of MQTTnet</authors>
-    <owners>Christian Kratky</owners>
-    <license type="file">LICENSE</license>
-    <projectUrl>https://github.com/chkr1011/MQTTnet</projectUrl>
-    <iconUrl>https://raw.githubusercontent.com/chkr1011/MQTTnet/master/Images/Logo_128x128.png</iconUrl>
-    <icon>images\Logo_128x128.png</icon>
-    <requireLicenseAcceptance>true</requireLicenseAcceptance>
-    <description>This is a support library to integrate MQTTnet into AspNetCore.</description>
-    <releaseNotes>For release notes please go to MQTTnet release notes (https://www.nuget.org/packages/MQTTnet/).</releaseNotes>
-    <copyright>Copyright Christian Kratky 2016-2020</copyright>
-    <tags>MQTT Message Queue Telemetry Transport MQTTClient MQTTServer Server MQTTBroker Broker NETStandard IoT InternetOfThings Messaging Hardware Arduino Sensor Actuator M2M ESP Smart Home Cities Automation Xamarin Blazor</tags>
-    <dependencies>
-      <group targetFramework="netstandard2.0">
-        <dependency id="MQTTnet" version="$nugetVersion" />
-        <dependency id="Microsoft.AspNetCore.Http.Connections" version="1.0.0"  />
-      </group>
-      
-      <group targetFramework="netcoreapp3.1">
-        <dependency id="MQTTnet" version="$nugetVersion" />
-      </group>
-    </dependencies>
-  </metadata>
-
-  <files>
-    <!-- License -->
-    <file src="..\LICENSE" />
-
-    <!-- Images -->
-    <file src="..\Images\Logo_128x128.png" target="images\" />
-
-    <!-- .NET Standard 2.0 -->
-    <file src="..\Source\MQTTnet.AspNetCore\bin\Release\netstandard2.0\MQTTnet.AspNetCore.*" target="lib\netstandard2.0\"/>
-    
-    <!-- .NET Core App 3.1 -->
-    <file src="..\Source\MQTTnet.AspNetCore\bin\Release\netcoreapp3.1\MQTTnet.AspNetCore.*" target="lib\netcoreapp3.1\"/>
-  </files>
-</package>

Build/MQTTnet.Extensions.ManagedClient.nuspec

@@ -1,46 +0,0 @@
-<?xml version="1.0"?>
-<package >
-  <metadata>
-    <id>MQTTnet.Extensions.ManagedClient</id>
-    <version>0.0.0</version>
-    <authors>The contributors of MQTTnet</authors>
-    <owners>Christian Kratky</owners>
-    <license type="file">LICENSE</license>
-    <projectUrl>https://github.com/chkr1011/MQTTnet</projectUrl>
-    <iconUrl>https://raw.githubusercontent.com/chkr1011/MQTTnet/master/Images/Logo_128x128.png</iconUrl>
-    <icon>images\Logo_128x128.png</icon>
-    <requireLicenseAcceptance>true</requireLicenseAcceptance>
-    <description>This is an extension library which provides a managed MQTT client with additional features using MQTTnet.</description>
-    <releaseNotes>For release notes please go to MQTTnet release notes (https://www.nuget.org/packages/MQTTnet/).</releaseNotes>
-    <copyright>Copyright Christian Kratky 2016-2020</copyright>
-    <tags>MQTT Message Queue Telemetry Transport MQTTClient MQTTServer Server MQTTBroker Broker NETStandard IoT InternetOfThings Messaging Hardware Arduino Sensor Actuator M2M ESP Smart Home Cities Automation Xamarin Blazor</tags> 
-    <dependencies>
-      <dependency id="MQTTnet" version="$nugetVersion" />
-    </dependencies>
-  </metadata>
-
-  <files>
-    <!-- License -->
-    <file src="..\LICENSE" />
-
-    <!-- Images -->
-    <file src="..\Images\Logo_128x128.png" target="images\" />
-
-    <!-- .NET Standard 1.3 -->
-    <file src="..\Source\MQTTnet.Extensions.ManagedClient\bin\Release\netstandard1.3\MQTTnet.Extensions.ManagedClient.*" target="lib\netstandard1.3\"/>
-
-    <!-- .NET Standard 2.0 -->
-    <file src="..\Source\MQTTnet.Extensions.ManagedClient\bin\Release\netstandard2.0\MQTTnet.Extensions.ManagedClient.*" target="lib\netstandard2.0\"/>
-
-    <!-- Universal Windows -->
-    <file src="..\Source\MQTTnet.Extensions.ManagedClient\bin\Release\uap10.0\MQTTnet.Extensions.ManagedClient.*" target="lib\uap10.0\"/>
-
-    <!-- .NET Framework -->
-    <file src="..\Source\MQTTnet.Extensions.ManagedClient\bin\Release\net452\MQTTnet.Extensions.ManagedClient.*" target="lib\net452\"/>
-
-    <!-- .NET Framework 4.6.0 will use binaries from 4.5.2. -->
-    <file src="..\Source\MQTTnet.Extensions.ManagedClient\bin\Release\net461\MQTTnet.Extensions.Rpc.*" target="lib\net461\"/>
-
-    <!-- Everything above .NET Framework 4.6.1 will use the binaries from 4.6.1. -->
-  </files>
-</package>

Build/MQTTnet.Extensions.Rpc.nuspec

@@ -1,46 +0,0 @@
-<?xml version="1.0"?>
-<package >
-  <metadata>
-    <id>MQTTnet.Extensions.Rpc</id>
-    <version>0.0.0</version>
-    <authors>The contributors of MQTTnet</authors>
-    <owners>Christian Kratky</owners>
-    <license type="file">LICENSE</license>
-    <projectUrl>https://github.com/chkr1011/MQTTnet</projectUrl>
-    <iconUrl>https://raw.githubusercontent.com/chkr1011/MQTTnet/master/Images/Logo_128x128.png</iconUrl>
-    <icon>images\Logo_128x128.png</icon>
-    <requireLicenseAcceptance>true</requireLicenseAcceptance>
-    <description>This is an extension library which allows executing synchronous device calls including a response using MQTTnet.</description>
-    <releaseNotes>For release notes please go to MQTTnet release notes (https://www.nuget.org/packages/MQTTnet/).</releaseNotes>
-    <copyright>Copyright Christian Kratky 2016-2020</copyright>
-    <tags>MQTT Message Queue Telemetry Transport MQTTClient MQTTServer Server MQTTBroker Broker NETStandard IoT InternetOfThings Messaging Hardware Arduino Sensor Actuator M2M ESP Smart Home Cities Automation Xamarin Blazor</tags> 
-    <dependencies>
-      <dependency id="MQTTnet" version="$nugetVersion" />
-    </dependencies>
-  </metadata>
-
-  <files>
-    <!-- License -->
-    <file src="..\LICENSE" />
-
-    <!-- Images -->
-    <file src="..\Images\Logo_128x128.png" target="images\" />
-
-    <!-- .NET Standard 1.3 -->
-    <file src="..\Source\MQTTnet.Extensions.Rpc\bin\Release\netstandard1.3\MQTTnet.Extensions.Rpc.*" target="lib\netstandard1.3\"/>
-
-    <!-- .NET Standard 2.0 -->
-    <file src="..\Source\MQTTnet.Extensions.Rpc\bin\Release\netstandard2.0\MQTTnet.Extensions.Rpc.*" target="lib\netstandard2.0\"/>
-
-    <!-- Universal Windows -->
-    <file src="..\Source\MQTTnet.Extensions.Rpc\bin\Release\uap10.0\MQTTnet.Extensions.Rpc.*" target="lib\uap10.0\"/>
-
-    <!-- .NET Framework -->
-    <file src="..\Source\MQTTnet.Extensions.Rpc\bin\Release\net452\MQTTnet.Extensions.Rpc.*" target="lib\net452\"/>
-
-    <!-- .NET Framework 4.6.0 will use binaries from 4.5.2. -->
-    <file src="..\Source\MQTTnet.Extensions.Rpc\bin\Release\net461\MQTTnet.Extensions.Rpc.*" target="lib\net461\"/>
-
-    <!-- Everything above .NET Framework 4.6.1 will use the binaries from 4.6.1. -->
-  </files>
-</package>

Build/MQTTnet.Extensions.WebSocket4Net.nuspec

@@ -1,61 +0,0 @@
-<?xml version="1.0"?>
-<package >
-  <metadata>
-    <id>MQTTnet.Extensions.WebSocket4Net</id>
-    <version>0.0.0</version>
-    <authors>The contributors of MQTTnet</authors>
-    <owners>Christian Kratky</owners>
-    <license type="file">LICENSE</license>
-    <projectUrl>https://github.com/chkr1011/MQTTnet</projectUrl>
-    <iconUrl>https://raw.githubusercontent.com/chkr1011/MQTTnet/master/Images/Logo_128x128.png</iconUrl>
-    <icon>images\Logo_128x128.png</icon>
-    <requireLicenseAcceptance>true</requireLicenseAcceptance>
-    <description>This is an extension library which allows using _WebSocket4Net_ as transport for MQTTnet clients.</description>
-    <releaseNotes>For release notes please go to MQTTnet release notes (https://www.nuget.org/packages/MQTTnet/).</releaseNotes>
-    <copyright>Copyright Christian Kratky 2016-2020</copyright>
-    <tags>MQTT Message Queue Telemetry Transport MQTTClient MQTTServer Server MQTTBroker Broker NETStandard IoT InternetOfThings Messaging Hardware Arduino Sensor Actuator M2M ESP Smart Home Cities Automation Xamarin Blazor</tags> 
-    <dependencies>
-    <group targetFramework="netstandard1.3">
-        <dependency id="MQTTnet" version="$nugetVersion" />
-        <dependency id="WebSocket4Net" version="0.15.2" />
-      </group>
-      <group targetFramework="netstandard2.0">
-        <dependency id="MQTTnet" version="$nugetVersion" />
-        <dependency id="WebSocket4Net" version="0.15.2" />
-      </group>
-      <group targetFramework="netstandard2.1">
-        <dependency id="MQTTnet" version="$nugetVersion" />
-        <dependency id="WebSocket4Net" version="0.15.2" />
-      </group>
-      <group targetFramework="uap10.0">
-        <dependency id="MQTTnet" version="$nugetVersion" />
-        <dependency id="WebSocket4Net" version="0.15.2" />
-      </group>
-    </dependencies>
-  </metadata>
-
-  <files>
-    <!-- License -->
-    <file src="..\LICENSE" />
-
-    <!-- Images -->
-    <file src="..\Images\Logo_128x128.png" target="images\" />
-
-    <!-- .NET Standard 1.3 -->
-    <file src="..\Source\MQTTnet.Extensions.WebSocket4Net\bin\Release\netstandard1.3\MQTTnet.Extensions.WebSocket4Net.*" target="lib\netstandard1.3\"/>
-
-    <!-- .NET Standard 2.0 -->
-    <file src="..\Source\MQTTnet.Extensions.WebSocket4Net\bin\Release\netstandard2.0\MQTTnet.Extensions.WebSocket4Net.*" target="lib\netstandard2.0\"/>
-
-    <!-- Universal Windows -->
-    <file src="..\Source\MQTTnet.Extensions.WebSocket4Net\bin\Release\uap10.0\MQTTnet.Extensions.WebSocket4Net.*" target="lib\uap10.0\"/>
-
-    <!-- .NET Framework -->
-    <file src="..\Source\MQTTnet.Extensions.WebSocket4Net\bin\Release\net452\MQTTnet.Extensions.WebSocket4Net.*" target="lib\net452\"/>
-
-    <!-- .NET Framework 4.6.0 will use binaries from 4.5.2. -->
-    <file src="..\Source\MQTTnet.Extensions.WebSocket4Net\bin\Release\net461\MQTTnet.Extensions.WebSocket4Net.*" target="lib\net461\"/>
-
-    <!-- Everything above .NET Framework 4.6.1 will use the binaries from 4.6.1. -->
-  </files>
-</package>

Build/MQTTnet.nuspec

@@ -1,86 +0,0 @@
-<?xml version="1.0"?>
-<package >
-  <metadata>
-    <id>MQTTnet</id>
-    <version>0.0.0</version>
-    <authors>The contributors of MQTTnet</authors>
-    <owners>Christian Kratky</owners>
-    <license type="file">LICENSE</license>
-    <projectUrl>https://github.com/chkr1011/MQTTnet</projectUrl>
-    <iconUrl>https://raw.githubusercontent.com/chkr1011/MQTTnet/master/Images/Logo_128x128.png</iconUrl>
-    <icon>images\Logo_128x128.png</icon>
-    <requireLicenseAcceptance>true</requireLicenseAcceptance>
-    <description>MQTTnet is a high performance .NET library for MQTT based communication. It provides a MQTT client and a MQTT server (broker) and supports v3.1.0, v3.1.1 and v5.0.0 of the MQTT protocol.</description>
-    <releaseNotes>
-* [Client] Fixed wrong value for "ClientWasConnected" in "MqttClientDisconnectedEventArgs" #976 (thanks to @dbeinder).
-* [Client] Added direct support for Amazon AWS connections (requires .NET Core 3.1) (thanks to @henning-krause).
-* [Client] handle disconnect package and propagate disconnect reason code (thanks to @JanEggers)
-* [ManagedClient] Exposed the internal MQTT client.
-* [Server] Added client message queue interceptor for QoS level (thanks to @msallin).
-* [Server] improved behavior when multiple connections fight over a session (thanks to @JanEggers)
-* [Server] Exposed _ClientDisconnectedInterceptor_ (thanks to @SeppPenner).
-    </releaseNotes>
-    <copyright>Copyright Christian Kratky 2016-2020</copyright>
-    <tags>MQTT Message Queue Telemetry Transport MQTTClient MQTTServer Server MQTTBroker Broker NETStandard IoT InternetOfThings Messaging Hardware Arduino Sensor Actuator M2M ESP Smart Home Cities Automation Xamarin Blazor</tags> 
-    <dependencies>
-      <group targetFramework="netstandard1.3">
-        <dependency id="NETStandard.Library" version="1.3.0" />
-        <dependency id="System.Net.Security" version="4.3.2" />
-        <dependency id="System.Net.WebSockets" version="4.3.0" />
-        <dependency id="System.Net.WebSockets.Client" version="4.3.2" />      
-      </group>
-      <group targetFramework="netstandard2.0">
-        <dependency id="NETStandard.Library" version="2.0.0" />
-        <dependency id="System.Net.Security" version="4.3.2" />
-        <dependency id="System.Net.WebSockets" version="4.3.0" />
-        <dependency id="System.Net.WebSockets.Client" version="4.3.2" />
-      </group>
-      <group targetFramework="netstandard2.1">
-        <dependency id="NETStandard.Library" version="2.0.0" />
-        <dependency id="System.Net.Security" version="4.3.2" />
-        <dependency id="System.Net.WebSockets" version="4.3.0" />
-        <dependency id="System.Net.WebSockets.Client" version="4.3.2" />
-      </group>
-      <group targetFramework="netcoreapp3.1">
-        <dependency id="NETStandard.Library" version="2.0.0" />
-        <dependency id="System.Net.Security" version="4.3.2" />
-        <dependency id="System.Net.WebSockets" version="4.3.0" />
-        <dependency id="System.Net.WebSockets.Client" version="4.3.2" />
-      </group>
-      <group targetFramework="uap10.0">
-        <dependency id="Microsoft.NETCore.UniversalWindowsPlatform" version="6.2.10" />
-      </group>
-    </dependencies>
-  </metadata>
-
-  <files>
-    <!-- License -->
-    <file src="..\LICENSE" />
-
-    <!-- Images -->
-    <file src="..\Images\Logo_128x128.png" target="images\" />
-
-    <!-- .NET Standard 1.3 -->
-    <file src="..\Source\MQTTnet\bin\Release\netstandard1.3\MQTTnet.*" target="lib\netstandard1.3\"/>
-    
-    <!-- .NET Standard 2.0 -->
-    <file src="..\Source\MQTTnet\bin\Release\netstandard2.0\MQTTnet.*" target="lib\netstandard2.0\"/>
-
-    <!-- .NET Standard 2.1 -->
-    <file src="..\Source\MQTTnet\bin\Release\netstandard2.1\MQTTnet.*" target="lib\netstandard2.1\"/>
-
-    <!-- .NET Standard 3.1 -->
-    <file src="..\Source\MQTTnet\bin\Release\netcoreapp3.1\MQTTnet.*" target="lib\netcoreapp3.1\"/>
-
-    <!-- Universal Windows -->
-    <file src="..\Source\MQTTnet\bin\Release\uap10.0\MQTTnet.*" target="lib\uap10.0\"/>
-
-    <!-- .NET Framework -->
-    <file src="..\Source\MQTTnet\bin\Release\net452\MQTTnet.*" target="lib\net452\"/>
-
-    <!-- .NET Framework 4.6.0 will use binaries from 4.5.2. -->
-    <file src="..\Source\MQTTnet\bin\Release\net461\MQTTnet.*" target="lib\net461\"/>
-
-    <!-- Everything above .NET Framework 4.6.1 will use the binaries from 4.6.1. -->
-  </files>
-</package>

Build/build.ps1

@@ -1,134 +0,0 @@
-param([string]$assemblyVersion, [string]$nugetVersion)
-
-if ([string]::IsNullOrEmpty($assemblyVersion)) {$assemblyVersion = "0.0.1"}
-if ([string]::IsNullOrEmpty($nugetVersion)) {$nugetVersion = "0.0.1"}
-
-$vswhere = ${Env:\ProgramFiles(x86)} + '\Microsoft Visual Studio\Installer\vswhere'
-$msbuild = &$vswhere -products * -requires Microsoft.Component.MSBuild -latest -find MSBuild\**\Bin\MSBuild.exe
-
-Write-Host
-Write-Host "Assembly version = $assemblyVersion"
-Write-Host "Nuget version    = $nugetVersion"
-Write-Host "MSBuild path     = $msbuild"
-Write-Host
-
-Invoke-WebRequest -Uri "https://dist.nuget.org/win-x86-commandline/latest/nuget.exe" -OutFile "nuget.exe"
-
-.\nuget.exe restore ..\MQTTnet.sln
-
-# Build and execute tests
-&$msbuild ..\Tests\MQTTnet.Core.Tests\MQTTnet.Tests.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netcoreapp3.1" /verbosity:m
-&$msbuild ..\Tests\MQTTnet.AspNetCore.Tests\MQTTnet.AspNetCore.Tests.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netcoreapp3.1" /verbosity:m
-
-vstest.console.exe ..\Tests\MQTTnet.Core.Tests\bin\Release\netcoreapp3.1\MQTTnet.Tests.dll
-vstest.console.exe ..\Tests\MQTTnet.AspNetCore.Tests\bin\Release\netcoreapp3.1\MQTTnet.AspNetCore.Tests.dll
-
-# Build the core library
-&$msbuild ..\Source\MQTTnet\MQTTnet.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="net452" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet\MQTTnet.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="net461" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet\MQTTnet.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netstandard1.3" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet\MQTTnet.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netstandard2.0" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet\MQTTnet.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netstandard2.1" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet\MQTTnet.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netcoreapp3.1" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet\MQTTnet.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="uap10.0" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-
-# Build the ASP.NET Core 2.0 extension
-&$msbuild ..\Source\MQTTnet.AspNetCore\MQTTnet.AspNetCore.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netstandard2.0" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet.AspNetCore\MQTTnet.AspNetCore.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netcoreapp3.1" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-
-# Build the RPC extension
-&$msbuild ..\Source\MQTTnet.Extensions.Rpc\MQTTnet.Extensions.Rpc.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="net452" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet.Extensions.Rpc\MQTTnet.Extensions.Rpc.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="net461" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet.Extensions.Rpc\MQTTnet.Extensions.Rpc.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netstandard1.3" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet.Extensions.Rpc\MQTTnet.Extensions.Rpc.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netstandard2.0" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet.Extensions.Rpc\MQTTnet.Extensions.Rpc.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netstandard2.1" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet.Extensions.Rpc\MQTTnet.Extensions.Rpc.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="uap10.0" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-
-# Build the Managed Client extension
-&$msbuild ..\Source\MQTTnet.Extensions.ManagedClient\MQTTnet.Extensions.ManagedClient.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="net452" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet.Extensions.ManagedClient\MQTTnet.Extensions.ManagedClient.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="net461" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet.Extensions.ManagedClient\MQTTnet.Extensions.ManagedClient.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netstandard1.3" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet.Extensions.ManagedClient\MQTTnet.Extensions.ManagedClient.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netstandard2.0" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet.Extensions.ManagedClient\MQTTnet.Extensions.ManagedClient.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netstandard2.1" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet.Extensions.ManagedClient\MQTTnet.Extensions.ManagedClient.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="uap10.0" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-
-# Build the WebSocket4Net extension
-&$msbuild ..\Source\MQTTnet.Extensions.WebSocket4Net\MQTTnet.Extensions.WebSocket4Net.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="net452" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet.Extensions.WebSocket4Net\MQTTnet.Extensions.WebSocket4Net.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="net461" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet.Extensions.WebSocket4Net\MQTTnet.Extensions.WebSocket4Net.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netstandard1.3" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet.Extensions.WebSocket4Net\MQTTnet.Extensions.WebSocket4Net.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netstandard2.0" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet.Extensions.WebSocket4Net\MQTTnet.Extensions.WebSocket4Net.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netstandard2.1" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-&$msbuild ..\Source\MQTTnet.Extensions.WebSocket4Net\MQTTnet.Extensions.WebSocket4Net.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="uap10.0" /p:FileVersion=$assemblyVersion /p:AssemblyVersion=$assemblyVersion /verbosity:m /p:SignAssembly=true /p:AssemblyOriginatorKeyFile=".\..\..\Build\codeSigningKey.pfx"
-
-# Create NuGet packages.
-
-Remove-Item .\NuGet -Force -Recurse -ErrorAction SilentlyContinue
-
-Copy-Item MQTTnet.AspNetCore.nuspec -Destination MQTTnet.AspNetCore.nuspec.old -Force
-(Get-Content MQTTnet.AspNetCore.nuspec) -replace '\$nugetVersion', $nugetVersion | Set-Content MQTTnet.AspNetCore.nuspec
-Copy-Item MQTTnet.Extensions.Rpc.nuspec -Destination MQTTnet.Extensions.Rpc.nuspec.old -Force
-(Get-Content MQTTnet.Extensions.Rpc.nuspec) -replace '\$nugetVersion', $nugetVersion | Set-Content MQTTnet.Extensions.Rpc.nuspec
-Copy-Item MQTTnet.Extensions.ManagedClient.nuspec -Destination MQTTnet.Extensions.ManagedClient.nuspec.old -Force
-(Get-Content MQTTnet.Extensions.ManagedClient.nuspec) -replace '\$nugetVersion', $nugetVersion | Set-Content MQTTnet.Extensions.ManagedClient.nuspec
-Copy-Item MQTTnet.Extensions.WebSocket4Net.nuspec -Destination MQTTnet.Extensions.WebSocket4Net.nuspec.old -Force
-(Get-Content MQTTnet.Extensions.WebSocket4Net.nuspec) -replace '\$nugetVersion', $nugetVersion | Set-Content MQTTnet.Extensions.WebSocket4Net.nuspec
-
-New-Item -ItemType Directory -Force -Path .\NuGet
-.\nuget.exe pack MQTTnet.nuspec -Verbosity detailed -Symbols -SymbolPackageFormat snupkg -OutputDir "NuGet" -Version $nugetVersion
-.\nuget.exe pack MQTTnet.AspNetCore.nuspec -Verbosity detailed -Symbols -SymbolPackageFormat snupkg -OutputDir "NuGet" -Version $nugetVersion
-.\nuget.exe pack MQTTnet.Extensions.Rpc.nuspec -Verbosity detailed -Symbols -SymbolPackageFormat snupkg -OutputDir "NuGet" -Version $nugetVersion
-.\nuget.exe pack MQTTnet.Extensions.ManagedClient.nuspec -Verbosity detailed -Symbols -SymbolPackageFormat snupkg -OutputDir "NuGet" -Version $nugetVersion
-.\nuget.exe pack MQTTnet.Extensions.WebSocket4Net.nuspec -Verbosity detailed -Symbols -SymbolPackageFormat snupkg -OutputDir "NuGet" -Version $nugetVersion
-
-Move-Item MQTTnet.AspNetCore.nuspec.old -Destination MQTTnet.AspNetCore.nuspec -Force
-Move-Item MQTTnet.Extensions.Rpc.nuspec.old -Destination MQTTnet.Extensions.Rpc.nuspec -Force
-Move-Item MQTTnet.Extensions.ManagedClient.nuspec.old -Destination MQTTnet.Extensions.ManagedClient.nuspec -Force
-Move-Item MQTTnet.Extensions.WebSocket4Net.nuspec.old -Destination MQTTnet.Extensions.WebSocket4Net.nuspec -Force
-
-Remove-Item "nuget.exe" -Force -Recurse -ErrorAction SilentlyContinue
-
-####################################################################
-
-# Build MQTTnet.Server Portable
-&dotnet publish ..\Source\MQTTnet.Server\MQTTnet.Server.csproj --configuration Release /p:FileVersion=$assemblyVersion /p:Version=$nugetVersion
-
-$source = (Convert-Path .) + "\..\Source\MQTTnet.Server\bin\Release\netcoreapp3.1\publish"
-$destination = (Convert-Path .) + "\..\Source\MQTTnet.Server\bin\MQTTnet.Server-Portable-v$nugetVersion.zip"
-If(Test-path $destination) {Remove-item $destination}
- Add-Type -assembly "system.io.compression.filesystem"
-[io.compression.zipfile]::CreateFromDirectory($source, $destination) 
-
-####################################################################
-
-# Build MQTTnet.Server Linux-x64
-&dotnet publish ..\Source\MQTTnet.Server\MQTTnet.Server.csproj --configuration Release /p:FileVersion=$assemblyVersion /p:Version=$nugetVersion --self-contained --runtime linux-x64 
-
-$source = (Convert-Path .) + "\..\Source\MQTTnet.Server\bin\Release\netcoreapp3.1\linux-x64\publish"
-$destination = (Convert-Path .) + "\..\Source\MQTTnet.Server\bin\MQTTnet.Server-Linux-x64-v$nugetVersion.zip"
-If(Test-path $destination) {Remove-item $destination}
- Add-Type -assembly "system.io.compression.filesystem"
-[io.compression.zipfile]::CreateFromDirectory($source, $destination) 
-
-####################################################################
-
-# Build MQTTnet.Server Linux-ARM
-&dotnet publish ..\Source\MQTTnet.Server\MQTTnet.Server.csproj --configuration Release /p:FileVersion=$assemblyVersion /p:Version=$nugetVersion --self-contained --runtime linux-arm 
-
-$source = (Convert-Path .) + "\..\Source\MQTTnet.Server\bin\Release\netcoreapp3.1\linux-ARM\publish"
-$destination = (Convert-Path .) + "\..\Source\MQTTnet.Server\bin\MQTTnet.Server-Linux-ARM-v$nugetVersion.zip"
-If(Test-path $destination) {Remove-item $destination}
- Add-Type -assembly "system.io.compression.filesystem"
-[io.compression.zipfile]::CreateFromDirectory($source, $destination) 
-
-####################################################################
-
-# Build MQTTnet.Server Windows-x64
-&dotnet publish ..\Source\MQTTnet.Server\MQTTnet.Server.csproj --configuration Release /p:FileVersion=$assemblyVersion /p:Version=$nugetVersion --self-contained --runtime win-x64
-
-$source = (Convert-Path .) + "\..\Source\MQTTnet.Server\bin\Release\netcoreapp3.1\win-x64\publish"
-$destination = (Convert-Path .) + "\..\Source\MQTTnet.Server\bin\MQTTnet.Server-Windows-x64-v$nugetVersion.zip"
-If(Test-path $destination) {Remove-item $destination}
- Add-Type -assembly "system.io.compression.filesystem"
-[io.compression.zipfile]::CreateFromDirectory($source, $destination) 
-
-####################################################################

Build/upload.ps1

@@ -1,13 +0,0 @@
-param([string]$apiKey)
-
-Invoke-WebRequest -Uri "https://dist.nuget.org/win-x86-commandline/latest/nuget.exe" -OutFile "nuget.exe"
-
-$files = Get-ChildItem -Path ".\NuGet" -Filter "*.nupkg"
-foreach ($file in $files)
-{
-	Write-Host "Uploading: " $file
-
-	.\nuget.exe push $file.Fullname $apiKey -Source https://api.nuget.org/v3/index.json
-}
-
-Remove-Item "nuget.exe" -Force -Recurse -ErrorAction SilentlyContinue

CODE-OF-CONDUCT.md

@@ -0,0 +1,6 @@
+# Code of Conduct
+
+This project has adopted the code of conduct defined by the Contributor Covenant
+to clarify expected behavior in our community.
+
+For more information, see the [.NET Foundation Code of Conduct](https://dotnetfoundation.org/code-of-conduct).

Documents/Import_CodeSigningKey.md

@@ -1,9 +0,0 @@
-# Import codeSigningKey.pfx
-In order to import the key for code signing on a new developer machine use the following command within the VS developer command line:
-
-sn –i .\codeSigningKey.pfx VS_KEY_62CA73019ED23333
-
-The container name may be different.
-
-# Check if the assembly has a strong name
-sn -vf MQTTnet.dll

LICENSE

@@ -1,6 +1,7 @@
-MIT License
+The MIT License (MIT)
 
-Copyright (c) 2016-2019 Christian Kratky
+Copyright (c) .NET Foundation and Contributors
+All Rights Reserved
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

MQTTnet.noUWP.sln

@@ -1,260 +0,0 @@
-
-Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.27004.2010
-MinimumVisualStudioVersion = 10.0.40219.1
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Tests", "Tests", "{9248C2E1-B9D6-40BF-81EC-86004D7765B4}"
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Source", "Source", "{32A630A7-2598-41D7-B625-204CD906F5FB}"
-EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MQTTnet", "Source\MQTTnet\MQTTnet.csproj", "{3587E506-55A2-4EB3-99C7-DC01E42D25D2}"
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Build", "Build", "{67C28AC1-BC3A-420A-BE9C-FA2401431CF9}"
-	ProjectSection(SolutionItems) = preProject
-		Build\build.ps1 = Build\build.ps1
-		Build\MQTTnet.AspNetCore.nuspec = Build\MQTTnet.AspNetCore.nuspec
-		Build\MQTTnet.Extensions.ManagedClient.nuspec = Build\MQTTnet.Extensions.ManagedClient.nuspec
-		Build\MQTTnet.Extensions.Rpc.nuspec = Build\MQTTnet.Extensions.Rpc.nuspec
-		Build\MQTTnet.nuspec = Build\MQTTnet.nuspec
-		Build\upload.ps1 = Build\upload.ps1
-	EndProjectSection
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{B3F60ECB-45BA-4C66-8903-8BB89CA67998}"
-	ProjectSection(SolutionItems) = preProject
-		.bettercodehub.yml = .bettercodehub.yml
-		appveyor.yml = appveyor.yml
-		LICENSE = LICENSE
-		README.md = README.md
-	EndProjectSection
-EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MQTTnet.TestApp.NetCore", "Tests\MQTTnet.TestApp.NetCore\MQTTnet.TestApp.NetCore.csproj", "{3D283AAD-AAA8-4339-8394-52F80B6304DB}"
-EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MQTTnet.TestApp.AspNetCore2", "Tests\MQTTnet.TestApp.AspNetCore2\MQTTnet.TestApp.AspNetCore2.csproj", "{C6FF8AEA-0855-41EC-A1F3-AC262225BAB9}"
-EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MQTTnet.AspNetCore", "Source\MQTTnet.AspnetCore\MQTTnet.AspNetCore.csproj", "{F10C4060-F7EE-4A83-919F-FF723E72F94A}"
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Extensions", "Extensions", "{12816BCC-AF9E-44A9-9AE5-C246AF2A0587}"
-EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MQTTnet.Extensions.Rpc", "Source\MQTTnet.Extensions.Rpc\MQTTnet.Extensions.Rpc.csproj", "{C444E9C8-95FA-430E-9126-274129DE16CD}"
-EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MQTTnet.Benchmarks", "Tests\MQTTnet.Benchmarks\MQTTnet.Benchmarks.csproj", "{998D04DD-7CB0-45F5-A393-E2495C16399E}"
-EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MQTTnet.Extensions.ManagedClient", "Source\MQTTnet.Extensions.ManagedClient\MQTTnet.Extensions.ManagedClient.csproj", "{C400533A-8EBA-4F0B-BF4D-295C3708604B}"
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README.md

@@ -1,32 +1,31 @@
 <p align="center">
-<img src="https://github.com/chkr1011/MQTTnet/blob/master/Images/icon_det_256.png?raw=true" width="196">
-<br/>
+<img src="https://github.com/dotnet/MQTTnet/blob/master/Images/icon_det_256.png?raw=true" width="196">
 <br/>
 </p>
 
 [![NuGet Badge](https://buildstats.info/nuget/MQTTnet)](https://www.nuget.org/packages/MQTTnet)
-[![Build status](https://ci.appveyor.com/api/projects/status/ycit86voxfevm2aa/branch/master?svg=true)](https://ci.appveyor.com/project/chkr1011/mqttnet)
-[![BCH compliance](https://bettercodehub.com/edge/badge/chkr1011/MQTTnet?branch=master)](https://bettercodehub.com/)
+[![CI](https://github.com/dotnet/MQTTnet/actions/workflows/ci.yml/badge.svg)](https://github.com/dotnet/MQTTnet/actions/workflows/ci.yml)
+[![MyGet](https://img.shields.io/myget/mqttnet/v/mqttnet?color=orange&label=MyGet-Preview)](https://www.myget.org/feed/mqttnet/package/nuget/MQTTnet)
+![Size](https://img.shields.io/github/repo-size/dotnet/MQTTnet.svg)
 [![Join the chat at https://gitter.im/MQTTnet/community](https://badges.gitter.im/MQTTnet/community.svg)](https://gitter.im/MQTTnet/community?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
-[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://raw.githubusercontent.com/chkr1011/MQTTnet/master/LICENSE)
+[![License: MIT](https://img.shields.io/badge/License-MIT-green.svg)](https://raw.githubusercontent.com/dotnet/MQTTnet/master/LICENSE)
 
 # MQTTnet
 
-MQTTnet is a high performance .NET library for MQTT based communication. It provides a MQTT client and a MQTT server (broker). The implementation is based on the documentation from <http://mqtt.org/>.
+MQTTnet is a high performance .NET library for MQTT based communication. It provides a MQTT client and a MQTT server (broker) and supports the MQTT protocol up to version 5.
 
 ## Features
 
 ### General
 
 * Async support
-* TLS 1.2 support for client and server (but not UWP servers)
+* TLS support for client and server (but not UWP servers)
 * Extensible communication channels (e.g. In-Memory, TCP, TCP+TLS, WS)
 * Lightweight (only the low level implementation of MQTT, no overhead)
-* Performance optimized (processing ~70.000 messages / second)*
+* Performance optimized (processing ~150.000 messages / second)*
 * Uniform API across all supported versions of the MQTT protocol
-* Interfaces included for mocking and testing
 * Access to internal trace messages
-* Unit tested (~250 tests)
+* Unit tested (~636 tests)
 * No external dependencies
 
 \* Tested on local machine (Intel i7 8700K) with MQTTnet client and server running in the same process using the TCP channel. The app for verification is part of this repository and stored in _/Tests/MQTTnet.TestApp.NetCore_.
@@ -50,83 +49,45 @@ MQTTnet is a high performance .NET library for MQTT based communication. It prov
 * WebSockets supported (via ASP.NET Core 2.0, separate nuget)
 * A custom message interceptor can be added which allows transforming or extending every received application message
 * Validate subscriptions and deny subscribing of certain topics depending on requesting clients
-* Connect clients with different protocol versions at the same time.
-
-## MQTTnet Server
-
-_MQTTnet Server_ is a standalone cross platform MQTT server (like mosquitto) basing on this library. It has the following features.
-* Running portable (no installation required)
-* Runs und Windows, Linux, macOS, Raspberry Pi
-* Python scripting support for manipulating messages, validation of clients, building business logic etc.
-* Supports WebSocket and TCP (with and without TLS) connections
-* Provides a HTTP based API (including Swagger endpoint)
-* Extensive configuration parameters and customization supported
 
 ## Supported frameworks
 
-* .NET Standard 1.3+
-* .NET Core 1.1+
-* .NET Core App 1.1+
-* .NET Framework 4.5.2+ (x86, x64, AnyCPU)
-* Mono 5.2+
-* Universal Windows Platform (UWP) 10.0.10240+ (x86, x64, ARM, AnyCPU, Windows 10 IoT Core)
-* Xamarin.Android 7.5+
-* Xamarin.iOS 10.14+
-* Blazor WebAssembly 3.2.0
-
-## Supported MQTT versions
-
-* 5.0.0
-* 3.1.1
-* 3.1.0
-
-## Nuget
-
-This library is available as a nuget package: <https://www.nuget.org/packages/MQTTnet/>
-
-## Examples
-
-Please find examples and the documentation at the Wiki of this repository (<https://github.com/chkr1011/MQTTnet/wiki>).
-
-## Contributions
-
-If you want to contribute to this project just create a pull request. But only pull requests which are matching the code style of this library will be accepted. Before creating a pull request please have a look at the library to get an overview of the required style.
-Also additions and updates in the Wiki are welcome.
+| Framwork           | Version     |
+| ------------------ | ----------- |
+|.NET                | 5.0+        |
+|.NET Framework      | 4.5.2+      |
+|.NET Standard       | 1.3+        |
+|.NET Core           | 1.1+        |
+|.NET Core App       | 1.1+        |
+| Mono               | 5.2+        |
+| UWP                | 10.0.10240+ |
+| Xamarin.Android    | 7.5+        |
+| Xamarin.iOS        | 10.14+      |
+| Blazor WebAssembly | 3.2.0+      |
 
 ## References
 
 This library is used in the following projects:
 
-* Azure Functions MQTT Bindings, [CaseOnline.Azure.WebJobs.Extensions.Mqtt](https://github.com/keesschollaart81/CaseOnline.Azure.WebJobs.Extensions.Mqtt/)
+* Azure Functions MQTT Bindings, <https://github.com/keesschollaart81/CaseOnline.Azure.WebJobs.Extensions.Mqtt>)
 * HA4IoT (Open Source Home Automation system for .NET, <https://github.com/chkr1011/HA4IoT>)
 * MQTT Client Rx (Wrapper for Reactive Extensions, <https://github.com/1iveowl/MQTTClient.rx>)
+* MQTT Client Rx (Managed Client Wrapper for Reactive Extensions, <https://github.com/mmuecke/RxMQTTnet>)
 * MQTT Tester (MQTT client test app for [Android](https://play.google.com/store/apps/details?id=com.liveowl.mqtttester) and [iOS](https://itunes.apple.com/us/app/mqtt-tester/id1278621826?mt=8))
+* MQTTnet App (Cross platform client application for MQTT debugging, inspection etc., <https://github.com/chkr1011/MQTTnetApp>)
 * Wirehome.Core (Open Source Home Automation system for .NET Core, <https://github.com/chkr1011/Wirehome.Core>)
+* SparkplugNet (Sparkplug library for .Net, <https://github.com/SeppPenner/SparkplugNet>)
+* Silverback (Framework to build event-driven applications - support for MQTT, Kafka & RabbitMQ) <https://github.com/BEagle1984/silverback>
 
-Further projects using this project can be found under https://github.com/chkr1011/MQTTnet/network/dependents.
+Further projects using this project can be found under https://github.com/dotnet/MQTTnet/network/dependents.
 
 If you use this library and want to see your project here please create a pull request.
 
-## License
+## Code of Conduct
 
-MIT License
+This project has adopted the code of conduct defined by the Contributor Covenant to clarify expected behavior in our community.
+For more information see the [.NET Foundation Code of Conduct](https://dotnetfoundation.org/code-of-conduct).
 
-MQTTnet Copyright (c) 2016-2020 Christian Kratky
+## .NET Foundation
 
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+This project is supported by the [.NET Foundation](https://dotnetfoundation.org).

Samples/Client/Client_Connection_Samples.cs

@@ -0,0 +1,348 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+// ReSharper disable UnusedType.Global
+// ReSharper disable UnusedMember.Global
+// ReSharper disable InconsistentNaming
+
+using System.Security.Authentication;
+using MQTTnet.Client;
+using MQTTnet.Extensions.WebSocket4Net;
+using MQTTnet.Formatter;
+using MQTTnet.Samples.Shared;
+
+namespace MQTTnet.Samples.Client;
+
+public static class Client_Connection_Samples
+{
+    public static async Task Connect_Client()
+    {
+        /*
+         * This sample creates a simple MQTT client and connects to a public broker.
+         *
+         * Always dispose the client when it is no longer used.
+         * The default version of MQTT is 3.1.1.
+         */
+
+        var mqttFactory = new MqttFactory();
+
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            // Use builder classes where possible in this project.
+            var mqttClientOptions = new MqttClientOptionsBuilder().WithTcpServer("broker.hivemq.com").Build();
+
+            // This will throw an exception if the server is not available.
+            // The result from this message returns additional data which was sent 
+            // from the server. Please refer to the MQTT protocol specification for details.
+            var response = await mqttClient.ConnectAsync(mqttClientOptions, CancellationToken.None);
+
+            Console.WriteLine("The MQTT client is connected.");
+
+            response.DumpToConsole();
+
+            // Send a clean disconnect to the server by calling _DisconnectAsync_. Without this the TCP connection
+            // gets dropped and the server will handle this as a non clean disconnect (see MQTT spec for details).
+            var mqttClientDisconnectOptions = mqttFactory.CreateClientDisconnectOptionsBuilder().Build();
+
+            await mqttClient.DisconnectAsync(mqttClientDisconnectOptions, CancellationToken.None);
+        }
+    }
+
+    public static async Task Connect_Client_Timeout()
+    {
+        /*
+         * This sample creates a simple MQTT client and connects to an invalid broker using a timeout.
+         * 
+         * This is a modified version of the sample _Connect_Client_! See other sample for more details.
+         */
+
+        var mqttFactory = new MqttFactory();
+
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            var mqttClientOptions = new MqttClientOptionsBuilder().WithTcpServer("127.0.0.1").Build();
+
+            try
+            {
+                using (var timeoutToken = new CancellationTokenSource(TimeSpan.FromSeconds(1)))
+                {
+                    await mqttClient.ConnectAsync(mqttClientOptions, timeoutToken.Token);
+                }
+            }
+            catch (OperationCanceledException)
+            {
+                Console.WriteLine("Timeout while connecting.");
+            }
+        }
+    }
+
+    public static async Task Connect_Client_Using_MQTTv5()
+    {
+        /*
+         * This sample creates a simple MQTT client and connects to a public broker using MQTTv5.
+         * 
+         * This is a modified version of the sample _Connect_Client_! See other sample for more details.
+         */
+
+        var mqttFactory = new MqttFactory();
+
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            var mqttClientOptions = new MqttClientOptionsBuilder().WithTcpServer("broker.hivemq.com").WithProtocolVersion(MqttProtocolVersion.V500).Build();
+
+            // In MQTTv5 the response contains much more information.
+            var response = await mqttClient.ConnectAsync(mqttClientOptions, CancellationToken.None);
+
+            Console.WriteLine("The MQTT client is connected.");
+
+            response.DumpToConsole();
+        }
+    }
+
+    public static async Task Connect_Client_Using_TLS_1_2()
+    {
+        /*
+         * This sample creates a simple MQTT client and connects to a public broker using TLS 1.2 encryption.
+         * 
+         * This is a modified version of the sample _Connect_Client_! See other sample for more details.
+         */
+
+        var mqttFactory = new MqttFactory();
+
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            var mqttClientOptions = new MqttClientOptionsBuilder().WithTcpServer("mqtt.fluux.io")
+                .WithTls(
+                    o =>
+                    {
+                        // The used public broker sometimes has invalid certificates. This sample accepts all
+                        // certificates. This should not be used in live environments.
+                        o.CertificateValidationHandler = _ => true;
+                        
+                        // The default value is determined by the OS. Set manually to force version.
+                        o.SslProtocol = SslProtocols.Tls12;
+                    })
+                .Build();
+
+            using (var timeout = new CancellationTokenSource(5000))
+            {
+                await mqttClient.ConnectAsync(mqttClientOptions, timeout.Token);
+
+                Console.WriteLine("The MQTT client is connected.");
+            }
+        }
+    }
+
+    public static async Task Connect_Client_Using_WebSockets()
+    {
+        /*
+         * This sample creates a simple MQTT client and connects to a public broker using a WebSocket connection.
+         * 
+         * This is a modified version of the sample _Connect_Client_! See other sample for more details.
+         */
+
+        var mqttFactory = new MqttFactory();
+
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            var mqttClientOptions = new MqttClientOptionsBuilder().WithWebSocketServer("broker.hivemq.com:8000/mqtt").Build();
+
+            var response = await mqttClient.ConnectAsync(mqttClientOptions, CancellationToken.None);
+
+            Console.WriteLine("The MQTT client is connected.");
+
+            response.DumpToConsole();
+        }
+    }
+    
+    public static async Task Connect_Client_Using_WebSocket4Net()
+    {
+        /*
+         * This sample creates a simple MQTT client and connects to a public broker using a WebSocket connection.
+         * Instead of the .NET implementation of WebSockets the implementaion from WebSocket4Net is used. It provides more
+         * encryption algorithms and supports more platforms.
+         * 
+         * This is a modified version of the sample _Connect_Client_! See other sample for more details.
+         */
+
+        var mqttFactory = new MqttFactory().UseWebSocket4Net();
+
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            var mqttClientOptions = new MqttClientOptionsBuilder().WithWebSocketServer("broker.hivemq.com:8000/mqtt").Build();
+
+            var response = await mqttClient.ConnectAsync(mqttClientOptions, CancellationToken.None);
+
+            Console.WriteLine("The MQTT client is connected.");
+
+            response.DumpToConsole();
+        }
+    }
+
+    public static async Task Connect_Client_With_TLS_Encryption()
+    {
+        /*
+         * This sample creates a simple MQTT client and connects to a public broker with enabled TLS encryption.
+         * 
+         * This is a modified version of the sample _Connect_Client_! See other sample for more details.
+         */
+
+        var mqttFactory = new MqttFactory();
+
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            var mqttClientOptions = new MqttClientOptionsBuilder().WithTcpServer("test.mosquitto.org", 8883)
+                .WithTls(
+                    o =>
+                    {
+                        // The used public broker sometimes has invalid certificates. This sample accepts all
+                        // certificates. This should not be used in live environments.
+                        o.CertificateValidationHandler = _ => true;
+                    })
+                .Build();
+
+            // In MQTTv5 the response contains much more information.
+            using (var timeout = new CancellationTokenSource(5000))
+            {
+                var response = await mqttClient.ConnectAsync(mqttClientOptions, timeout.Token);
+                
+                Console.WriteLine("The MQTT client is connected.");
+
+                response.DumpToConsole();
+            }
+        }
+    }
+
+    public static async Task Inspect_Certificate_Validation_Errors()
+    {
+        /*
+         * This sample prints the certificate information while connection. This data can be used to decide whether a connection is secure or not
+         * including the reason for that status.
+         */
+
+        var mqttFactory = new MqttFactory();
+
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            var mqttClientOptions = new MqttClientOptionsBuilder().WithTcpServer("mqtt.fluux.io", 8883)
+                .WithTls(
+                    o =>
+                    {
+                        o.CertificateValidationHandler = eventArgs =>
+                        {
+                            eventArgs.Certificate.Subject.DumpToConsole();
+                            eventArgs.Certificate.GetExpirationDateString().DumpToConsole();
+                            eventArgs.Chain.ChainPolicy.RevocationMode.DumpToConsole();
+                            eventArgs.Chain.ChainStatus.DumpToConsole();
+                            eventArgs.SslPolicyErrors.DumpToConsole();
+                            return true;
+                        };
+                    })
+                .Build();
+
+            // In MQTTv5 the response contains much more information.
+            using (var timeout = new CancellationTokenSource(5000))
+            {
+                await mqttClient.ConnectAsync(mqttClientOptions, timeout.Token);
+            }
+        }
+    }
+    
+    public static async Task Ping_Server()
+    {
+        /*
+         * This sample sends a PINGREQ packet to the server and waits for a reply.
+         *
+         * This is only supported in METTv5.0.0+.
+         */
+
+        var mqttFactory = new MqttFactory();
+
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            var mqttClientOptions = new MqttClientOptionsBuilder().WithTcpServer("broker.hivemq.com").Build();
+
+            await mqttClient.ConnectAsync(mqttClientOptions, CancellationToken.None);
+
+            // This will throw an exception if the server does not reply.
+            await mqttClient.PingAsync(CancellationToken.None);
+
+            Console.WriteLine("The MQTT server replied to the ping request.");
+        }
+    }
+
+    public static async Task Reconnect_Using_Event()
+    {
+        /*
+         * This sample shows how to reconnect when the connection was dropped.
+         * This approach uses one of the events from the client.
+         * This approach has a risk of dead locks! Consider using the timer approach (see sample).
+         */
+
+        var mqttFactory = new MqttFactory();
+
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            var mqttClientOptions = new MqttClientOptionsBuilder().WithTcpServer("broker.hivemq.com").Build();
+
+            mqttClient.DisconnectedAsync += async e =>
+            {
+                if (e.ClientWasConnected)
+                {
+                    // Use the current options as the new options.
+                    await mqttClient.ConnectAsync(mqttClient.Options);
+                }
+            };
+
+            await mqttClient.ConnectAsync(mqttClientOptions, CancellationToken.None);
+        }
+    }
+
+    public static void Reconnect_Using_Timer()
+    {
+        /*
+         * This sample shows how to reconnect when the connection was dropped.
+         * This approach uses a custom Task/Thread which will monitor the connection status.
+         * This is the recommended way but requires more custom code!
+         */
+
+        var mqttFactory = new MqttFactory();
+
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            var mqttClientOptions = new MqttClientOptionsBuilder().WithTcpServer("broker.hivemq.com").Build();
+
+            _ = Task.Run(
+                async () =>
+                {
+                    // User proper cancellation and no while(true).
+                    while (true)
+                    {
+                        try
+                        {
+                            // This code will also do the very first connect! So no call to _ConnectAsync_ is required
+                            // in the first place.
+                            if (!mqttClient.IsConnected)
+                            {
+                                await mqttClient.ConnectAsync(mqttClientOptions, CancellationToken.None);
+
+                                // Subscribe to topics when session is clean etc.
+
+                                Console.WriteLine("The MQTT client is connected.");
+                            }
+                        }
+                        catch
+                        {
+                            // Handle the exception properly (logging etc.).
+                        }
+                        finally
+                        {
+                            // Check the connection state every 5 seconds and perform a reconnect if required.
+                            await Task.Delay(TimeSpan.FromSeconds(5));
+                        }
+                    }
+                });
+        }
+    }
+}

Samples/Client/Client_Publish_Samples.cs

@@ -0,0 +1,46 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+// ReSharper disable UnusedType.Global
+// ReSharper disable UnusedMember.Global
+// ReSharper disable InconsistentNaming
+
+using MQTTnet.Client;
+
+namespace MQTTnet.Samples.Client;
+
+public static class Client_Publish_Samples
+{
+    public static async Task Publish_Application_Message()
+    {
+        /*
+         * This sample pushes a simple application message including a topic and a payload.
+         *
+         * Always use builders where they exist. Builders (in this project) are designed to be
+         * backward compatible. Creating an _MqttApplicationMessage_ via its constructor is also
+         * supported but the class might change often in future releases where the builder does not
+         * or at least provides backward compatibility where possible.
+         */
+
+        var mqttFactory = new MqttFactory();
+
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            var mqttClientOptions = new MqttClientOptionsBuilder()
+                .WithTcpServer("broker.hivemq.com")
+                .Build();
+
+            await mqttClient.ConnectAsync(mqttClientOptions, CancellationToken.None);
+
+            var applicationMessage = new MqttApplicationMessageBuilder()
+                .WithTopic("samples/temperature/living_room")
+                .WithPayload("19.5")
+                .Build();
+
+            await mqttClient.PublishAsync(applicationMessage, CancellationToken.None);
+
+            Console.WriteLine("MQTT application message is published.");
+        }
+    }
+}

Samples/Client/Client_Subscribe_Samples.cs

@@ -0,0 +1,84 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+// ReSharper disable UnusedType.Global
+// ReSharper disable UnusedMember.Global
+// ReSharper disable InconsistentNaming
+
+using MQTTnet.Client;
+using MQTTnet.Samples.Shared;
+
+namespace MQTTnet.Samples.Client;
+
+public static class Client_Subscribe_Samples
+{
+    public static async Task Handle_Received_Application_Message()
+    {
+        /*
+         * This sample subscribes to a topic and processes the received message.
+         */
+
+        var mqttFactory = new MqttFactory();
+
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            var mqttClientOptions = new MqttClientOptionsBuilder()
+                .WithTcpServer("broker.hivemq.com")
+                .Build();
+
+            // Setup message handling before connecting so that queued messages
+            // are also handled properly. When there is no event handler attached all
+            // received messages get lost.
+            mqttClient.ApplicationMessageReceivedAsync += e =>
+            {
+                Console.WriteLine("Received application message.");
+                e.DumpToConsole();
+
+                return Task.CompletedTask;
+            };
+
+            await mqttClient.ConnectAsync(mqttClientOptions, CancellationToken.None);
+
+            var mqttSubscribeOptions = mqttFactory.CreateSubscribeOptionsBuilder()
+                .WithTopicFilter(f => { f.WithTopic("mqttnet/samples/topic/2"); })
+                .Build();
+
+            await mqttClient.SubscribeAsync(mqttSubscribeOptions, CancellationToken.None);
+
+            Console.WriteLine("MQTT client subscribed to topic.");
+
+            Console.WriteLine("Press enter to exit.");
+            Console.ReadLine();
+        }
+    }
+
+    public static async Task Subscribe_Topic()
+    {
+        /*
+         * This sample subscribes to a topic.
+         */
+
+        var mqttFactory = new MqttFactory();
+
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            var mqttClientOptions = new MqttClientOptionsBuilder()
+                .WithTcpServer("broker.hivemq.com")
+                .Build();
+
+            await mqttClient.ConnectAsync(mqttClientOptions, CancellationToken.None);
+
+            var mqttSubscribeOptions = mqttFactory.CreateSubscribeOptionsBuilder()
+                .WithTopicFilter(f => { f.WithTopic("mqttnet/samples/topic/1"); })
+                .Build();
+
+            var response = await mqttClient.SubscribeAsync(mqttSubscribeOptions, CancellationToken.None);
+
+            Console.WriteLine("MQTT client subscribed to topic.");
+
+            // The response contains additional data sent by the server after subscribing.
+            response.DumpToConsole();
+        }
+    }
+}

Samples/Diagnostics/Logger_Samples.cs

@@ -0,0 +1,109 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+// ReSharper disable UnusedType.Global
+// ReSharper disable UnusedMember.Global
+// ReSharper disable InconsistentNaming
+
+using System.Text;
+using MQTTnet.Diagnostics;
+using MQTTnet.Samples.Shared;
+
+namespace MQTTnet.Samples.Diagnostics;
+
+public static class Logger_Samples
+{
+    public static async Task Create_Custom_Logger()
+    {
+        /*
+         * This sample covers the creation of a custom logger which can be used to forward MQTTnet log messages
+         * to other loggers like Microsoft logger or Serilog or log4net etc.
+         */
+
+        var mqttFactory = new MqttFactory(new MyLogger());
+
+        var mqttClientOptions = mqttFactory.CreateClientOptionsBuilder().WithTcpServer("broker.hivemq.com").Build();
+
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            await mqttClient.ConnectAsync(mqttClientOptions, CancellationToken.None);
+
+            Console.WriteLine("MQTT client is connected.");
+
+            var mqttClientDisconnectOptions = mqttFactory.CreateClientDisconnectOptionsBuilder().Build();
+
+            await mqttClient.DisconnectAsync(mqttClientDisconnectOptions, CancellationToken.None);
+        }
+    }
+
+    public static async Task Log_To_Console()
+    {
+        /*
+       * This sample covers the creation of a custom logger which is used to log to the console.
+       */
+
+        var mqttFactory = new MqttFactory(new ConsoleLogger());
+
+        var mqttClientOptions = mqttFactory.CreateClientOptionsBuilder().WithTcpServer("broker.hivemq.com").Build();
+
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            await mqttClient.ConnectAsync(mqttClientOptions, CancellationToken.None);
+
+            Console.WriteLine("MQTT client is connected. Press any key to exit.");
+            Console.ReadKey(true);
+        }
+    }
+
+    public static async Task Use_Event_Logger()
+    {
+        /*
+         * This sample shows how to get logs from the library.
+         *
+         * ATTENTION: Only use the logger for debugging etc. The performance is heavily decreased when a logger is used.
+         */
+
+        // The logger ID is optional but can be set do distinguish different logger instances.
+        var mqttEventLogger = new MqttNetEventLogger("MyCustomLogger");
+
+        mqttEventLogger.LogMessagePublished += (sender, args) =>
+        {
+            var output = new StringBuilder();
+            output.AppendLine($">> [{args.LogMessage.Timestamp:O}] [{args.LogMessage.ThreadId}] [{args.LogMessage.Source}] [{args.LogMessage.Level}]: {args.LogMessage.Message}");
+            if (args.LogMessage.Exception != null)
+            {
+                output.AppendLine(args.LogMessage.Exception.ToString());
+            }
+
+            Console.Write(output);
+        };
+
+        var mqttFactory = new MqttFactory(mqttEventLogger);
+
+        var mqttClientOptions = mqttFactory.CreateClientOptionsBuilder().WithTcpServer("broker.hivemq.com").Build();
+
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            await mqttClient.ConnectAsync(mqttClientOptions, CancellationToken.None);
+
+            Console.WriteLine("MQTT client is connected.");
+
+            var mqttClientDisconnectOptions = mqttFactory.CreateClientDisconnectOptionsBuilder().Build();
+
+            await mqttClient.DisconnectAsync(mqttClientDisconnectOptions, CancellationToken.None);
+        }
+    }
+
+    sealed class MyLogger : IMqttNetLogger
+    {
+        public bool IsEnabled { get; } = true;
+
+        public void Publish(MqttNetLogLevel logLevel, string source, string message, object[] parameters, Exception exception)
+        {
+            // Forward the log message to other loggers.
+            // 1. Convert log level to matching log level in target logger.
+            // 2. Call target logger and pass data accordingly.
+        }
+    }
+}

Samples/Diagnostics/PackageInspection_Samples.cs

@@ -0,0 +1,55 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+// ReSharper disable UnusedType.Global
+// ReSharper disable UnusedMember.Global
+// ReSharper disable InconsistentNaming
+
+using MQTTnet.Diagnostics;
+
+namespace MQTTnet.Samples.Diagnostics;
+
+public static class PackageInspection_Samples
+{
+    public static async Task Inspect_Outgoing_Package()
+    {
+        /*
+         * This sample covers the inspection of outgoing packages from the client.
+         */
+        
+        var mqttFactory = new MqttFactory();
+        
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            var mqttClientOptions = mqttFactory.CreateClientOptionsBuilder()
+                .WithTcpServer("broker.hivemq.com")
+                .Build();
+            
+            mqttClient.InspectPackage += OnInspectPackage;
+            
+            await mqttClient.ConnectAsync(mqttClientOptions, CancellationToken.None);
+            
+            Console.WriteLine("MQTT client is connected.");
+
+            var mqttClientDisconnectOptions = mqttFactory.CreateClientDisconnectOptionsBuilder()
+                .Build();
+
+            await mqttClient.DisconnectAsync(mqttClientDisconnectOptions, CancellationToken.None);
+        }
+    }
+
+    static Task OnInspectPackage(InspectMqttPacketEventArgs eventArgs)
+    {
+        if (eventArgs.Direction == MqttPacketFlowDirection.Inbound)
+        {
+            Console.WriteLine($"IN: {Convert.ToBase64String(eventArgs.Buffer)}");
+        }
+        else
+        {
+            Console.WriteLine($"OUT: {Convert.ToBase64String(eventArgs.Buffer)}");
+        }
+
+        return Task.CompletedTask;
+    }
+}

Samples/MQTTnet.Samples.csproj

@@ -0,0 +1,26 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net6.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <IsPackable>false</IsPackable>
+        <DisableImplicitAspNetCoreAnalyzers>true</DisableImplicitAspNetCoreAnalyzers>
+        <EnableNETAnalyzers>false</EnableNETAnalyzers>
+        <EnforceCodeStyleInBuild>false</EnforceCodeStyleInBuild>
+        <NoWarn>1591</NoWarn>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Microsoft.CodeAnalysis.Compilers" Version="4.0.1" />
+        <PackageReference Include="Microsoft.Net.Compilers" Version="4.0.1" />
+
+        <ProjectReference Include="..\Source\MQTTnet.AspnetCore\MQTTnet.AspNetCore.csproj" />
+        <ProjectReference Include="..\Source\MQTTnet.Extensions.ManagedClient\MQTTnet.Extensions.ManagedClient.csproj" />
+        <ProjectReference Include="..\Source\MQTTnet.Extensions.Rpc\MQTTnet.Extensions.Rpc.csproj" />
+        <ProjectReference Include="..\Source\MQTTnet.Extensions.WebSocket4Net\MQTTnet.Extensions.WebSocket4Net.csproj" />
+        <ProjectReference Include="..\Source\MQTTnet\MQTTnet.csproj" />
+    </ItemGroup>
+
+</Project>

Samples/ManagedClient/Managed_Client_Simple_Samples.cs

@@ -0,0 +1,52 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+// ReSharper disable UnusedType.Global
+// ReSharper disable UnusedMember.Global
+// ReSharper disable InconsistentNaming
+
+using MQTTnet.Client;
+using MQTTnet.Extensions.ManagedClient;
+
+namespace MQTTnet.Samples.ManagedClient;
+
+public sealed class Managed_Client_Simple_Samples
+{
+    public static async Task Connect_Client()
+    {
+        /*
+         * This sample creates a simple managed MQTT client and connects to a public broker.
+         *
+         * The managed client extends the existing _MqttClient_. It adds the following features.
+         * - Reconnecting when connection is lost.
+         * - Storing pending messages in an internal queue so that an enqueue is possible while the client remains not connected.
+         */
+        
+        var mqttFactory = new MqttFactory();
+
+        using (var managedMqttClient = mqttFactory.CreateManagedMqttClient())
+        {
+            var mqttClientOptions = new MqttClientOptionsBuilder()
+                .WithTcpServer("broker.hivemq.com")
+                .Build();
+
+            var managedMqttClientOptions = new ManagedMqttClientOptionsBuilder()
+                .WithClientOptions(mqttClientOptions)
+                .Build();
+
+            await managedMqttClient.StartAsync(managedMqttClientOptions);
+
+            // The application message is not sent. It is stored in an internal queue and
+            // will be sent when the client is connected.
+            await managedMqttClient.EnqueueAsync("Topic", "Payload");
+
+            Console.WriteLine("The managed MQTT client is connected.");
+            
+            // Wait until the queue is fully processed.
+            SpinWait.SpinUntil(() => managedMqttClient.PendingApplicationMessagesCount == 0, 10000);
+            
+            Console.WriteLine($"Pending messages = {managedMqttClient.PendingApplicationMessagesCount}");
+        }
+    }
+}

Samples/Program.cs

@@ -0,0 +1,55 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Reflection;
+
+Console.WriteLine("Welcome to MQTTnet samples!");
+Console.WriteLine();
+
+var sampleClasses = Assembly.GetExecutingAssembly().GetExportedTypes().OrderBy(c => c.Name).ToList();
+sampleClasses.RemoveAll(c => c.Namespace.Contains(".Shared"));
+
+var index = 0;
+foreach (var sampleClass in sampleClasses)
+{
+    Console.WriteLine($"{index} = {sampleClass.Name}");
+    index++;
+}
+
+Console.Write("Please choose sample class (press Enter to continue): ");
+var input = Console.ReadLine();
+var selectedIndex = int.Parse(input ?? "0");
+var selectedSampleClass = sampleClasses[selectedIndex];
+var sampleMethods = selectedSampleClass.GetMethods(BindingFlags.Static | BindingFlags.Public).OrderBy(m => m.Name).ToList();
+
+index = 0;
+foreach (var sampleMethod in sampleMethods)
+{
+    Console.WriteLine($"{index} = {sampleMethod.Name}");
+    index++;
+}
+
+Console.Write("Please choose sample (press Enter to continue): ");
+input = Console.ReadLine();
+selectedIndex = int.Parse(input ?? "0");
+var selectedSampleMethod = sampleMethods[selectedIndex];
+
+Console.WriteLine("Executing sample...");
+Console.WriteLine();
+
+try
+{
+    if (selectedSampleMethod.Invoke(null, null) is Task task)
+    {
+        await task;    
+    }
+}
+catch (Exception exception)
+{
+    Console.WriteLine(exception.ToString());
+}
+
+Console.WriteLine();
+Console.WriteLine("Press Enter to exit.");
+Console.ReadLine();

Samples/RpcClient/RpcClient_Samples.cs

@@ -0,0 +1,88 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+// ReSharper disable UnusedType.Global
+// ReSharper disable UnusedMember.Global
+// ReSharper disable InconsistentNaming
+
+using MQTTnet.Client;
+using MQTTnet.Extensions.Rpc;
+using MQTTnet.Protocol;
+
+namespace MQTTnet.Samples.RpcClient;
+
+public static class RpcClient_Samples
+{
+    /*
+     * The extension MQTTnet.Extensions.Rpc (available as nuget) allows sending a request and waiting for the matching reply.
+     * This is done via defining a pattern which uses the topic to correlate the request and the response.
+     * From client usage it is possible to define a timeout.
+     */
+    
+    public static async Task Send_Request()
+    {
+        var mqttFactory = new MqttFactory();
+        
+        // The RPC client is an addon for the existing client. So we need a regular client
+        // which is wrapped later.
+        
+        using (var mqttClient = mqttFactory.CreateMqttClient())
+        {
+            var mqttClientOptions = new MqttClientOptionsBuilder()
+                .WithTcpServer("broker.hivemq.com")
+                .Build();
+
+            await mqttClient.ConnectAsync(mqttClientOptions);
+            
+            using (var mqttRpcClient = mqttFactory.CreateMqttRpcClient(mqttClient))
+            {
+                // Access to a fully featured application message is not supported for RPC calls!
+                // The method will throw an exception when the response was not received in time.
+                await mqttRpcClient.ExecuteAsync(TimeSpan.FromSeconds(2), "ping", "", MqttQualityOfServiceLevel.AtMostOnce);
+            }
+            
+            Console.WriteLine("The RPC call was successful.");
+        }
+    }
+    
+    /*
+     * The device must respond to the request using the correct topic. The following C code shows how a
+     * smart device like an ESP8266 must respond to the above sample.
+     *
+        // If using the MQTT client PubSubClient it must be ensured 
+        // that the request topic for each method is subscribed like the following.
+        mqttClient.subscribe("MQTTnet.RPC/+/ping");
+        mqttClient.subscribe("MQTTnet.RPC/+/do_something");
+
+        // It is not allowed to change the structure of the topic.
+        // Otherwise RPC will not work.
+        // So method names can be separated using an _ or . but no +, # or /.
+        // If it is required to distinguish between devices
+        // own rules can be defined like the following:
+        mqttClient.subscribe("MQTTnet.RPC/+/deviceA.ping");
+        mqttClient.subscribe("MQTTnet.RPC/+/deviceB.ping");
+        mqttClient.subscribe("MQTTnet.RPC/+/deviceC.getTemperature");
+
+        // Within the callback of the MQTT client the topic must be checked
+        // if it belongs to MQTTnet RPC. The following code shows one
+        // possible way of doing this.
+        void mqtt_Callback(char *topic, byte *payload, unsigned int payloadLength)
+        {
+	        String topicString = String(topic);
+
+	        if (topicString.startsWith("MQTTnet.RPC/")) {
+		        String responseTopic = topicString + String("/response");
+
+		        if (topicString.endsWith("/deviceA.ping")) {
+			        mqtt_publish(responseTopic, "pong", false);
+			        return;
+		        }
+	        }
+        }
+
+        // Important notes:
+        // ! Do not send response message with the _retain_ flag set to true.
+        // ! All required data for a RPC call and the result must be placed into the payload.
+     */
+}

Samples/Server/Server_Asp_Net_Samples.cs

@@ -0,0 +1,110 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+// ReSharper disable UnusedType.Global
+// ReSharper disable UnusedMember.Global
+// ReSharper disable InconsistentNaming
+// ReSharper disable EmptyConstructor
+// ReSharper disable MemberCanBeMadeStatic.Local
+
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using MQTTnet.AspNetCore;
+using MQTTnet.Server;
+
+namespace MQTTnet.Samples.Server;
+
+public static class Server_Asp_Net_Samples
+{
+    public static Task Start_Server_With_WebSockets_Support()
+    {
+        /*
+         * This sample starts a minimal ASP.NET Webserver including a hosted MQTT server.
+         */
+        var host = Host.CreateDefaultBuilder(Array.Empty<string>())
+            .ConfigureWebHostDefaults(
+                webBuilder =>
+                {
+                    webBuilder.UseKestrel(
+                        o =>
+                        {
+                            // This will allow MQTT connections based on TCP port 1883.
+                            o.ListenAnyIP(1883, l => l.UseMqtt());
+
+                            // This will allow MQTT connections based on HTTP WebSockets with URI "localhost:5000/mqtt"
+                            // See code below for URI configuration.
+                            o.ListenAnyIP(5000); // Default HTTP pipeline
+                        });
+
+                    webBuilder.UseStartup<Startup>();
+                });
+
+        return host.RunConsoleAsync();
+    }
+
+    sealed class MqttController
+    {
+        public MqttController()
+        {
+            // Inject other services via constructor.
+        }
+        
+        public Task OnClientConnected(ClientConnectedEventArgs eventArgs)
+        {
+            Console.WriteLine($"Client '{eventArgs.ClientId}' connected.");
+            return Task.CompletedTask;
+        }
+
+
+        public Task ValidateConnection(ValidatingConnectionEventArgs eventArgs)
+        {
+            Console.WriteLine($"Client '{eventArgs.ClientId}' wants to connect. Accepting!");
+            return Task.CompletedTask;
+        }
+    }
+
+    sealed class Startup
+    {
+        public void Configure(IApplicationBuilder app, IWebHostEnvironment environment, MqttController mqttController)
+        {
+            app.UseRouting();
+
+            app.UseEndpoints(
+                endpoints =>
+                {
+                    endpoints.MapConnectionHandler<MqttConnectionHandler>(
+                        "/mqtt",
+                        httpConnectionDispatcherOptions => httpConnectionDispatcherOptions.WebSockets.SubProtocolSelector =
+                            protocolList => protocolList.FirstOrDefault() ?? string.Empty);
+                });
+
+            app.UseMqttServer(
+                server =>
+                {
+                    /*
+                     * Attach event handlers etc. if required.
+                     */
+
+                    server.ValidatingConnectionAsync += mqttController.ValidateConnection;
+                    server.ClientConnectedAsync += mqttController.OnClientConnected;
+                });
+        }
+
+        public void ConfigureServices(IServiceCollection services)
+        {
+            services.AddHostedMqttServer(
+                optionsBuilder =>
+                {
+                    optionsBuilder.WithDefaultEndpoint();
+                });
+
+            services.AddMqttConnectionHandler();
+            services.AddConnections();
+
+            services.AddSingleton<MqttController>();
+        }
+    }
+}

Samples/Server/Server_Retained_Messages_Samples.cs

@@ -0,0 +1,82 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+// ReSharper disable UnusedType.Global
+// ReSharper disable UnusedMember.Global
+// ReSharper disable InconsistentNaming
+
+using System.Text.Json;
+
+namespace MQTTnet.Samples.Server;
+
+public static class Server_Retained_Messages_Samples
+{
+    public static async Task Persist_Retained_Messages()
+    {
+        /*
+         * This sample starts a simple MQTT server which will store all retained messages in a file.
+         */
+
+        var storePath = Path.Combine(Path.GetTempPath(), "RetainedMessages.json");
+
+        var mqttFactory = new MqttFactory();
+
+        // Due to security reasons the "default" endpoint (which is unencrypted) is not enabled by default!
+        var mqttServerOptions = mqttFactory.CreateServerOptionsBuilder().WithDefaultEndpoint().Build();
+
+        using (var server = mqttFactory.CreateMqttServer(mqttServerOptions))
+        {
+            // Make sure that the server will load the retained messages.
+            server.LoadingRetainedMessageAsync += async eventArgs =>
+            {
+                try
+                {
+                    eventArgs.LoadedRetainedMessages = await JsonSerializer.DeserializeAsync<List<MqttApplicationMessage>>(File.OpenRead(storePath));
+                    Console.WriteLine("Retained messages loaded.");
+                }
+                catch (FileNotFoundException)
+                {
+                    // Ignore because nothing is stored yet.
+                    Console.WriteLine("No retained messages stored yet.");
+                }
+                catch (Exception exception)
+                {
+                    Console.WriteLine(exception);
+                }
+            };
+
+            // Make sure to persist the changed retained messages.
+            server.RetainedMessageChangedAsync += async eventArgs =>
+            {
+                try
+                {
+                    // This sample uses the property _StoredRetainedMessages_ which will contain all(!) retained messages.
+                    // The event args also contain the affected retained message (property ChangedRetainedMessage). This can be
+                    // used to write all retained messages to dedicated files etc. Then all files must be loaded and a full list
+                    // of retained messages must be provided in the loaded event.
+
+                    var buffer = JsonSerializer.SerializeToUtf8Bytes(eventArgs.StoredRetainedMessages);
+                    await File.WriteAllBytesAsync(storePath, buffer);
+                    Console.WriteLine("Retained messages saved.");
+                }
+                catch (Exception exception)
+                {
+                    Console.WriteLine(exception);
+                }
+            };
+
+            // Make sure to clear the retained messages when they are all deleted via API.
+            server.RetainedMessagesClearedAsync += _ =>
+            {
+                File.Delete(storePath);
+                return Task.CompletedTask;
+            };
+
+            await server.StartAsync();
+
+            Console.WriteLine("Press Enter to exit.");
+            Console.ReadLine();
+        }
+    }
+}

Samples/Server/Server_Simple_Samples.cs

@@ -0,0 +1,173 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+// ReSharper disable UnusedType.Global
+// ReSharper disable UnusedMember.Global
+// ReSharper disable InconsistentNaming
+
+using MQTTnet.Protocol;
+using MQTTnet.Samples.Shared;
+using MQTTnet.Server;
+
+namespace MQTTnet.Samples.Server;
+
+public static class Server_Simple_Samples
+{
+    public static async Task Force_Disconnecting_Client()
+    {
+        /*
+         * This sample will disconnect a client.
+         *
+         * See _Run_Minimal_Server_ for more information.
+         */
+
+        using (var mqttServer = await StartMqttServer())
+        {
+            // Let the client connect.
+            await Task.Delay(TimeSpan.FromSeconds(5));
+
+            // Now disconnect the client (if connected).
+            var affectedClient = (await mqttServer.GetClientsAsync()).FirstOrDefault(c => c.Id == "MyClient");
+            if (affectedClient != null)
+            {
+                await affectedClient.DisconnectAsync();
+            }
+        }
+    }
+
+    public static async Task Publish_Message_From_Broker()
+    {
+        /*
+         * This sample will publish a message directly at the broker.
+         *
+         * See _Run_Minimal_Server_ for more information.
+         */
+
+        using (var mqttServer = await StartMqttServer())
+        {
+            // Create a new message using the builder as usual.
+            var message = new MqttApplicationMessageBuilder().WithTopic("HelloWorld").WithPayload("Test").Build();
+
+            // Now inject the new message at the broker.
+            await mqttServer.InjectApplicationMessage(
+                new InjectedMqttApplicationMessage(message)
+                {
+                    SenderClientId = "SenderClientId"
+                });
+        }
+    }
+
+    public static async Task Run_Minimal_Server()
+    {
+        /*
+         * This sample starts a simple MQTT server which will accept any TCP connection.
+         */
+
+        var mqttFactory = new MqttFactory();
+
+        // The port for the default endpoint is 1883.
+        // The default endpoint is NOT encrypted!
+        // Use the builder classes where possible.
+        var mqttServerOptions = new MqttServerOptionsBuilder().WithDefaultEndpoint().Build();
+
+        // The port can be changed using the following API (not used in this example).
+        // new MqttServerOptionsBuilder()
+        //     .WithDefaultEndpoint()
+        //     .WithDefaultEndpointPort(1234)
+        //     .Build();
+
+        using (var mqttServer = mqttFactory.CreateMqttServer(mqttServerOptions))
+        {
+            await mqttServer.StartAsync();
+
+            Console.WriteLine("Press Enter to exit.");
+            Console.ReadLine();
+
+            // Stop and dispose the MQTT server if it is no longer needed!
+            await mqttServer.StopAsync();
+        }
+    }
+
+    public static async Task Run_Server_With_Logging()
+    {
+        /*
+         * This sample starts a simple MQTT server and prints the logs to the output.
+         *
+         * IMPORTANT! Do not enable logging in live environment. It will decrease performance.
+         *
+         * See sample "Run_Minimal_Server" for more details.
+         */
+
+        var mqttFactory = new MqttFactory(new ConsoleLogger());
+
+        var mqttServerOptions = new MqttServerOptionsBuilder().WithDefaultEndpoint().Build();
+
+        using (var mqttServer = mqttFactory.CreateMqttServer(mqttServerOptions))
+        {
+            await mqttServer.StartAsync();
+
+            Console.WriteLine("Press Enter to exit.");
+            Console.ReadLine();
+
+            // Stop and dispose the MQTT server if it is no longer needed!
+            await mqttServer.StopAsync();
+        }
+    }
+
+    public static async Task Validating_Connections()
+    {
+        /*
+         * This sample starts a simple MQTT server which will check for valid credentials and client ID.
+         *
+         * See _Run_Minimal_Server_ for more information.
+         */
+
+        var mqttFactory = new MqttFactory();
+
+        var mqttServerOptions = new MqttServerOptionsBuilder().WithDefaultEndpoint().Build();
+
+        using (var mqttServer = mqttFactory.CreateMqttServer(mqttServerOptions))
+        {
+            // Setup connection validation before starting the server so that there is 
+            // no change to connect without valid credentials.
+            mqttServer.ValidatingConnectionAsync += e =>
+            {
+                if (e.ClientId != "ValidClientId")
+                {
+                    e.ReasonCode = MqttConnectReasonCode.ClientIdentifierNotValid;
+                }
+
+                if (e.UserName != "ValidUser")
+                {
+                    e.ReasonCode = MqttConnectReasonCode.BadUserNameOrPassword;
+                }
+
+                if (e.Password != "SecretPassword")
+                {
+                    e.ReasonCode = MqttConnectReasonCode.BadUserNameOrPassword;
+                }
+
+                return Task.CompletedTask;
+            };
+
+            await mqttServer.StartAsync();
+
+            Console.WriteLine("Press Enter to exit.");
+            Console.ReadLine();
+
+            await mqttServer.StopAsync();
+        }
+    }
+
+    static async Task<MqttServer> StartMqttServer()
+    {
+        var mqttFactory = new MqttFactory();
+
+        // Due to security reasons the "default" endpoint (which is unencrypted) is not enabled by default!
+        var mqttServerOptions = mqttFactory.CreateServerOptionsBuilder().WithDefaultEndpoint().Build();
+        var server = mqttFactory.CreateMqttServer(mqttServerOptions);
+        await server.StartAsync();
+        return server;
+    }
+}

Samples/Shared/ConsoleLogger.cs

@@ -0,0 +1,53 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using MQTTnet.Diagnostics;
+
+namespace MQTTnet.Samples.Shared;
+
+public sealed class ConsoleLogger : IMqttNetLogger
+{
+    readonly object _consoleSyncRoot = new();
+
+    public bool IsEnabled => true;
+
+    public void Publish(MqttNetLogLevel logLevel, string source, string message, object[]? parameters, Exception? exception)
+    {
+        var foregroundColor = ConsoleColor.White;
+        switch (logLevel)
+        {
+            case MqttNetLogLevel.Verbose:
+                foregroundColor = ConsoleColor.White;
+                break;
+
+            case MqttNetLogLevel.Info:
+                foregroundColor = ConsoleColor.Green;
+                break;
+
+            case MqttNetLogLevel.Warning:
+                foregroundColor = ConsoleColor.DarkYellow;
+                break;
+
+            case MqttNetLogLevel.Error:
+                foregroundColor = ConsoleColor.Red;
+                break;
+        }
+
+        if (parameters?.Length > 0)
+        {
+            message = string.Format(message, parameters);
+        }
+
+        lock (_consoleSyncRoot)
+        {
+            Console.ForegroundColor = foregroundColor;
+            Console.WriteLine(message);
+
+            if (exception != null)
+            {
+                Console.WriteLine(exception);
+            }
+        }
+    }
+}

Samples/Shared/ObjectExtensions.cs

@@ -0,0 +1,25 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Text.Json;
+
+namespace MQTTnet.Samples.Shared;
+
+internal static class ObjectExtensions
+{
+    public static TObject DumpToConsole<TObject>(this TObject @object)
+    {
+        var output = "NULL";
+        if (@object != null)
+        {
+            output = JsonSerializer.Serialize(@object, new JsonSerializerOptions
+            {
+                WriteIndented = true
+            });
+        }
+        
+        Console.WriteLine($"[{@object?.GetType().Name}]:\r\n{output}");
+        return @object;
+    }
+}

Source/MQTTnet.AspNetCore.Tests/MQTTnet.AspNetCore.Tests.csproj

@@ -0,0 +1,35 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>netcoreapp3.1</TargetFramework>
+        <IsPackable>false</IsPackable>
+        <DisableImplicitAspNetCoreAnalyzers>true</DisableImplicitAspNetCoreAnalyzers>
+        <EnableNETAnalyzers>false</EnableNETAnalyzers>
+        <EnforceCodeStyleInBuild>false</EnforceCodeStyleInBuild>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.2.0" />
+        <PackageReference Include="MSTest.TestAdapter" Version="2.2.10" />
+        <PackageReference Include="MSTest.TestFramework" Version="2.2.10" />
+        <PackageReference Include="Microsoft.CodeAnalysis.Compilers" Version="4.0.1" />
+        <PackageReference Include="Microsoft.Net.Compilers" Version="4.0.1" />
+    </ItemGroup>
+
+    <ItemGroup Condition=" '$(TargetFramework)' == 'netcoreapp3.1' ">
+        <PackageReference Include="Microsoft.AspNetCore.Hosting" Version="2.2.7" />
+        <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="2.2.0" />
+    </ItemGroup>
+
+    <ItemGroup Condition=" '$(TargetFramework)' != 'netcoreapp3.1' ">
+        <PackageReference Include="Microsoft.AspNetCore.Hosting" Version="2.1.1" />
+        <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="2.1.1" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\MQTTnet\MQTTnet.csproj" />
+        <ProjectReference Include="..\MQTTnet.AspnetCore\MQTTnet.AspNetCore.csproj" />
+        <ProjectReference Include="..\MQTTnet.Tests\MQTTnet.Tests.csproj" />
+    </ItemGroup>
+
+</Project>

Source/MQTTnet.AspNetCore.Tests/Mockups/ConnectionContextMockup.cs

@@ -1,4 +1,8 @@
-using System.Collections.Generic;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Collections.Generic;
 using System.IO.Pipelines;
 using Microsoft.AspNetCore.Connections;
 using Microsoft.AspNetCore.Http.Features;

Source/MQTTnet.AspNetCore.Tests/Mockups/ConnectionHandlerMockup.cs

@@ -1,9 +1,14 @@
-using Microsoft.AspNetCore.Connections;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.AspNetCore.Connections;
 using MQTTnet.Adapter;
 using MQTTnet.Formatter;
 using MQTTnet.Server;
 using System;
 using System.Threading.Tasks;
+using MQTTnet.Diagnostics;
 
 namespace MQTTnet.AspNetCore.Tests.Mockups
 {
@@ -12,16 +17,11 @@ namespace MQTTnet.AspNetCore.Tests.Mockups
         public TaskCompletionSource<MqttConnectionContext> Context { get; } = new TaskCompletionSource<MqttConnectionContext>();
         public Func<IMqttChannelAdapter, Task> ClientHandler { get; set; }
 
-        public ConnectionHandlerMockup()
-        {
-        }
-
         public async Task OnConnectedAsync(ConnectionContext connection)
         {
             try
             {
-                var writer = new SpanBasedMqttPacketWriter();
-                var formatter = new MqttPacketFormatterAdapter(writer);
+                var formatter = new MqttPacketFormatterAdapter(new MqttBufferWriter(4096, 65535));
                 var context = new MqttConnectionContext(formatter, connection);
                 Context.TrySetResult(context);
 
@@ -33,7 +33,7 @@ namespace MQTTnet.AspNetCore.Tests.Mockups
             }
         }
 
-        public Task StartAsync(IMqttServerOptions options)
+        public Task StartAsync(MqttServerOptions options, IMqttNetLogger logger)
         {
             return Task.CompletedTask;
         }

Source/MQTTnet.AspNetCore.Tests/Mockups/DuplexPipeMockup.cs

@@ -1,4 +1,8 @@
-using System.IO.Pipelines;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.IO.Pipelines;
 
 namespace MQTTnet.AspNetCore.Tests.Mockups
 {

Source/MQTTnet.AspNetCore.Tests/Mockups/LimitedMemoryPool.cs

@@ -1,4 +1,8 @@
-using System.Buffers;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Buffers;
 
 namespace MQTTnet.AspNetCore.Tests.Mockups
 {

Source/MQTTnet.AspNetCore.Tests/Mockups/MemoryOwner.cs

@@ -1,4 +1,8 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
 using System.Buffers;
 
 namespace MQTTnet.AspNetCore.Tests.Mockups

Source/MQTTnet.AspNetCore.Tests/MqttConnectionContextTest.cs

@@ -1,22 +1,25 @@
-using Microsoft.AspNetCore.Builder;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Connections;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 
 using System;
-using System.Linq;
+using System.Net;
 using System.Threading;
 using System.Threading.Tasks;
 using MQTTnet.Adapter;
 using MQTTnet.AspNetCore.Tests.Mockups;
-using MQTTnet.Client.Options;
 using MQTTnet.Exceptions;
 using MQTTnet.Formatter;
 using MQTTnet.Packets;
-using System.Net;
-using MQTTnet.AspNetCore.Extensions;
+using MQTTnet.Client;
 using MQTTnet.Protocol;
+using MQTTnet.Tests.Extensions;
 
 namespace MQTTnet.AspNetCore.Tests
 {
@@ -26,7 +29,7 @@ namespace MQTTnet.AspNetCore.Tests
         [TestMethod]
         public async Task TestReceivePacketAsyncThrowsWhenReaderCompleted()
         {
-            var serializer = new MqttPacketFormatterAdapter(MqttProtocolVersion.V311);
+            var serializer = new MqttPacketFormatterAdapter(MqttProtocolVersion.V311, new MqttBufferWriter(4096, 65535));
             var pipe = new DuplexPipeMockup();
             var connection = new DefaultConnectionContext();
             connection.Transport = pipe;
@@ -34,13 +37,13 @@ namespace MQTTnet.AspNetCore.Tests
 
             pipe.Receive.Writer.Complete();
 
-            await Assert.ThrowsExceptionAsync<MqttCommunicationException>(() => ctx.ReceivePacketAsync(TimeSpan.Zero, CancellationToken.None));
+            await Assert.ThrowsExceptionAsync<MqttCommunicationException>(() => ctx.ReceivePacketAsync(CancellationToken.None));
         }
 
         [TestMethod]
         public async Task TestCorruptedConnectPacket()
         {
-            var writer = new MqttPacketWriter();
+            var writer = new MqttBufferWriter(4096, 65535);
             var serializer = new MqttPacketFormatterAdapter(writer);
             var pipe = new DuplexPipeMockup();
             var connection = new DefaultConnectionContext();
@@ -49,10 +52,10 @@ namespace MQTTnet.AspNetCore.Tests
             
             await pipe.Receive.Writer.WriteAsync(writer.AddMqttHeader(MqttControlPacketType.Connect, new byte[0]));
 
-            await Assert.ThrowsExceptionAsync<MqttProtocolViolationException>(() => ctx.ReceivePacketAsync(TimeSpan.Zero, CancellationToken.None));
+            await Assert.ThrowsExceptionAsync<MqttProtocolViolationException>(() => ctx.ReceivePacketAsync(CancellationToken.None));
 
             // the first exception should complete the pipes so if someone tries to use the connection after that it should throw immidiatly
-            await Assert.ThrowsExceptionAsync<InvalidOperationException>(() =>  ctx.ReceivePacketAsync(TimeSpan.Zero, CancellationToken.None));
+            await Assert.ThrowsExceptionAsync<InvalidOperationException>(() =>  ctx.ReceivePacketAsync(CancellationToken.None));
         }
 
         // COMMENTED OUT DUE TO DEAD LOCK? OR VERY VERY SLOW PERFORMANCE ON LOCAL DEV MACHINE. TEST WAS STILL RUNNING AFTER SEVERAL MINUTES!
@@ -79,13 +82,13 @@ namespace MQTTnet.AspNetCore.Tests
         [TestMethod]
         public async Task TestLargePacket()
         {
-            var serializer = new MqttPacketFormatterAdapter(MqttProtocolVersion.V311);
+            var serializer = new MqttPacketFormatterAdapter(MqttProtocolVersion.V311, new MqttBufferWriter(4096, 65535));
             var pipe = new DuplexPipeMockup();
             var connection = new DefaultConnectionContext();
             connection.Transport = pipe;
             var ctx = new MqttConnectionContext(serializer, connection);
 
-            await ctx.SendPacketAsync(new MqttPublishPacket() { Payload = new byte[20_000] }, TimeSpan.Zero, CancellationToken.None).ConfigureAwait(false);
+            await ctx.SendPacketAsync(new MqttPublishPacket { Payload = new byte[20_000] }, CancellationToken.None).ConfigureAwait(false);
 
             var readResult = await pipe.Send.Reader.ReadAsync();
             Assert.IsTrue(readResult.Buffer.Length > 20000);
@@ -113,6 +116,7 @@ namespace MQTTnet.AspNetCore.Tests
                     services.AddSingleton<IMqttServerAdapter>(mockup);
                 })
                 .Build())
+                
             using (var client = new MqttFactory().CreateMqttClient())
             {
                 host.Start();

Source/MQTTnet.AspNetCore.Tests/ReaderExtensionsTest.cs

@@ -1,7 +1,11 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
 #if NETCOREAPP3_1
 using System.Buffers;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
-using MQTTnet.AspNetCore.Extensions;
+using MQTTnet.AspNetCore;
 using MQTTnet.Formatter;
 using MQTTnet.Packets;
 
@@ -13,35 +17,33 @@ namespace MQTTnet.AspNetCore.Tests
         [TestMethod]
         public void TestTryDeserialize()
         {
-            var serializer = new MqttPacketFormatterAdapter(MqttProtocolVersion.V311);
+            var serializer = new MqttPacketFormatterAdapter(MqttProtocolVersion.V311, new MqttBufferWriter(4096, 65535));
 
-            var buffer = serializer.Encode(new MqttPublishPacket() {Topic = "a", Payload = new byte[5]});
+            var buffer = serializer.Encode(new MqttPublishPacket {Topic = "a", Payload = new byte[5]}).Join();
 
             var sequence = new ReadOnlySequence<byte>(buffer.Array, buffer.Offset, buffer.Count);
 
             var part = sequence;
-            MqttBasePacket packet;
+            MqttPacket packet;
             var consumed = part.Start;
             var observed = part.Start;
             var result = false;
             var read = 0;
-
-            var reader = new SpanBasedMqttPacketBodyReader();
-
+            
             part = sequence.Slice(sequence.Start, 0); // empty message should fail
-            result = serializer.TryDecode(reader, part, out packet, out consumed, out observed, out read);
+            result = serializer.TryDecode(part, out packet, out consumed, out observed, out read);
             Assert.IsFalse(result);
 
             part = sequence.Slice(sequence.Start, 1); // partial fixed header should fail
-            result = serializer.TryDecode(reader, part, out packet, out consumed, out observed, out read);
+            result = serializer.TryDecode(part, out packet, out consumed, out observed, out read);
             Assert.IsFalse(result);
 
             part = sequence.Slice(sequence.Start, 4); // partial body should fail
-            result = serializer.TryDecode(reader, part, out packet, out consumed, out observed, out read);
+            result = serializer.TryDecode(part, out packet, out consumed, out observed, out read);
             Assert.IsFalse(result);
 
             part = sequence; // complete msg should work
-            result = serializer.TryDecode(reader, part, out packet, out consumed, out observed, out read);
+            result = serializer.TryDecode(part, out packet, out consumed, out observed, out read);
             Assert.IsTrue(result);
         }
     }

Source/MQTTnet.AspTestApp/MQTTnet.AspTestApp.csproj

@@ -0,0 +1,24 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+    <PropertyGroup>
+        <TargetFramework>net6.0</TargetFramework>
+        <Nullable>enable</Nullable>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <IsPackable>false</IsPackable>
+        <DisableImplicitAspNetCoreAnalyzers>true</DisableImplicitAspNetCoreAnalyzers>
+        <EnableNETAnalyzers>false</EnableNETAnalyzers>
+        <EnforceCodeStyleInBuild>false</EnforceCodeStyleInBuild>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\..\Source\MQTTnet.AspnetCore\MQTTnet.AspNetCore.csproj"/>
+
+        <PackageReference Include="Microsoft.CodeAnalysis.Compilers" Version="4.0.1" />
+        <PackageReference Include="Microsoft.Net.Compilers" Version="4.0.1" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <Folder Include="wwwroot\"/>
+    </ItemGroup>
+
+</Project>

Source/MQTTnet.AspTestApp/Pages/Index.cshtml

@@ -0,0 +1,34 @@
+@page
+@model IndexModel
+@{
+    ViewData["Title"] = "Home page";
+}
+
+<div>
+    <h1>MQTTnet ASP.NET Core Test App</h1>
+</div>
+
+<script src="https://unpkg.com/mqtt/dist/mqtt.min.js"></script>
+
+<script>
+    const options = {
+      clean: true,
+      connectTimeout: 4000,
+      clientId: 'mqttnet_web_client'
+    }
+
+    const client  = mqtt.connect('ws://localhost:5049/mqtt')
+
+    client.on('connect', function () {
+      console.log('Connected')
+      client.subscribe('#', function (err) {
+        if (!err) {
+          client.publish('test', 'Hello mqtt')
+        }
+      })
+    })
+
+    client.on('message', function (topic, message) {
+      console.log(message.toString())
+    })
+</script>

Source/MQTTnet.AspTestApp/Pages/Index.cshtml.cs

@@ -0,0 +1,23 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.AspNetCore.Mvc.RazorPages;
+
+namespace MQTTnet.AspTestApp.Pages
+{
+    public class IndexModel : PageModel
+    {
+        private readonly ILogger<IndexModel> _logger;
+
+        public IndexModel(ILogger<IndexModel> logger)
+        {
+            _logger = logger;
+        }
+
+        public void OnGet()
+        {
+
+        }
+    }
+}

Source/MQTTnet.AspTestApp/Pages/Shared/_Layout.cshtml

@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>@ViewData["Title"] - MQTTnet</title>
+</head>
+<body>
+
+    @RenderBody()
+
+    @await RenderSectionAsync("Scripts", required: false)
+</body>
+</html>

Source/MQTTnet.AspTestApp/Pages/_ViewImports.cshtml

@@ -0,0 +1,2 @@
+@namespace MQTTnet.AspTestApp.Pages
+@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

Source/MQTTnet.AspTestApp/Pages/_ViewStart.cshtml

@@ -0,0 +1,3 @@
+@{
+    Layout = "_Layout";
+}

Source/MQTTnet.AspTestApp/Program.cs

@@ -0,0 +1,73 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using MQTTnet;
+using MQTTnet.AspNetCore;
+using MQTTnet.Server;
+
+var builder = WebApplication.CreateBuilder(args);
+
+builder.Services.AddRazorPages();
+
+// Setup MQTT stuff.
+builder.Services.AddMqttServer();
+builder.Services.AddConnections();
+
+var app = builder.Build();
+
+if (!app.Environment.IsDevelopment())
+{
+    app.UseExceptionHandler("/Error");
+}
+
+app.UseStaticFiles();
+
+app.UseRouting();
+
+app.UseAuthorization();
+
+app.MapRazorPages();
+
+// Setup MQTT stuff.
+app.UseEndpoints(endpoints =>
+{
+    endpoints.MapMqtt("/mqtt");
+});
+
+app.UseMqttServer(server =>
+{
+    server.StartedAsync += args =>
+    {
+        _ = Task.Run(async () =>
+        {
+            var mqttApplicationMessage = new MqttApplicationMessageBuilder()
+                .WithPayload($"Test application message from MQTTnet server.")
+                .WithTopic("message")
+                .Build();
+
+            while (true)
+            {
+                try
+                {
+                    await server.InjectApplicationMessage(new InjectedMqttApplicationMessage(mqttApplicationMessage)
+                    {
+                        SenderClientId = "server"
+                    });
+                }
+                catch (Exception e)
+                {
+                    Console.WriteLine(e);
+                }
+                finally
+                {
+                    await Task.Delay(TimeSpan.FromSeconds(5));
+                }
+            }
+        });
+
+        return Task.CompletedTask;
+    };
+});
+
+app.Run();

Source/MQTTnet.AspTestApp/appsettings.Development.json

@@ -0,0 +1,9 @@
+{
+  "DetailedErrors": true,
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}

Source/MQTTnet.AspTestApp/appsettings.json

@@ -0,0 +1,9 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}

Source/MQTTnet.AspTestApp/libman.json

@@ -0,0 +1,5 @@
+{
+  "version": "1.0",
+  "defaultProvider": "cdnjs",
+  "libraries": []
+}

Source/MQTTnet.AspnetCore/ApplicationBuilderExtensions.cs

@@ -1,9 +1,13 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.Extensions.DependencyInjection;
 using MQTTnet.Server;
 
-namespace MQTTnet.AspNetCore.Extensions
+namespace MQTTnet.AspNetCore
 {
     public static class ApplicationBuilderExtensions
     {
@@ -36,9 +40,9 @@ namespace MQTTnet.AspNetCore.Extensions
             return app;
         }
 
-        public static IApplicationBuilder UseMqttServer(this IApplicationBuilder app, Action<IMqttServer> configure)
+        public static IApplicationBuilder UseMqttServer(this IApplicationBuilder app, Action<MqttServer> configure)
         {
-            var server = app.ApplicationServices.GetRequiredService<IMqttServer>();
+            var server = app.ApplicationServices.GetRequiredService<MqttServer>();
 
             configure(server);
 

Source/MQTTnet.AspnetCore/AspNetMqttServerOptionsBuilder.cs

@@ -1,13 +1,17 @@
-using MQTTnet.Server;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using MQTTnet.Server;
 using System;
 
 namespace MQTTnet.AspNetCore
 {
-    public class AspNetMqttServerOptionsBuilder : MqttServerOptionsBuilder
+    public sealed class AspNetMqttServerOptionsBuilder : MqttServerOptionsBuilder
     {
         public AspNetMqttServerOptionsBuilder(IServiceProvider serviceProvider)
         {
-            ServiceProvider = serviceProvider;
+            ServiceProvider = serviceProvider ?? throw new ArgumentNullException(nameof(serviceProvider));
         }
 
         public IServiceProvider ServiceProvider { get; }

Source/MQTTnet.AspnetCore/Client/MqttClientConnectionContextFactory.cs

@@ -1,15 +1,20 @@
-using MQTTnet.Adapter;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using MQTTnet.Adapter;
 using MQTTnet.AspNetCore.Client.Tcp;
-using MQTTnet.Client.Options;
 using MQTTnet.Formatter;
 using System;
 using System.Net;
+using MQTTnet.Client;
+using MQTTnet.Diagnostics;
 
 namespace MQTTnet.AspNetCore.Client
 {
-    public class MqttClientConnectionContextFactory : IMqttClientAdapterFactory
+    public sealed class MqttClientConnectionContextFactory : IMqttClientAdapterFactory
     {
-        public IMqttChannelAdapter CreateClientAdapter(IMqttClientOptions options)
+        public IMqttChannelAdapter CreateClientAdapter(MqttClientOptions options, MqttPacketInspector packetInspector, IMqttNetLogger logger)
         {
             if (options == null) throw new ArgumentNullException(nameof(options));
 
@@ -19,9 +24,8 @@ namespace MQTTnet.AspNetCore.Client
                     {
                         var endpoint = new DnsEndPoint(tcpOptions.Server, tcpOptions.GetPort());
                         var tcpConnection = new TcpConnection(endpoint);
-
-                        var writer = new SpanBasedMqttPacketWriter();
-                        var formatter = new MqttPacketFormatterAdapter(options.ProtocolVersion, writer);
+                        
+                        var formatter = new MqttPacketFormatterAdapter(options.ProtocolVersion, new MqttBufferWriter(4096, 65535));
                         return new MqttConnectionContext(formatter, tcpConnection);
                     }
                 default:

Source/MQTTnet.AspnetCore/Client/Tcp/BufferExtensions.cs

@@ -1,4 +1,8 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
 using System.Runtime.InteropServices;
 
 namespace MQTTnet.AspNetCore.Client.Tcp

Source/MQTTnet.AspnetCore/Client/Tcp/DuplexPipe.cs

@@ -1,4 +1,8 @@
-using System.IO.Pipelines;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.IO.Pipelines;
 
 namespace MQTTnet.AspNetCore.Client.Tcp
 {

Source/MQTTnet.AspnetCore/Client/Tcp/SocketAwaitable.cs

@@ -1,4 +1,8 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
 using System.Diagnostics;
 using System.IO.Pipelines;
 using System.Net.Sockets;

Source/MQTTnet.AspnetCore/Client/Tcp/SocketReceiver.cs

@@ -1,4 +1,8 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
 using System.IO.Pipelines;
 using System.Net.Sockets;
 

Source/MQTTnet.AspnetCore/Client/Tcp/SocketSender.cs

@@ -1,4 +1,8 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
 using System.Buffers;
 using System.Collections.Generic;
 using System.Diagnostics;

Source/MQTTnet.AspnetCore/Client/Tcp/TcpConnection.cs

@@ -1,4 +1,8 @@
-using Microsoft.AspNetCore.Connections;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.AspNetCore.Connections;
 using Microsoft.AspNetCore.Http.Features;
 using MQTTnet.Exceptions;
 using System;
@@ -40,7 +44,7 @@ namespace MQTTnet.AspNetCore.Client.Tcp
             _sender = new SocketSender(_socket, PipeScheduler.ThreadPool);
             _receiver = new SocketReceiver(_socket, PipeScheduler.ThreadPool);
         }
-#if NETCOREAPP3_1
+#if NETCOREAPP3_1 || NET5_0_OR_GREATER
         public override ValueTask DisposeAsync()
 #else
         public Task DisposeAsync()
@@ -53,7 +57,7 @@ namespace MQTTnet.AspNetCore.Client.Tcp
 
             _socket?.Dispose();
 
-#if NETCOREAPP3_1
+#if NETCOREAPP3_1 || NET5_0_OR_GREATER
 
             return base.DisposeAsync();
         }

Source/MQTTnet.AspnetCore/ConnectionBuilderExtensions.cs

@@ -0,0 +1,16 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.AspNetCore.Connections;
+
+namespace MQTTnet.AspNetCore
+{
+    public static class ConnectionBuilderExtensions
+    {
+        public static IConnectionBuilder UseMqtt(this IConnectionBuilder builder)
+        {
+            return builder.UseConnectionHandler<MqttConnectionHandler>();
+        }
+    }
+}

Source/MQTTnet.AspnetCore/ConnectionRouteBuilderExtensions.cs

@@ -1,17 +1,22 @@
-using Microsoft.AspNetCore.Http;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Http.Connections;
 
 #if NETCOREAPP3_1
 using System;
 #endif
 
-namespace MQTTnet.AspNetCore.Extensions
+namespace MQTTnet.AspNetCore
 {
     public static class ConnectionRouteBuilderExtensions
     {
 #if NETCOREAPP3_1
         [Obsolete("This class is obsolete and will be removed in a future version. The recommended alternative is to use MapMqtt inside Microsoft.AspNetCore.Builder.UseEndpoints(...).")]
 #endif
+#if NETCOREAPP3_1 || NETCOREAPP2_1 || NETSTANDARD
         public static void MapMqtt(this ConnectionsRouteBuilder connection, PathString path)
         {
             connection.MapConnectionHandler<MqttConnectionHandler>(path, options =>
@@ -19,5 +24,6 @@ namespace MQTTnet.AspNetCore.Extensions
                 options.WebSockets.SubProtocolSelector = MqttSubProtocolSelector.SelectSubProtocol;
             });
         }
+#endif
     }
 }

Source/MQTTnet.AspnetCore/EndpointRouterExtensions.cs

@@ -1,5 +1,9 @@
-
-#if NETCOREAPP3_1
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+
+#if NETCOREAPP3_1 || NET5_0_OR_GREATER
 
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Routing;

Source/MQTTnet.AspnetCore/Extensions/ConnectionBuilderExtensions.cs

@@ -1,12 +0,0 @@
-using Microsoft.AspNetCore.Connections;
-
-namespace MQTTnet.AspNetCore.Extensions
-{
-    public static class ConnectionBuilderExtensions
-    {
-        public static IConnectionBuilder UseMqtt(this IConnectionBuilder builder)
-        {
-            return builder.UseConnectionHandler<MqttConnectionHandler>();
-        }
-    }
-}

Source/MQTTnet.AspnetCore/MQTTnet.AspNetCore.csproj

@@ -1,36 +1,65 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
-  <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netcoreapp2.1;netcoreapp3.1</TargetFrameworks>
-    <Product />
-    <Company />
-    <Authors />
-    <PackageId />
-    <LangVersion>7.2</LangVersion>
-    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-    <PublishRepositoryUrl>true</PublishRepositoryUrl>
-    <IncludeSymbols>true</IncludeSymbols>
-    <SymbolPackageFormat>snupkg</SymbolPackageFormat>
-  </PropertyGroup>
+    <PropertyGroup>
+        <TargetFrameworks>netstandard2.0;netcoreapp2.1;netcoreapp3.1;net5.0;net6.0</TargetFrameworks>
 
-  <ItemGroup>
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
-  </ItemGroup>
+        <AssemblyName>MQTTnet.AspNetCore</AssemblyName>
+        <RootNamespace>MQTTnet.AspNetCore</RootNamespace>
+        <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
+        <Company>The contributors of MQTTnet</Company>
+        <Product>MQTTnet</Product>
+        <Description>MQTTnet is a high performance .NET library for MQTT based communication. It provides a MQTT client and a MQTT server (broker) and supports v3.1.0, v3.1.1 and v5.0.0 of the MQTT protocol.</Description>
+        <Authors>The contributors of MQTTnet</Authors>
+        <PackageId>MQTTnet.AspNetCore</PackageId>
+        <SignAssembly>false</SignAssembly>
+        <DelaySign>false</DelaySign>
+        <PublishRepositoryUrl>true</PublishRepositoryUrl>
+        <IncludeSymbols>true</IncludeSymbols>
+        <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+        <Copyright>Copyright (c) .NET Foundation and Contributors</Copyright>
+        <PackageProjectUrl>https://github.com/dotnet/MQTTnet</PackageProjectUrl>
+        <RepositoryUrl>https://github.com/dotnet/MQTTnet.git</RepositoryUrl>
+        <RepositoryType>git</RepositoryType>
+        <PackageTags>MQTT Message Queue Telemetry Transport MQTTClient MQTTServer Server MQTTBroker Broker NETStandard IoT InternetOfThings Messaging Hardware Arduino Sensor Actuator M2M ESP Smart Home Cities Automation Xamarin Blazor</PackageTags>
+        <NeutralLanguage>en-US</NeutralLanguage>
+        <EnableNETAnalyzers>false</EnableNETAnalyzers>
+        <EnforceCodeStyleInBuild>false</EnforceCodeStyleInBuild>
+        <PackageIcon>nuget.png</PackageIcon>
+        <EmbedUntrackedSources>true</EmbedUntrackedSources>
+        <ContinuousIntegrationBuild>true</ContinuousIntegrationBuild>
+        <PackageLicenseExpression>MIT</PackageLicenseExpression>
+        <PackageReleaseNotes>For release notes please go to MQTTnet release notes (https://www.nuget.org/packages/MQTTnet/).</PackageReleaseNotes>
+        <DisableImplicitAspNetCoreAnalyzers>true</DisableImplicitAspNetCoreAnalyzers>
+        <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+        <GenerateDocumentationFile>true</GenerateDocumentationFile>
+        <NoWarn>1591</NoWarn>
+    </PropertyGroup>
 
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
-    <DefineConstants>RELEASE;NETSTANDARD2_0</DefineConstants>
-  </PropertyGroup>
-
-  <ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
-    <FrameworkReference Include="Microsoft.AspNetCore.App" />
-  </ItemGroup>
+    <ItemGroup>
+        <None Include="..\..\Images\nuget.png">
+            <Pack>True</Pack>
+            <PackagePath>\</PackagePath>
+        </None>
+    </ItemGroup>
     
-  <ItemGroup Condition="'$(TargetFramework)' != 'netcoreapp3.1'">
-    <PackageReference Include="Microsoft.AspNetCore.Http.Connections" Version="1.1.0" />
-  </ItemGroup>
+    <ItemGroup>
+        <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />
+    </ItemGroup>
 
-  <ItemGroup>
-    <ProjectReference Include="..\MQTTnet\MQTTnet.csproj" />
-  </ItemGroup>
+    <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
+        <DefineConstants>RELEASE;NETSTANDARD2_0</DefineConstants>
+    </PropertyGroup>
+
+    <ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1' or '$(TargetFramework)' == 'net5.0' or '$(TargetFramework)' == 'net6.0' ">
+        <FrameworkReference Include="Microsoft.AspNetCore.App" />
+    </ItemGroup>
+
+    <ItemGroup Condition="'$(TargetFramework)' != 'netcoreapp3.1' and '$(TargetFramework)' != 'net5.0' and '$(TargetFramework)' != 'net6.0' ">
+        <PackageReference Include="Microsoft.AspNetCore.Http.Connections" Version="1.1.0" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\MQTTnet\MQTTnet.csproj" />
+    </ItemGroup>
 
 </Project>

Source/MQTTnet.AspnetCore/MqttConnectionContext.cs

@@ -1,4 +1,8 @@
-using Microsoft.AspNetCore.Connections;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.AspNetCore.Connections;
 using Microsoft.AspNetCore.Http.Connections.Features;
 using MQTTnet.Adapter;
 using MQTTnet.AspNetCore.Client.Tcp;
@@ -10,7 +14,6 @@ using System.IO.Pipelines;
 using System.Security.Cryptography.X509Certificates;
 using System.Threading;
 using System.Threading.Tasks;
-using MQTTnet.AspNetCore.Extensions;
 using MQTTnet.Internal;
 
 namespace MQTTnet.AspNetCore
@@ -18,7 +21,6 @@ namespace MQTTnet.AspNetCore
     public sealed class MqttConnectionContext : IMqttChannelAdapter
     {
         readonly AsyncLock _writerLock = new AsyncLock();
-        readonly SpanBasedMqttPacketBodyReader _reader;
         
         PipeReader _input;
         PipeWriter _output;
@@ -33,8 +35,6 @@ namespace MQTTnet.AspNetCore
                 _input = Connection.Transport.Input;
                 _output = Connection.Transport.Output;
             }
-
-            _reader = new SpanBasedMqttPacketBodyReader();
         }
 
         public string Endpoint
@@ -66,14 +66,14 @@ namespace MQTTnet.AspNetCore
         public MqttPacketFormatterAdapter PacketFormatterAdapter { get; }
 
         public long BytesSent { get; set; }
+
         public long BytesReceived { get; set; }
 
-        public Action ReadingPacketStartedCallback { get; set; }
-        public Action ReadingPacketCompletedCallback { get; set; }
+        public bool IsReadingPacket { get; private set; }
 
         IHttpContextFeature Http => Connection.Features.Get<IHttpContextFeature>();
 
-        public async Task ConnectAsync(TimeSpan timeout, CancellationToken cancellationToken)
+        public async Task ConnectAsync(CancellationToken cancellationToken)
         {
             if (Connection is TcpConnection tcp && !tcp.IsConnected)
             {
@@ -84,7 +84,7 @@ namespace MQTTnet.AspNetCore
             _output = Connection.Transport.Output;
         }
 
-        public Task DisconnectAsync(TimeSpan timeout, CancellationToken cancellationToken)
+        public Task DisconnectAsync(CancellationToken cancellationToken)
         {
             _input?.Complete();
             _output?.Complete();
@@ -92,7 +92,7 @@ namespace MQTTnet.AspNetCore
             return Task.CompletedTask;
         }
 
-        public async Task<MqttBasePacket> ReceivePacketAsync(TimeSpan timeout, CancellationToken cancellationToken)
+        public async Task<MqttPacket> ReceivePacketAsync(CancellationToken cancellationToken)
         {
             var input = Connection.Transport.Input;
 
@@ -120,7 +120,7 @@ namespace MQTTnet.AspNetCore
                     {
                         if (!buffer.IsEmpty)
                         {
-                            if (PacketFormatterAdapter.TryDecode(_reader, buffer, out var packet, out consumed, out observed, out var received))
+                            if (PacketFormatterAdapter.TryDecode(buffer, out var packet, out consumed, out observed, out var received))
                             {
                                 BytesReceived += received;
                                 return packet;
@@ -128,7 +128,7 @@ namespace MQTTnet.AspNetCore
                             else
                             {
                                 // we did receive something but the message is not yet complete
-                                ReadingPacketStartedCallback?.Invoke();
+                                IsReadingPacket = true;
                             }
                         }
                         else if (readResult.IsCompleted)
@@ -147,14 +147,14 @@ namespace MQTTnet.AspNetCore
             }
             catch (Exception e)
             {
-                // completing the cannels makes sure that there is no more data read after a protocol error
+                // completing the channel makes sure that there is no more data read after a protocol error
                 _input?.Complete(e);
                 _output?.Complete(e);
                 throw;
             }
             finally
             {
-                ReadingPacketCompletedCallback?.Invoke();
+                IsReadingPacket = false;
             }
 
             cancellationToken.ThrowIfCancellationRequested();
@@ -167,20 +167,22 @@ namespace MQTTnet.AspNetCore
             BytesSent = 0;
         }
 
-        public async Task SendPacketAsync(MqttBasePacket packet, TimeSpan timeout, CancellationToken cancellationToken)
+        public async Task SendPacketAsync(MqttPacket packet, CancellationToken cancellationToken)
         {
             var formatter = PacketFormatterAdapter;
+            
             using (await _writerLock.WaitAsync(cancellationToken).ConfigureAwait(false))
             {
                 var buffer = formatter.Encode(packet);
-                var msg = buffer.AsMemory();
+                var msg = buffer.Join().AsMemory();
                 var output = _output;
                 var result = await output.WriteAsync(msg, cancellationToken).ConfigureAwait(false);
                 if (result.IsCompleted)
                 {
                     BytesSent += msg.Length;
                 }
-                PacketFormatterAdapter.FreeBuffer();
+
+                PacketFormatterAdapter.Cleanup();
             }
         }
 

Source/MQTTnet.AspnetCore/MqttConnectionHandler.cs

@@ -1,15 +1,22 @@
-using Microsoft.AspNetCore.Connections;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.AspNetCore.Connections;
 using Microsoft.AspNetCore.Connections.Features;
 using MQTTnet.Adapter;
 using MQTTnet.Server;
 using System;
 using System.Threading.Tasks;
+using MQTTnet.Diagnostics;
 using MQTTnet.Formatter;
 
 namespace MQTTnet.AspNetCore
 {
-    public class MqttConnectionHandler : ConnectionHandler, IMqttServerAdapter
+    public sealed class MqttConnectionHandler : ConnectionHandler, IMqttServerAdapter
     {
+        MqttServerOptions _serverOptions;
+        
         public Func<IMqttChannelAdapter, Task> ClientHandler { get; set; }
 
         public override async Task OnConnectedAsync(ConnectionContext connection)
@@ -20,9 +27,8 @@ namespace MQTTnet.AspNetCore
             {
                 transferFormatFeature.ActiveFormat = TransferFormat.Binary;
             }
-
-            var writer = new SpanBasedMqttPacketWriter();
-            var formatter = new MqttPacketFormatterAdapter(writer);
+            
+            var formatter = new MqttPacketFormatterAdapter(new MqttBufferWriter(_serverOptions.WriterBufferSize, _serverOptions.WriterBufferSizeMax));
             using (var adapter = new MqttConnectionContext(formatter, connection))
             {
                 var clientHandler = ClientHandler;
@@ -33,8 +39,10 @@ namespace MQTTnet.AspNetCore
             }
         }
 
-        public Task StartAsync(IMqttServerOptions options)
+        public Task StartAsync(MqttServerOptions options, IMqttNetLogger logger)
         {
+            _serverOptions = options;
+
             return Task.CompletedTask;
         }
 

Source/MQTTnet.AspnetCore/MqttHostedServer.cs

@@ -1,4 +1,7 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
 using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
@@ -9,19 +12,16 @@ using MQTTnet.Server;
 
 namespace MQTTnet.AspNetCore
 {
-    public class MqttHostedServer : MqttServer, IHostedService
+    public sealed class MqttHostedServer : MqttServer, IHostedService
     {
-        private readonly IMqttServerOptions _options;
-
-        public MqttHostedServer(IMqttServerOptions options, IEnumerable<IMqttServerAdapter> adapters, IMqttNetLogger logger) 
-            : base(adapters, logger)
+        public MqttHostedServer(MqttServerOptions options, IEnumerable<IMqttServerAdapter> adapters, IMqttNetLogger logger) 
+            : base(options, adapters, logger)
         {
-            _options = options ?? throw new ArgumentNullException(nameof(options));
         }
 
         public Task StartAsync(CancellationToken cancellationToken)
         {
-            _ = StartAsync(_options);
+            _ =  StartAsync();
             return Task.CompletedTask;
         }
 
@@ -30,4 +30,4 @@ namespace MQTTnet.AspNetCore
             return StopAsync();
         }
     }
-}
+}

Source/MQTTnet.AspnetCore/MqttSubProtocolSelector.cs

@@ -1,4 +1,8 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Microsoft.AspNetCore.Http;

Source/MQTTnet.AspnetCore/MqttWebSocketServerAdapter.cs

@@ -1,28 +1,28 @@
-using Microsoft.AspNetCore.Http;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.AspNetCore.Http;
 using MQTTnet.Adapter;
-using MQTTnet.Diagnostics;
 using MQTTnet.Formatter;
 using MQTTnet.Implementations;
 using MQTTnet.Server;
 using System;
 using System.Net.WebSockets;
 using System.Threading.Tasks;
+using MQTTnet.Diagnostics;
 
 namespace MQTTnet.AspNetCore
 {
     public sealed class MqttWebSocketServerAdapter : IMqttServerAdapter
     {
-        readonly IMqttNetLogger _rootLogger;
-
-        public MqttWebSocketServerAdapter(IMqttNetLogger logger)
-        {
-            _rootLogger = logger ?? throw new ArgumentNullException(nameof(logger));
-        }
-
+        IMqttNetLogger _logger = new MqttNetNullLogger();
+        
         public Func<IMqttChannelAdapter, Task> ClientHandler { get; set; }
 
-        public Task StartAsync(IMqttServerOptions options)
+        public Task StartAsync(MqttServerOptions options, IMqttNetLogger logger)
         {
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
             return Task.CompletedTask;
         }
 
@@ -45,11 +45,10 @@ namespace MQTTnet.AspNetCore
                 var clientHandler = ClientHandler;
                 if (clientHandler != null)
                 {
-                    var writer = new SpanBasedMqttPacketWriter();
-                    var formatter = new MqttPacketFormatterAdapter(writer);
+                    var formatter = new MqttPacketFormatterAdapter(new MqttBufferWriter(4096, 65535));
                     var channel = new MqttWebSocketChannel(webSocket, endpoint, isSecureConnection, clientCertificate);
 
-                    using (var channelAdapter = new MqttChannelAdapter(channel, formatter, _rootLogger))
+                    using (var channelAdapter = new MqttChannelAdapter(channel, formatter, null, _logger))
                     {
                         await clientHandler(channelAdapter).ConfigureAwait(false);
                     }

Source/MQTTnet.AspnetCore/ReaderExtensions.cs

@@ -1,18 +1,21 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
 using System.Buffers;
 using MQTTnet.Adapter;
 using MQTTnet.Exceptions;
 using MQTTnet.Formatter;
 using MQTTnet.Packets;
 
-namespace MQTTnet.AspNetCore.Extensions
+namespace MQTTnet.AspNetCore
 {
     public static class ReaderExtensions
     {
         public static bool TryDecode(this MqttPacketFormatterAdapter formatter, 
-            SpanBasedMqttPacketBodyReader reader, 
             in ReadOnlySequence<byte> input, 
-            out MqttBasePacket packet, 
+            out MqttPacket packet, 
             out SequencePosition consumed, 
             out SequencePosition observed,
             out int bytesRead)
@@ -30,7 +33,7 @@ namespace MQTTnet.AspNetCore.Extensions
                 return false;
             }
 
-            var fixedheader = copy.First.Span[0];
+            var fixedHeader = copy.First.Span[0];
             if (!TryReadBodyLength(ref copy, out int headerLength, out var bodyLength))
             {
                 return false;
@@ -42,10 +45,9 @@ namespace MQTTnet.AspNetCore.Extensions
             }
 
             var bodySlice = copy.Slice(0, bodyLength);
-            var buffer = bodySlice.GetMemory();
-            reader.SetBuffer(buffer);
-
-            var receivedMqttPacket = new ReceivedMqttPacket(fixedheader, reader, buffer.Length + 2);
+            var buffer = bodySlice.GetMemory().ToArray();
+            
+            var receivedMqttPacket = new ReceivedMqttPacket(fixedHeader, new ArraySegment<byte>(buffer, 0, buffer.Length), buffer.Length + 2);
 
             if (formatter.ProtocolVersion == MqttProtocolVersion.Unknown)
             {
@@ -59,7 +61,7 @@ namespace MQTTnet.AspNetCore.Extensions
             return true;
         }
 
-        private static ReadOnlyMemory<byte> GetMemory(this in ReadOnlySequence<byte> input)
+        static ReadOnlyMemory<byte> GetMemory(this in ReadOnlySequence<byte> input)
         {
             if (input.IsSingleSegment)
             {
@@ -70,7 +72,7 @@ namespace MQTTnet.AspNetCore.Extensions
             return input.ToArray();
         }
 
-        private static bool TryReadBodyLength(ref ReadOnlySequence<byte> input, out int headerLength, out int bodyLength)
+        static bool TryReadBodyLength(ref ReadOnlySequence<byte> input, out int headerLength, out int bodyLength)
         {
             // Alorithm taken from https://docs.oasis-open.org/mqtt/mqtt/v3.1.1/errata01/os/mqtt-v3.1.1-errata01-os-complete.html.
             var multiplier = 1;
@@ -88,6 +90,7 @@ namespace MQTTnet.AspNetCore.Extensions
                 {
                     return false;
                 }
+
                 encodedByte = temp[index];
                 index++;
 

Source/MQTTnet.AspnetCore/ServiceCollectionExtensions.cs

@@ -1,4 +1,8 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 using MQTTnet.Adapter;
@@ -6,11 +10,24 @@ using MQTTnet.Diagnostics;
 using MQTTnet.Implementations;
 using MQTTnet.Server;
 
-namespace MQTTnet.AspNetCore.Extensions
+namespace MQTTnet.AspNetCore
 {
     public static class ServiceCollectionExtensions
     {
-        public static IServiceCollection AddHostedMqttServer(this IServiceCollection services, IMqttServerOptions options)
+        public static IServiceCollection AddMqttServer(this IServiceCollection serviceCollection, Action<MqttServerOptionsBuilder> configure = null)
+        {
+            if (serviceCollection is null)
+            {
+                throw new ArgumentNullException(nameof(serviceCollection));
+            }
+
+            serviceCollection.AddMqttConnectionHandler();
+            serviceCollection.AddHostedMqttServer(configure);
+            
+            return serviceCollection;
+        }
+
+        public static IServiceCollection AddHostedMqttServer(this IServiceCollection services, MqttServerOptions options)
         {
             if (options == null) throw new ArgumentNullException(nameof(options));
 
@@ -21,13 +38,13 @@ namespace MQTTnet.AspNetCore.Extensions
             return services;
         }
 
-        public static IServiceCollection AddHostedMqttServer(this IServiceCollection services, Action<MqttServerOptionsBuilder> configure)
+        public static IServiceCollection AddHostedMqttServer(this IServiceCollection services, Action<MqttServerOptionsBuilder> configure = null)
         {
-            services.AddSingleton<IMqttServerOptions>(s =>
+            services.AddSingleton(s =>
             {
-                var builder = new MqttServerOptionsBuilder();
-                configure(builder);
-                return builder.Build();
+                var serverOptionsBuilder = new MqttServerOptionsBuilder();
+                configure?.Invoke(serverOptionsBuilder);
+                return serverOptionsBuilder.Build();
             });
 
             services.AddHostedMqttServer();
@@ -37,7 +54,7 @@ namespace MQTTnet.AspNetCore.Extensions
 
         public static IServiceCollection AddHostedMqttServerWithServices(this IServiceCollection services, Action<AspNetMqttServerOptionsBuilder> configure)
         {
-            services.AddSingleton<IMqttServerOptions>(s =>
+            services.AddSingleton(s =>
             {
                 var builder = new AspNetMqttServerOptionsBuilder(s);
                 configure(builder);
@@ -49,24 +66,14 @@ namespace MQTTnet.AspNetCore.Extensions
             return services;
         }
 
-        public static IServiceCollection AddHostedMqttServer<TOptions>(this IServiceCollection services)
-            where TOptions : class, IMqttServerOptions
+        static IServiceCollection AddHostedMqttServer(this IServiceCollection services)
         {
-            services.AddSingleton<IMqttServerOptions, TOptions>();
-
-            services.AddHostedMqttServer();
-
-            return services;
-        }
-
-        private static IServiceCollection AddHostedMqttServer(this IServiceCollection services)
-        {
-            var logger = new MqttNetLogger();
+            var logger = new MqttNetEventLogger();
 
             services.AddSingleton<IMqttNetLogger>(logger);
             services.AddSingleton<MqttHostedServer>();
             services.AddSingleton<IHostedService>(s => s.GetService<MqttHostedServer>());
-            services.AddSingleton<IMqttServer>(s => s.GetService<MqttHostedServer>());
+            services.AddSingleton<MqttServer>(s => s.GetService<MqttHostedServer>());
 
             return services;
         }

Source/MQTTnet.AspnetCore/SpanBasedMqttPacketBodyReader.cs

@@ -1,129 +0,0 @@
-using MQTTnet.Exceptions;
-using MQTTnet.Formatter;
-using System;
-using System.Buffers.Binary;
-using System.Text;
-
-namespace MQTTnet.AspNetCore
-{
-    public class SpanBasedMqttPacketBodyReader : IMqttPacketBodyReader
-    {
-        ReadOnlyMemory<byte> _buffer;
-
-        int _offset;
-        
-        public void SetBuffer(ReadOnlyMemory<byte> buffer)
-        {
-            _buffer = buffer;
-            _offset = 0;
-        }
-
-        public int Length => _buffer.Length;
-
-        public bool EndOfStream => _buffer.Length.Equals(_offset);
-        
-        public int Offset => _offset;
-
-        public byte ReadByte()
-        {
-            return _buffer.Span[_offset++];
-        }
-
-        public byte[] ReadRemainingData()
-        {
-            return _buffer.Slice(_offset).ToArray();
-        }
-
-        public byte[] ReadWithLengthPrefix()
-        {
-            return ReadSegmentWithLengthPrefix().ToArray();
-        }
-        
-        public unsafe string ReadStringWithLengthPrefix()
-        {
-            var buffer = ReadSegmentWithLengthPrefix();
-            if (buffer.Length == 0)
-            {
-                return string.Empty;
-            }
-
-            fixed (byte* bytes = &buffer.GetPinnableReference())
-            {
-                var result = Encoding.UTF8.GetString(bytes, buffer.Length);
-                return result;
-            }
-        }
-
-        public ushort ReadTwoByteInteger()
-        {
-            var result = BinaryPrimitives.ReadUInt16BigEndian(_buffer.Span.Slice(_offset));
-            _offset += 2;
-            return result;
-        }
-
-        public uint ReadFourByteInteger()
-        {
-            var result = BinaryPrimitives.ReadUInt32BigEndian(_buffer.Span.Slice(_offset));
-            _offset += 4;
-            return result;
-        }
-
-        public uint ReadVariableLengthInteger()
-        {
-            var multiplier = 1;
-            var value = 0U;
-            byte encodedByte;
-
-            do
-            {
-                encodedByte = ReadByte();
-                value += (uint)((encodedByte & 127) * multiplier);
-
-                if (multiplier > 2097152)
-                {
-                    throw new MqttProtocolViolationException("Variable length integer is invalid.");
-                }
-
-                multiplier *= 128;
-            } while ((encodedByte & 128) != 0);
-
-            return value;
-        }
-
-        public bool ReadBoolean()
-        {
-            var buffer = ReadByte();
-
-            if (buffer == 0)
-            {
-                return false;
-            }
-
-            if (buffer == 1)
-            {
-                return true;
-            }
-
-            throw new MqttProtocolViolationException("Boolean values can be 0 or 1 only.");
-        }
-
-        public void Seek(int position)
-        {
-            _offset = position;
-        }
-
-        ReadOnlySpan<byte> ReadSegmentWithLengthPrefix()
-        {
-            var span = _buffer.Span;
-            var length = BinaryPrimitives.ReadUInt16BigEndian(span.Slice(_offset));
-
-            if (Length < _offset + length)
-            {
-                throw new MqttProtocolViolationException($"Expected at least {_offset + 2 + length} bytes but there are only {Length} bytes");
-            }
-            var result = span.Slice(_offset + 2, length);
-            _offset += 2 + length;
-            return result;
-        }
-    }
-}

Source/MQTTnet.AspnetCore/SpanBasedMqttPacketWriter.cs

@@ -1,144 +0,0 @@
-using MQTTnet.Formatter;
-using System;
-using System.Buffers;
-using System.Buffers.Binary;
-using System.Text;
-
-namespace MQTTnet.AspNetCore
-{
-    public class SpanBasedMqttPacketWriter : IMqttPacketWriter
-    {
-        readonly ArrayPool<byte> _pool = ArrayPool<byte>.Create();
-
-        public SpanBasedMqttPacketWriter()
-        {
-            Reset(0);
-        }
-
-        byte[] _buffer;
-        int _position;
-
-        public int Length { get; set; }
-
-        public void FreeBuffer()
-        {
-            _pool.Return(_buffer);
-        }
-
-        public byte[] GetBuffer()
-        {
-            return _buffer;
-        }
-
-        public void Reset(int v)
-        {
-            _buffer = _pool.Rent(1500);
-            Length = v;
-            _position = v;
-        }
-
-        public void Seek(int v)
-        {
-            _position = v;
-        }
-
-        public void Write(byte value)
-        {
-            GrowIfNeeded(1);
-            _buffer[_position] = value;
-            Commit(1);
-        }
-
-        public void Write(ushort value)
-        {
-            GrowIfNeeded(2);
-
-            BinaryPrimitives.WriteUInt16BigEndian(_buffer.AsSpan(_position), value);
-            Commit(2);
-        }
-
-        public void Write(IMqttPacketWriter propertyWriter)
-        {
-            if (propertyWriter == null) throw new ArgumentNullException(nameof(propertyWriter));
-
-            GrowIfNeeded(propertyWriter.Length);
-            Write(propertyWriter.GetBuffer(), 0, propertyWriter.Length);
-        }
-
-        public void Write(byte[] payload, int start, int length)
-        {
-            GrowIfNeeded(length);
-
-            payload.AsSpan(start, length).CopyTo(_buffer.AsSpan(_position));
-            Commit(length);
-        }
-
-        public void WriteVariableLengthInteger(uint value)
-        {
-            GrowIfNeeded(4);
-            
-            var x = value;
-            do
-            {
-                var encodedByte = x % 128;
-                x = x / 128;
-                if (x > 0)
-                {
-                    encodedByte = encodedByte | 128;
-                }
-
-                _buffer[_position] = (byte)encodedByte;
-                Commit(1);
-            } while (x > 0);
-        }
-
-        public void WriteWithLengthPrefix(string value)
-        {
-            var bytesLength = Encoding.UTF8.GetByteCount(value ?? string.Empty);
-            GrowIfNeeded(bytesLength + 2);
-
-            Write((ushort)bytesLength);
-            Encoding.UTF8.GetBytes(value ?? string.Empty, 0, value?.Length ?? 0, _buffer, _position);
-            Commit(bytesLength);
-        }
-
-        public void WriteWithLengthPrefix(byte[] payload)
-        {
-            GrowIfNeeded(payload.Length + 2);
-            
-            Write((ushort)payload.Length);
-            payload.CopyTo(_buffer, _position);
-            Commit(payload.Length);
-        }
-
-        void Commit(int count)
-        {
-            if (_position == Length)
-            {
-                Length += count;
-            }
-
-            _position += count;
-        }
-
-        void GrowIfNeeded(int requiredAdditional) 
-        {
-            var requiredTotal = _position + requiredAdditional;
-            if (_buffer.Length >= requiredTotal)
-            {
-                return;
-            }
-
-            var newBufferLength = _buffer.Length;
-            while (newBufferLength < requiredTotal)
-            {
-                newBufferLength *= 2;
-            }
-
-            var newBuffer = _pool.Rent(newBufferLength);
-            Array.Copy(_buffer, newBuffer, _buffer.Length);
-            _pool.Return(_buffer);
-            _buffer = newBuffer;
-        }
-    }
-}

Source/MQTTnet.Benchmarks/BaseBenchmark.cs

@@ -0,0 +1,6 @@
+namespace MQTTnet.Benchmarks
+{
+    public abstract class BaseBenchmark
+    {
+    }
+}

Source/MQTTnet.Benchmarks/ChannelAdapterBenchmark.cs

@@ -1,22 +1,27 @@
-using BenchmarkDotNet.Attributes;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using BenchmarkDotNet.Attributes;
 using MQTTnet.Adapter;
-using MQTTnet.Diagnostics;
 using MQTTnet.Internal;
 using MQTTnet.Packets;
 using System;
 using System.IO;
 using System.Threading;
+using MQTTnet.Diagnostics;
 using MQTTnet.Formatter;
+using MQTTnet.Tests.Mockups;
 
 namespace MQTTnet.Benchmarks
 {
     [MemoryDiagnoser]
-    public class ChannelAdapterBenchmark
+    public sealed class ChannelAdapterBenchmark
     {
-        private MqttChannelAdapter _channelAdapter;
-        private int _iterations;
-        private MemoryStream _stream;
-        private MqttPublishPacket _packet;
+        MqttChannelAdapter _channelAdapter;
+        int _iterations;
+        MemoryStream _stream;
+        MqttPublishPacket _packet;
 
         [GlobalSetup]
         public void Setup()
@@ -26,9 +31,9 @@ namespace MQTTnet.Benchmarks
                 Topic = "A"
             };
 
-            var serializer = new MqttPacketFormatterAdapter(MqttProtocolVersion.V311);
+            var serializer = new MqttPacketFormatterAdapter(MqttProtocolVersion.V311, new MqttBufferWriter(4096, 65535));
             
-            var serializedPacket = Join(serializer.Encode(_packet));
+            var serializedPacket = Join(serializer.Encode(_packet).Join());
 
             _iterations = 10000;
 
@@ -41,9 +46,9 @@ namespace MQTTnet.Benchmarks
 
             _stream.Position = 0;
 
-            var channel = new TestMqttChannel(_stream);
+            var channel = new MemoryMqttChannel(_stream);
             
-            _channelAdapter = new MqttChannelAdapter(channel, serializer, new MqttNetLogger());
+            _channelAdapter = new MqttChannelAdapter(channel, serializer, null, new MqttNetEventLogger());
         }
 
         [Benchmark]
@@ -53,7 +58,7 @@ namespace MQTTnet.Benchmarks
 
             for (var i = 0; i < 10000; i++)
             {
-                _channelAdapter.ReceivePacketAsync(TimeSpan.Zero, CancellationToken.None).GetAwaiter().GetResult();
+                _channelAdapter.ReceivePacketAsync(CancellationToken.None).GetAwaiter().GetResult();
             }
 
             _stream.Position = 0;
@@ -66,13 +71,13 @@ namespace MQTTnet.Benchmarks
 
             for (var i = 0; i < 10000; i++)
             {
-                _channelAdapter.SendPacketAsync(_packet, TimeSpan.Zero, CancellationToken.None).GetAwaiter().GetResult();
+                _channelAdapter.SendPacketAsync(_packet, CancellationToken.None).GetAwaiter().GetResult();
             }
 
             _stream.Position = 0;
         }
 
-        private static byte[] Join(params ArraySegment<byte>[] chunks)
+        static byte[] Join(params ArraySegment<byte>[] chunks)
         {
             var buffer = new MemoryStream();
             foreach (var chunk in chunks)

Source/MQTTnet.Benchmarks/Configurations/AllowNonOptimized.cs

@@ -1,5 +1,7 @@
-using System.Linq;
-using BenchmarkDotNet.Configs;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
 using BenchmarkDotNet.Jobs;
 using BenchmarkDotNet.Validators;
 

Source/MQTTnet.Benchmarks/Configurations/BaseConfig.cs

@@ -1,4 +1,8 @@
-using BenchmarkDotNet.Configs;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using BenchmarkDotNet.Configs;
 using System.Linq;
 
 namespace MQTTnet.Benchmarks.Configurations

Source/MQTTnet.Benchmarks/Configurations/RuntimeCompareConfig.cs

@@ -0,0 +1,19 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using BenchmarkDotNet.Environments;
+using BenchmarkDotNet.Jobs;
+using BenchmarkDotNet.Toolchains.CsProj;
+
+namespace MQTTnet.Benchmarks.Configurations
+{
+    public class RuntimeCompareConfig : BaseConfig
+    {
+        public RuntimeCompareConfig()
+        {
+            AddJob(Job.Default.WithRuntime(ClrRuntime.Net48));
+            AddJob(Job.Default.WithRuntime(CoreRuntime.Core50).WithToolchain(CsProjCoreToolchain.NetCoreApp50));
+        }
+    }
+}

Source/MQTTnet.Benchmarks/LoggerBenchmark.cs

@@ -0,0 +1,91 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Jobs;
+using MQTTnet.Diagnostics;
+
+namespace MQTTnet.Benchmarks
+{
+    [SimpleJob(RuntimeMoniker.Net60)]
+    [RPlotExporter]
+    [MemoryDiagnoser]
+    public class LoggerBenchmark
+    {
+        MqttNetNullLogger _nullLogger;
+        MqttNetSourceLogger _sourceNullLogger;
+        
+        MqttNetEventLogger _eventLogger;
+        MqttNetSourceLogger _sourceEventLogger;
+        
+        MqttNetEventLogger _eventLoggerNoListener;
+        MqttNetSourceLogger _sourceEventLoggerNoListener;
+        
+        bool _useHandler;
+
+        [GlobalSetup]
+        public void Setup()
+        {
+            _nullLogger = new MqttNetNullLogger();
+            _sourceNullLogger = _nullLogger.WithSource("Source");
+            
+            _eventLogger = new MqttNetEventLogger();
+            _eventLogger.LogMessagePublished += OnLogMessagePublished;
+            _sourceEventLogger = _eventLogger.WithSource("Source");
+            
+            _eventLoggerNoListener = new MqttNetEventLogger();
+            _sourceEventLoggerNoListener = _eventLoggerNoListener.WithSource("Source");
+        }
+
+        void OnLogMessagePublished(object sender, MqttNetLogMessagePublishedEventArgs eventArgs)
+        {
+            if (_useHandler)
+            {
+                eventArgs.LogMessage.ToString();
+            }
+        }
+
+        [Benchmark]
+        public void Log_10000_Messages_No_Listener()
+        {
+            _useHandler = false;
+            
+            for (var i = 0; i < 10000; i++)
+            {
+                _sourceEventLoggerNoListener.Verbose("test log message {0}", "parameter");
+            }
+        }
+
+        [Benchmark]
+        public void Log_10000_Messages_With_To_String()
+        {
+            _useHandler = true;
+            
+            for (var i = 0; i < 10000; i++)
+            {
+                _sourceEventLogger.Verbose("test log message {0}", "parameter");
+            }
+        }
+        
+        [Benchmark]
+        public void Log_10000_Messages_Without_To_String()
+        {
+            _useHandler = false;
+            
+            for (var i = 0; i < 10000; i++)
+            {
+                _sourceEventLogger.Verbose("test log message {0}", "parameter");
+            }
+        }
+        
+        [Benchmark]
+        public void Log_10000_Messages_With_NullLogger()
+        {
+            for (var i = 0; i < 10000; i++)
+            {
+                _sourceNullLogger.Verbose("test log message {0}", "parameter");
+            }
+        }
+    }
+}

Source/MQTTnet.Benchmarks/MQTTnet.Benchmarks.csproj

@@ -0,0 +1,39 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <DebugType>Full</DebugType>
+        <TargetFrameworks>net5.0;net6.0</TargetFrameworks>
+        <LangVersion>7.2</LangVersion>
+        <IsPackable>false</IsPackable>
+        <EnableNETAnalyzers>false</EnableNETAnalyzers>
+        <EnforceCodeStyleInBuild>false</EnforceCodeStyleInBuild>
+        <DisableImplicitAspNetCoreAnalyzers>true</DisableImplicitAspNetCoreAnalyzers>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="BenchmarkDotNet" Version="0.13.1" />
+        <PackageReference Include="Microsoft.AspNetCore" Version="2.2.0" />
+    </ItemGroup>
+
+    <ItemGroup Condition="'$(TargetFramework)' != 'net5.0'">
+        <PackageReference Include="System.IO.Pipelines" Version="4.7.2" />
+    </ItemGroup>
+
+    <ItemGroup Condition="'$(TargetFramework)' == 'net5.0'">
+        <PackageReference Include="System.IO.Pipelines" Version="5.0.0" />
+    </ItemGroup>
+
+    <ItemGroup Condition="'$(TargetFramework)' == 'net6.0'">
+        <PackageReference Include="System.IO.Pipelines" Version="5.0.0" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\..\Source\MQTTnet.AspnetCore\MQTTnet.AspNetCore.csproj" />
+
+        <PackageReference Include="Microsoft.CodeAnalysis.Compilers" Version="4.0.1" />
+        <PackageReference Include="Microsoft.Net.Compilers" Version="4.0.1" />
+        <ProjectReference Include="..\MQTTnet.Tests\MQTTnet.Tests.csproj" />
+    </ItemGroup>
+
+</Project>

Source/MQTTnet.Benchmarks/MessageDeliveryBenchmark.cs

@@ -0,0 +1,234 @@
+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Jobs;
+using MQTTnet.Client;
+using MQTTnet.Server;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+
+namespace MQTTnet.Benchmarks
+{
+    /// <summary>
+    /// Create a number of topics, publish, subscribe, and wait for response
+    /// </summary>
+    [MemoryDiagnoser]
+    public class MessageDeliveryBenchmark
+    {
+        List<MqttApplicationMessage> _topicPublishMessages;
+
+        [Params(1, 5)]
+        public int NumTopicsPerPublisher;
+
+        [Params(1000, 10000)]
+        public int NumPublishers;
+
+        [Params(10)]
+        public int NumSubscribers;
+
+        [Params(5, 10, 20, 50)]
+        public int NumSubscribedTopicsPerSubscriber;
+
+        object _lockMsgCount;
+        int _messagesReceivedCount;
+        int _messagesExpectedCount;
+        CancellationTokenSource _cancellationTokenSource;
+
+        MqttServer _mqttServer;
+        List<IMqttClient> _mqttSubscriberClients;
+        Dictionary<string, IMqttClient> _mqttPublisherClientsByPublisherName;
+
+        Dictionary<string, List<string>> _topicsByPublisher;
+        Dictionary<string, string> _publisherByTopic;        
+        List<string> _allSubscribedTopics; // Keep track of the subset of topics that are subscribed
+
+
+        [GlobalSetup]
+        public void Setup()
+        {
+            _lockMsgCount = new object();
+
+            Dictionary<string, List<string>> singleWildcardTopicsByPublisher;
+            Dictionary<string, List<string>> multiWildcardTopicsByPublisher;
+
+            TopicGenerator.Generate(NumPublishers, NumTopicsPerPublisher, out _topicsByPublisher, out singleWildcardTopicsByPublisher, out multiWildcardTopicsByPublisher);
+
+            var topics = _topicsByPublisher.First().Value;
+            _topicPublishMessages = new List<MqttApplicationMessage>();
+            // Prepare messages, same for each publisher
+            foreach (var topic in topics)
+            {
+                var message = new MqttApplicationMessageBuilder()
+                    .WithTopic(topic)
+                    .WithPayload(new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 })
+                    .Build();
+                _topicPublishMessages.Add(message);
+            }
+
+            // Create server
+            var factory = new MqttFactory();
+            var serverOptions = new MqttServerOptionsBuilder().WithDefaultEndpoint().Build();
+            _mqttServer = factory.CreateMqttServer(serverOptions);
+            _mqttServer.StartAsync().GetAwaiter().GetResult();
+
+            // Create publisher clients
+            _mqttPublisherClientsByPublisherName = new Dictionary<string, IMqttClient>();
+            foreach (var pt in _topicsByPublisher)
+            {
+                var publisherName = pt.Key;
+                var mqttClient = factory.CreateMqttClient();
+                var publisherOptions = new MqttClientOptionsBuilder()
+                    .WithTcpServer("localhost")
+                    .WithClientId(publisherName)
+                    .WithKeepAlivePeriod(TimeSpan.FromSeconds(30))
+                    .Build();
+                mqttClient.ConnectAsync(publisherOptions).GetAwaiter().GetResult();
+                _mqttPublisherClientsByPublisherName.Add(publisherName, mqttClient);
+            }
+
+            // Create subscriber clients
+            _mqttSubscriberClients = new List<IMqttClient>();
+            for (var i = 0; i < NumSubscribers; i++)
+            {
+                var mqttSubscriberClient = factory.CreateMqttClient();
+                _mqttSubscriberClients.Add(mqttSubscriberClient);
+
+                var subscriberOptions = new MqttClientOptionsBuilder()
+                       .WithTcpServer("localhost")
+                       .WithClientId("subscriber" + i)
+                       .Build();
+                mqttSubscriberClient.ApplicationMessageReceivedAsync += r =>
+                {
+                    // count messages and signal cancellation when expected message count is reached
+                    lock (_lockMsgCount)
+                    {
+                        ++_messagesReceivedCount;
+                        if (_messagesReceivedCount == _messagesExpectedCount)
+                        {
+                            _cancellationTokenSource.Cancel();
+                        }
+                    }
+                    return Task.CompletedTask;
+                };
+                mqttSubscriberClient.ConnectAsync(subscriberOptions).GetAwaiter().GetResult();
+            }
+
+
+            List<string> allTopics = new List<string>();
+            _publisherByTopic = new Dictionary<string, string>();
+            foreach (var t in _topicsByPublisher)
+            {
+                foreach (var topic in t.Value)
+                {
+                    _publisherByTopic.Add(topic, t.Key);
+                    allTopics.Add(topic);
+                }
+            }
+
+            // Subscribe to NumSubscribedTopics topics spread across all topics
+            _allSubscribedTopics = new List<string>();
+
+            var totalNumTopics = NumPublishers * NumTopicsPerPublisher;
+            int topicIndexStep = totalNumTopics / (NumSubscribedTopicsPerSubscriber * NumSubscribers);
+            if (topicIndexStep * NumSubscribedTopicsPerSubscriber * NumSubscribers != totalNumTopics)
+            {
+                throw new System.Exception(
+                    String.Format("The total number of topics must be divisible by the number of subscribed topics across all subscribers. Total number of topics: {0}, topic step: {1}", 
+                    totalNumTopics, topicIndexStep
+                    ));
+            }
+
+            var topicIndex = 0;
+            foreach (var mqttSubscriber in _mqttSubscriberClients)
+            {
+                for (var i = 0; i < NumSubscribedTopicsPerSubscriber; ++i, topicIndex += topicIndexStep)
+                {
+                    var topic = allTopics[topicIndex];
+                    _allSubscribedTopics.Add(topic);
+                    var subOptions = new Client.MqttClientSubscribeOptionsBuilder().WithTopicFilter(
+                        new Packets.MqttTopicFilter() { Topic = topic })
+                        .Build();
+                    mqttSubscriber.SubscribeAsync(subOptions).GetAwaiter().GetResult();
+                }
+            }
+
+            Task.Delay(1000).GetAwaiter().GetResult();
+        }
+
+        /// <summary>
+        /// Publish messages and wait for messages sent to subscribers
+        /// </summary>
+        [Benchmark]
+        public void DeliverMessages()
+        {
+            // There should be one message received per publish for each subscribed topic
+            _messagesExpectedCount = NumSubscribedTopicsPerSubscriber * NumSubscribers;
+
+            // Loop for a while and exchange messages
+
+            _messagesReceivedCount = 0;
+
+            _cancellationTokenSource = new CancellationTokenSource();
+
+            // same payload for all messages
+            var payload = new byte[] { 1, 2, 3, 4 };
+
+            var tasks = new List<Task>();
+
+            // publish a message for each subscribed topic
+            foreach (var topic in _allSubscribedTopics)
+            {
+                var message = new MqttApplicationMessageBuilder()
+                    .WithTopic(topic)
+                    .WithPayload(payload)
+                    .Build();
+                // pick the correct publisher
+                var publisherName = _publisherByTopic[topic];
+                var publisherClient = _mqttPublisherClientsByPublisherName[publisherName];
+                _ = publisherClient.PublishAsync(message);
+            }
+      
+            // Wait one message per publish to be received by subscriber (in the subscriber's application message handler)
+            try
+            {
+                Task.Delay(30000, _cancellationTokenSource.Token).GetAwaiter().GetResult();
+            }
+            catch
+            {
+
+            }
+
+            _cancellationTokenSource.Dispose();
+
+            if (_messagesReceivedCount < _messagesExpectedCount)
+            {
+                throw new Exception(string.Format("Messages Received Count mismatch, expected {0}, received {1}", _messagesExpectedCount, _messagesReceivedCount));
+            }
+        }
+
+        [GlobalCleanup]
+        public void Cleanup()
+        {
+            foreach (var mp in _mqttPublisherClientsByPublisherName)
+            {
+                var mqttPublisherClient = mp.Value;
+                mqttPublisherClient.DisconnectAsync().GetAwaiter().GetResult();
+                mqttPublisherClient.Dispose();
+            }
+            _mqttPublisherClientsByPublisherName.Clear();
+
+            foreach (var mqttSubscriber in _mqttSubscriberClients)
+            {
+                mqttSubscriber.DisconnectAsync().GetAwaiter().GetResult();
+                mqttSubscriber.Dispose();
+            }
+            _mqttSubscriberClients.Clear();
+
+            _mqttServer.StopAsync().GetAwaiter().GetResult();
+            _mqttServer.Dispose();
+            _mqttServer = null;
+        }
+    }
+}

Source/MQTTnet.Benchmarks/MessageProcessingBenchmark.cs

@@ -1,29 +1,33 @@
-using BenchmarkDotNet.Attributes;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using BenchmarkDotNet.Attributes;
 using BenchmarkDotNet.Jobs;
 using MQTTnet.Client;
-using MQTTnet.Client.Options;
 using MQTTnet.Server;
 
 namespace MQTTnet.Benchmarks
 {
-    [SimpleJob(RuntimeMoniker.Net461)]
+    [SimpleJob(RuntimeMoniker.Net60)]
     [RPlotExporter, RankColumn]
     [MemoryDiagnoser]
     public class MessageProcessingBenchmark
     {
-        private IMqttServer _mqttServer;
-        private IMqttClient _mqttClient;
-        private MqttApplicationMessage _message;
+        MqttServer _mqttServer;
+        IMqttClient _mqttClient;
+        MqttApplicationMessage _message;
 
         [GlobalSetup]
         public void Setup()
         {
+            var serverOptions = new MqttServerOptionsBuilder().Build();
+            
             var factory = new MqttFactory();
-            _mqttServer = factory.CreateMqttServer();
+            _mqttServer = factory.CreateMqttServer(serverOptions);
             _mqttClient = factory.CreateMqttClient();
 
-            var serverOptions = new MqttServerOptionsBuilder().Build();
-            _mqttServer.StartAsync(serverOptions).GetAwaiter().GetResult();
+            _mqttServer.StartAsync().GetAwaiter().GetResult();
 
             var clientOptions = new MqttClientOptionsBuilder()
                 .WithTcpServer("localhost").Build();

Source/MQTTnet.Benchmarks/MessageProcessingMqttConnectionContextBenchmark.cs

@@ -1,25 +1,25 @@
-using BenchmarkDotNet.Attributes;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Jobs;
 using MQTTnet.Client;
-
-
-using MQTTnet.AspNetCore;
-
 using Microsoft.AspNetCore;
 using Microsoft.AspNetCore.Hosting;
-using MQTTnet.Server;
-using MQTTnet.Diagnostics;
 using MQTTnet.AspNetCore.Client;
-using MQTTnet.AspNetCore.Extensions;
-using MQTTnet.Client.Options;
+using MQTTnet.AspNetCore;
+using MQTTnet.Diagnostics;
 
 namespace MQTTnet.Benchmarks
 {
+    [SimpleJob(RuntimeMoniker.Net60)]
     [MemoryDiagnoser]
     public class MessageProcessingMqttConnectionContextBenchmark
     {
-        private IWebHost _host;
-        private IMqttClient _mqttClient;
-        private MqttApplicationMessage _message;
+        IWebHost _host;
+        IMqttClient _mqttClient;
+        MqttApplicationMessage _message;
 
         [GlobalSetup]
         public void Setup()
@@ -39,7 +39,7 @@ namespace MQTTnet.Benchmarks
                    .Build();
 
             var factory = new MqttFactory();
-            _mqttClient = factory.CreateMqttClient(new MqttNetLogger(), new MqttClientConnectionContextFactory());
+            _mqttClient = factory.CreateMqttClient(new MqttNetEventLogger(), new MqttClientConnectionContextFactory());
 
             _host.StartAsync().GetAwaiter().GetResult();
 

Source/MQTTnet.Benchmarks/MqttPacketReaderWriterBenchmark.cs

@@ -0,0 +1,93 @@
+using System;
+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Jobs;
+using MQTTnet.AspNetCore;
+using MQTTnet.Formatter;
+using MQTTnet.Tests.Mockups;
+
+namespace MQTTnet.Benchmarks
+{
+    [SimpleJob(RuntimeMoniker.Net60)]
+    [MemoryDiagnoser]
+    public class MqttPacketReaderWriterBenchmark
+    {
+        readonly byte[] _demoPayload = new byte[1024];
+        
+        byte[] _readPayload;
+
+        [GlobalCleanup]
+        public void GlobalCleanup()
+        {
+        }
+
+        [GlobalSetup]
+        public void GlobalSetup()
+        {
+            TestEnvironment.EnableLogger = false;
+            
+            var writer = new MqttBufferWriter(4096, 65535);
+            writer.WriteString("A relative short string.");
+            writer.WriteBinaryData(_demoPayload);
+            writer.WriteByte(0x01);
+            writer.WriteByte(0x02);
+            writer.WriteVariableByteInteger(5647382);
+            writer.WriteString("A relative short string.");
+            writer.WriteVariableByteInteger(8574489);
+            writer.WriteBinaryData(_demoPayload);
+            writer.WriteByte(2);
+            writer.WriteByte(0x02);
+            writer.WriteString("fjgffiogfhgfhoihgoireghreghreguhreguireoghreouighreouighreughreguiorehreuiohruiorehreuioghreug");
+            writer.WriteBinaryData(_demoPayload);
+
+            _readPayload = new ArraySegment<byte>(writer.GetBuffer(), 0, writer.Length).ToArray();
+        }
+
+        [Benchmark]
+        public void Read_100_000_Messages()
+        {
+            var reader = new MqttBufferReader();
+            reader.SetBuffer(_readPayload, 0, _readPayload.Length);
+
+            for (var i = 0; i < 100000; i++)
+            {
+                reader.Seek(0);
+
+                reader.ReadString();
+                reader.ReadBinaryData();
+                reader.ReadByte();
+                reader.ReadByte();
+                reader.ReadVariableByteInteger();
+                reader.ReadString();
+                reader.ReadVariableByteInteger();
+                reader.ReadBinaryData();
+                reader.ReadByte();
+                reader.ReadByte();
+                reader.ReadString();
+                reader.ReadBinaryData();
+            }
+        }
+        
+        [Benchmark]
+        public void Write_100_000_Messages()
+        {
+            var writer = new MqttBufferWriter(4096, 65535);
+
+            for (var i = 0; i < 100000; i++)
+            {
+                writer.WriteString("A relative short string.");
+                writer.WriteByte(0x01);
+                writer.WriteByte(0x02);
+                writer.WriteVariableByteInteger(5647382);
+                writer.WriteString("A relative short string.");
+                writer.WriteVariableByteInteger(8574589);
+                writer.WriteBinaryData(_demoPayload);
+                writer.WriteByte(2);
+                writer.WriteByte(0x02);
+                writer.WriteString("fjgffiogfhgfhoihgoireghreghreguhreguireoghreouighreouighreughreguiorehreuiohruiorehreuioghreug");
+                writer.WriteBinaryData(_demoPayload);
+
+                writer.Reset(0);
+            }
+        }
+    }
+}

Source/MQTTnet.Benchmarks/MqttTcpChannelBenchmark.cs

@@ -1,26 +1,32 @@
-using BenchmarkDotNet.Attributes;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using BenchmarkDotNet.Attributes;
 using MQTTnet.Channel;
-using MQTTnet.Client.Options;
-using MQTTnet.Diagnostics;
 using MQTTnet.Implementations;
 using MQTTnet.Server;
 using System.Threading;
 using System.Threading.Tasks;
+using BenchmarkDotNet.Jobs;
+using MQTTnet.Client;
+using MQTTnet.Diagnostics;
 
 namespace MQTTnet.Benchmarks
 {
+    [SimpleJob(RuntimeMoniker.Net60)]
     [MemoryDiagnoser]
-    public class MqttTcpChannelBenchmark
+    public sealed class MqttTcpChannelBenchmark
     {
-        private IMqttServer _mqttServer;
-        private IMqttChannel _serverChannel;
-        private IMqttChannel _clientChannel;
+        MqttServer _mqttServer;
+        IMqttChannel _serverChannel;
+        IMqttChannel _clientChannel;
 
         [GlobalSetup]
         public void Setup()
         {
             var factory = new MqttFactory();
-            var tcpServer = new MqttTcpServerAdapter(new MqttNetLogger());
+            var tcpServer = new MqttTcpServerAdapter();
             tcpServer.ClientHandler += args =>
             {
                 _serverChannel =
@@ -31,10 +37,11 @@ namespace MQTTnet.Benchmarks
                 return Task.CompletedTask;
             };
 
-            _mqttServer = factory.CreateMqttServer(new[] { tcpServer }, new MqttNetLogger());
-
             var serverOptions = new MqttServerOptionsBuilder().Build();
-            _mqttServer.StartAsync(serverOptions).GetAwaiter().GetResult();
+            _mqttServer = factory.CreateMqttServer(serverOptions, new[] { tcpServer }, new MqttNetEventLogger());
+
+            
+            _mqttServer.StartAsync().GetAwaiter().GetResult();
 
             var clientOptions = new MqttClientOptionsBuilder()
                 .WithTcpServer("localhost").Build();
@@ -54,7 +61,7 @@ namespace MQTTnet.Benchmarks
             await Task.WhenAll(WriteAsync(iterations, size), ReadAsync(iterations, size));
         }
 
-        private async Task ReadAsync(int iterations, int size)
+        async Task ReadAsync(int iterations, int size)
         {
             await Task.Yield();
 
@@ -68,7 +75,7 @@ namespace MQTTnet.Benchmarks
             }
         }
 
-        private async Task WriteAsync(int iterations, int size)
+        async Task WriteAsync(int iterations, int size)
         {
             await Task.Yield();
 
@@ -78,4 +85,4 @@ namespace MQTTnet.Benchmarks
             }
         }
     }
-}
+}

Source/MQTTnet.Benchmarks/Program.cs

@@ -1,4 +1,8 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
 using BenchmarkDotNet.Running;
 using MQTTnet.Benchmarks.Configurations;
 using MQTTnet.Diagnostics;
@@ -9,7 +13,8 @@ namespace MQTTnet.Benchmarks
     {
         public static void Main(string[] args)
         {
-            Console.WriteLine($"MQTTnet - BenchmarkApp.{TargetFrameworkProvider.TargetFramework}");
+            Console.WriteLine($"MQTTnet - Benchmarks ({TargetFrameworkProvider.TargetFramework})");
+            Console.WriteLine("--------------------------------------------------------");
             Console.WriteLine("1 = MessageProcessingBenchmark");
             Console.WriteLine("2 = SerializerBenchmark");
             Console.WriteLine("3 = LoggerBenchmark");
@@ -18,6 +23,12 @@ namespace MQTTnet.Benchmarks
             Console.WriteLine("6 = MqttTcpChannelBenchmark");
             Console.WriteLine("7 = TcpPipesBenchmark");
             Console.WriteLine("8 = MessageProcessingMqttConnectionContextBenchmark");
+            Console.WriteLine("9 = ServerProcessingBenchmark");
+            Console.WriteLine("a = MqttPacketReaderWriterBenchmark");
+            Console.WriteLine("b = RoundtripBenchmark");
+            Console.WriteLine("c = SubscribeBenchmark");
+            Console.WriteLine("d = UnsubscribeBenchmark");
+            Console.WriteLine("e = MessageDeliveryBenchmark");
 
             var pressedKey = Console.ReadKey(true);
             switch (pressedKey.KeyChar)
@@ -44,7 +55,25 @@ namespace MQTTnet.Benchmarks
                     BenchmarkRunner.Run<TcpPipesBenchmark>();
                     break;
                 case '8':
-                    BenchmarkRunner.Run<MessageProcessingMqttConnectionContextBenchmark>(new RuntimeCompareConfig()/*new AllowNonOptimized()*/);
+                    BenchmarkRunner.Run<MessageProcessingMqttConnectionContextBenchmark>(new RuntimeCompareConfig());
+                    break;
+                case '9':
+                    BenchmarkRunner.Run<ServerProcessingBenchmark>();
+                    break;
+                case 'a':
+                    BenchmarkRunner.Run(typeof(MqttPacketReaderWriterBenchmark));
+                    break;
+                case 'b':
+                    BenchmarkRunner.Run<RoundtripProcessingBenchmark>();
+                    break;
+                case 'c':
+                    BenchmarkRunner.Run<SubscribeBenchmark>();
+                    break;
+                case 'd':
+                    BenchmarkRunner.Run<UnsubscribeBenchmark>();
+                    break;
+                case 'e':
+                    BenchmarkRunner.Run<MessageDeliveryBenchmark>();
                     break;
             }
 

Source/MQTTnet.Benchmarks/RoundtripProcessingBenchmark.cs

@@ -0,0 +1,30 @@
+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Jobs;
+using MQTTnet.Tests.Mockups;
+using MQTTnet.Tests.Server;
+
+namespace MQTTnet.Benchmarks
+{
+    [SimpleJob(RuntimeMoniker.Net60)]
+    [RPlotExporter, RankColumn]
+    [MemoryDiagnoser]
+    public class RoundtripProcessingBenchmark
+    {
+        [GlobalSetup]
+        public void GlobalSetup()
+        {
+            TestEnvironment.EnableLogger = false;
+        }
+        
+        [GlobalCleanup]
+        public void GlobalCleanup()
+        {
+        }
+        
+        [Benchmark]
+        public void Handle_100_000_Messages_In_Receiving_Client()
+        {
+            new Load_Tests().Handle_100_000_Messages_In_Receiving_Client().GetAwaiter().GetResult();
+        }
+    }
+}

Source/MQTTnet.Benchmarks/SerializerBenchmark.cs

@@ -1,4 +1,8 @@
-using BenchmarkDotNet.Attributes;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using BenchmarkDotNet.Attributes;
 using MQTTnet.Packets;
 using System;
 using System.Security.Cryptography.X509Certificates;
@@ -9,28 +13,31 @@ using MQTTnet.Channel;
 using MQTTnet.Formatter;
 using MQTTnet.Formatter.V3;
 using BenchmarkDotNet.Jobs;
+using MQTTnet.Diagnostics;
 
 namespace MQTTnet.Benchmarks
 {
-    [SimpleJob(RuntimeMoniker.Net461)]
+    [SimpleJob(RuntimeMoniker.Net60)]
     [RPlotExporter]
     [MemoryDiagnoser]
-    public class SerializerBenchmark
+    public class SerializerBenchmark : BaseBenchmark
     {
-        private MqttBasePacket _packet;
-        private ArraySegment<byte> _serializedPacket;
-        private IMqttPacketFormatter _serializer;
+        MqttPacket _packet;
+        ArraySegment<byte> _serializedPacket;
+        IMqttPacketFormatter _serializer;
+        MqttBufferWriter _bufferWriter;
 
         [GlobalSetup]
-        public void Setup()
+        public void GlobalSetup()
         {
             _packet = new MqttPublishPacket
             {
                 Topic = "A"
             };
 
-            _serializer = new MqttV311PacketFormatter(new MqttPacketWriter());
-            _serializedPacket = _serializer.Encode(_packet);
+            _bufferWriter = new MqttBufferWriter(4096, 65535);
+            _serializer = new MqttV3PacketFormatter(_bufferWriter, MqttProtocolVersion.V311);
+            _serializedPacket = _serializer.Encode(_packet).Join();
         }
 
         [Benchmark]
@@ -39,7 +46,7 @@ namespace MQTTnet.Benchmarks
             for (var i = 0; i < 10000; i++)
             {
                 _serializer.Encode(_packet);
-                _serializer.FreeBuffer();
+                _bufferWriter.Cleanup();
             }
         }
 
@@ -47,27 +54,20 @@ namespace MQTTnet.Benchmarks
         public void Deserialize_10000_Messages()
         {
             var channel = new BenchmarkMqttChannel(_serializedPacket);
-            var fixedHeader = new byte[2];
-            var reader = new MqttPacketReader(channel);
+            var reader = new MqttChannelAdapter(channel, new MqttPacketFormatterAdapter(new MqttBufferWriter(4096, 65535)), null, new MqttNetEventLogger());
 
             for (var i = 0; i < 10000; i++)
             {
                 channel.Reset();
 
-                var header = reader.ReadFixedHeaderAsync(fixedHeader, CancellationToken.None).GetAwaiter().GetResult().FixedHeader;
-
-                var receivedPacket = new ReceivedMqttPacket(
-                    header.Flags,
-                    new MqttPacketBodyReader(_serializedPacket.Array, _serializedPacket.Count - header.RemainingLength, _serializedPacket.Array.Length), 0);
-
-                _serializer.Decode(receivedPacket);
+                var header = reader.ReceivePacketAsync(CancellationToken.None).GetAwaiter().GetResult();
             }
         }
 
-        private class BenchmarkMqttChannel : IMqttChannel
+        class BenchmarkMqttChannel : IMqttChannel
         {
-            private readonly ArraySegment<byte> _buffer;
-            private int _position;
+            readonly ArraySegment<byte> _buffer;
+            int _position;
 
             public BenchmarkMqttChannel(ArraySegment<byte> buffer)
             {

Source/MQTTnet.Benchmarks/ServerProcessingBenchmark.cs

@@ -0,0 +1,36 @@
+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Jobs;
+using MQTTnet.Tests.Mockups;
+using MQTTnet.Tests.Server;
+
+namespace MQTTnet.Benchmarks
+{
+    [SimpleJob(RuntimeMoniker.Net60)]
+    [RPlotExporter, RankColumn]
+    [MemoryDiagnoser]
+    public class ServerProcessingBenchmark
+    {
+        [GlobalSetup]
+        public void GlobalSetup()
+        {
+            TestEnvironment.EnableLogger = false;
+        }
+        
+        [GlobalCleanup]
+        public void GlobalCleanup()
+        {
+        }
+        
+        [Benchmark]
+        public void Handle_100_000_Messages_In_Server_MqttClient()
+        {
+            new Load_Tests().Handle_100_000_Messages_In_Server().GetAwaiter().GetResult();
+        }
+        
+        //[Benchmark]
+        public void Handle_100_000_Messages_In_Server_LowLevelMqttClient()
+        {
+            new Load_Tests().Handle_100_000_Messages_In_Low_Level_Client().GetAwaiter().GetResult();
+        }
+    }
+}

Source/MQTTnet.Benchmarks/SubscribeBenchmark.cs

@@ -0,0 +1,62 @@
+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Jobs;
+using MQTTnet.Client;
+using MQTTnet.Server;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace MQTTnet.Benchmarks
+{
+    [MemoryDiagnoser]
+    public class SubscribeBenchmark
+    {
+        MqttServer _mqttServer;
+        IMqttClient _mqttClient;
+
+        const int NumPublishers = 1;
+        const int NumTopicsPerPublisher = 10000;
+
+        List<string> _topics;
+
+        [GlobalSetup]
+        public void Setup()
+        {
+            TopicGenerator.Generate(NumPublishers, NumTopicsPerPublisher, out var topicsByPublisher, out var singleWildcardTopicsByPublisher, out var multiWildcardTopicsByPublisher);
+            _topics = topicsByPublisher.Values.First();
+
+            var serverOptions = new MqttServerOptionsBuilder().WithDefaultEndpoint().Build();
+
+            var factory = new MqttFactory();
+            _mqttServer = factory.CreateMqttServer(serverOptions);
+            _mqttClient = factory.CreateMqttClient();
+
+            _mqttServer.StartAsync().GetAwaiter().GetResult();
+
+            var clientOptions = new MqttClientOptionsBuilder()
+                .WithTcpServer("localhost").Build();
+
+            _mqttClient.ConnectAsync(clientOptions).GetAwaiter().GetResult();
+        }
+
+        [GlobalCleanup]
+        public void Cleanup()
+        {
+            _mqttClient.DisconnectAsync().GetAwaiter().GetResult();
+            _mqttServer.StopAsync().GetAwaiter().GetResult();
+            _mqttServer.Dispose();
+        }
+
+        [Benchmark]
+        public void Subscribe_10000_Topics()
+        {
+            foreach (var topic in _topics)
+            {
+                var subscribeOptions = new MqttClientSubscribeOptionsBuilder()
+                       .WithTopicFilter(topic, Protocol.MqttQualityOfServiceLevel.AtMostOnce)
+                       .Build();
+                
+                _mqttClient.SubscribeAsync(subscribeOptions).GetAwaiter().GetResult();
+            }
+        }
+    }
+}

Source/MQTTnet.Benchmarks/TcpPipesBenchmark.cs

@@ -1,18 +1,24 @@
-using System.IO.Pipelines;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.IO.Pipelines;
 using System.Net;
 using System.Net.Sockets;
 using System.Threading;
 using System.Threading.Tasks;
 using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Jobs;
 using MQTTnet.AspNetCore.Client.Tcp;
 
 namespace MQTTnet.Benchmarks
 {
+    [SimpleJob(RuntimeMoniker.Net60)]
     [MemoryDiagnoser]
     public class TcpPipesBenchmark
     {
-        private IDuplexPipe _client;
-        private IDuplexPipe _server;
+        IDuplexPipe _client;
+        IDuplexPipe _server;
 
         [GlobalSetup]
         public void Setup()
@@ -43,7 +49,7 @@ namespace MQTTnet.Benchmarks
             await Task.WhenAll(WriteAsync(iterations, size), ReadAsync(iterations, size));
         }
 
-        private async Task ReadAsync(int iterations, int size)
+        async Task ReadAsync(int iterations, int size)
         {
             await Task.Yield();
 
@@ -59,7 +65,7 @@ namespace MQTTnet.Benchmarks
             }
         }
 
-        private async Task WriteAsync(int iterations, int size)
+        async Task WriteAsync(int iterations, int size)
         {
             await Task.Yield();
 

Source/MQTTnet.Benchmarks/TopicFilterComparerBenchmark.cs

@@ -0,0 +1,277 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Jobs;
+
+namespace MQTTnet.Benchmarks
+{
+    [SimpleJob(RuntimeMoniker.Net60)]
+    [RPlotExporter]
+    [MemoryDiagnoser]
+    public class TopicFilterComparerBenchmark
+    {
+        static readonly char[] TopicLevelSeparator = { '/' };
+
+        readonly string _longTopic =
+            "AAAAAAAAAAAAAssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssshhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkAAAAAAAAAAAAAAABBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC";
+
+        [Benchmark]
+        public void MqttTopicFilterComparer_10000_LoopMethod()
+        {
+            for (var i = 0; i < 100000; i++)
+            {
+                MqttTopicFilterComparer.Compare("sport/tennis/player1", "sport/#");
+                MqttTopicFilterComparer.Compare("sport/tennis/player1/ranking", "sport/#/ranking");
+                MqttTopicFilterComparer.Compare("sport/tennis/player1/score/wimbledon", "sport/+/player1/#");
+                MqttTopicFilterComparer.Compare("sport/tennis/player1", "sport/tennis/+");
+                MqttTopicFilterComparer.Compare("/finance", "+/+");
+                MqttTopicFilterComparer.Compare("/finance", "/+");
+                MqttTopicFilterComparer.Compare("/finance", "+");
+                MqttTopicFilterComparer.Compare(_longTopic, _longTopic);
+            }
+        }
+
+        [Benchmark]
+        public void MqttTopicFilterComparer_10000_LoopMethod_Without_Pointer()
+        {
+            for (var i = 0; i < 100000; i++)
+            {
+                MqttTopicFilterComparerWithoutPointer.Compare("sport/tennis/player1", "sport/#");
+                MqttTopicFilterComparerWithoutPointer.Compare("sport/tennis/player1/ranking", "sport/#/ranking");
+                MqttTopicFilterComparerWithoutPointer.Compare("sport/tennis/player1/score/wimbledon", "sport/+/player1/#");
+                MqttTopicFilterComparerWithoutPointer.Compare("sport/tennis/player1", "sport/tennis/+");
+                MqttTopicFilterComparerWithoutPointer.Compare("/finance", "+/+");
+                MqttTopicFilterComparerWithoutPointer.Compare("/finance", "/+");
+                MqttTopicFilterComparerWithoutPointer.Compare("/finance", "+");
+                MqttTopicFilterComparerWithoutPointer.Compare(_longTopic, _longTopic);
+            }
+        }
+
+        [Benchmark]
+        public void MqttTopicFilterComparer_10000_StringSplitMethod()
+        {
+            for (var i = 0; i < 100000; i++)
+            {
+                LegacyMethodByStringSplit("sport/tennis/player1", "sport/#");
+                LegacyMethodByStringSplit("sport/tennis/player1/ranking", "sport/#/ranking");
+                LegacyMethodByStringSplit("sport/tennis/player1/score/wimbledon", "sport/+/player1/#");
+                LegacyMethodByStringSplit("sport/tennis/player1", "sport/tennis/+");
+                LegacyMethodByStringSplit("/finance", "+/+");
+                LegacyMethodByStringSplit("/finance", "/+");
+                LegacyMethodByStringSplit("/finance", "+");
+                MqttTopicFilterComparer.Compare(_longTopic, _longTopic);
+            }
+        }
+
+        [GlobalSetup]
+        public void Setup()
+        {
+        }
+
+        static bool LegacyMethodByStringSplit(string topic, string filter)
+        {
+            if (topic == null)
+            {
+                throw new ArgumentNullException(nameof(topic));
+            }
+
+            if (filter == null)
+            {
+                throw new ArgumentNullException(nameof(filter));
+            }
+
+            if (string.Equals(topic, filter, StringComparison.Ordinal))
+            {
+                return true;
+            }
+
+            var fragmentsTopic = topic.Split(TopicLevelSeparator, StringSplitOptions.None);
+            var fragmentsFilter = filter.Split(TopicLevelSeparator, StringSplitOptions.None);
+
+            // # > In either case it MUST be the last character specified in the Topic Filter [MQTT-4.7.1-2].
+            for (var i = 0; i < fragmentsFilter.Length; i++)
+            {
+                if (fragmentsFilter[i] == "+")
+                {
+                    continue;
+                }
+
+                if (fragmentsFilter[i] == "#")
+                {
+                    return true;
+                }
+
+                if (i >= fragmentsTopic.Length)
+                {
+                    return false;
+                }
+
+                if (!string.Equals(fragmentsFilter[i], fragmentsTopic[i], StringComparison.Ordinal))
+                {
+                    return false;
+                }
+            }
+
+            return fragmentsTopic.Length == fragmentsFilter.Length;
+        }
+
+        public static class MqttTopicFilterComparerWithoutPointer
+        {
+            public const char LevelSeparator = '/';
+            public const char MultiLevelWildcard = '#';
+            public const char SingleLevelWildcard = '+';
+            public const char ReservedTopicPrefix = '$';
+
+            public static MqttTopicFilterCompareResult Compare(string topic, string filter)
+            {
+                if (string.IsNullOrEmpty(topic))
+                {
+                    return MqttTopicFilterCompareResult.TopicInvalid;
+                }
+
+                if (string.IsNullOrEmpty(filter))
+                {
+                    return MqttTopicFilterCompareResult.FilterInvalid;
+                }
+
+                var filterOffset = 0;
+                var filterLength = filter.Length;
+
+                var topicOffset = 0;
+                var topicLength = topic.Length;
+
+                var topicPointer = topic;
+                var filterPointer = filter;
+
+                var isMultiLevelFilter = filterPointer[filterLength - 1] == MultiLevelWildcard;
+                var isReservedTopic = topicPointer[0] == ReservedTopicPrefix;
+
+                if (isReservedTopic && filterLength == 1 && isMultiLevelFilter)
+                {
+                    // It is not allowed to receive i.e. '$foo/bar' with filter '#'.
+                    return MqttTopicFilterCompareResult.NoMatch;
+                }
+
+                if (isReservedTopic && filterPointer[0] == SingleLevelWildcard)
+                {
+                    // It is not allowed to receive i.e. '$SYS/monitor/Clients' with filter '+/monitor/Clients'.
+                    return MqttTopicFilterCompareResult.NoMatch;
+                }
+
+                if (filterLength == 1 && isMultiLevelFilter)
+                {
+                    // Filter '#' matches basically everything.
+                    return MqttTopicFilterCompareResult.IsMatch;
+                }
+
+                // Go through the filter char by char.
+                while (filterOffset < filterLength && topicOffset < topicLength)
+                {
+                    // Check if the current char is a multi level wildcard. The char is only allowed
+                    // at the very las position.
+                    if (filterPointer[filterOffset] == MultiLevelWildcard && filterOffset != filterLength - 1)
+                    {
+                        return MqttTopicFilterCompareResult.FilterInvalid;
+                    }
+
+                    if (filterPointer[filterOffset] == topicPointer[topicOffset])
+                    {
+                        if (topicOffset == topicLength - 1)
+                        {
+                            // Check for e.g. "foo" matching "foo/#"
+                            if (filterOffset == filterLength - 3 && filterPointer[filterOffset + 1] == LevelSeparator && isMultiLevelFilter)
+                            {
+                                return MqttTopicFilterCompareResult.IsMatch;
+                            }
+
+                            // Check for e.g. "foo/" matching "foo/#"
+                            if (filterOffset == filterLength - 2 && filterPointer[filterOffset] == LevelSeparator && isMultiLevelFilter)
+                            {
+                                return MqttTopicFilterCompareResult.IsMatch;
+                            }
+                        }
+
+                        filterOffset++;
+                        topicOffset++;
+
+                        // Check if the end was reached and i.e. "foo/bar" matches "foo/bar"
+                        if (filterOffset == filterLength && topicOffset == topicLength)
+                        {
+                            return MqttTopicFilterCompareResult.IsMatch;
+                        }
+
+                        var endOfTopic = topicOffset == topicLength;
+
+                        if (endOfTopic && filterOffset == filterLength - 1 && filterPointer[filterOffset] == SingleLevelWildcard)
+                        {
+                            if (filterOffset > 0 && filterPointer[filterOffset - 1] != LevelSeparator)
+                            {
+                                return MqttTopicFilterCompareResult.FilterInvalid;
+                            }
+
+                            return MqttTopicFilterCompareResult.IsMatch;
+                        }
+                    }
+                    else
+                    {
+                        if (filterPointer[filterOffset] == SingleLevelWildcard)
+                        {
+                            // Check for invalid "+foo" or "a/+foo" subscription
+                            if (filterOffset > 0 && filterPointer[filterOffset - 1] != LevelSeparator)
+                            {
+                                return MqttTopicFilterCompareResult.FilterInvalid;
+                            }
+
+                            // Check for bad "foo+" or "foo+/a" subscription
+                            if (filterOffset < filterLength - 1 && filterPointer[filterOffset + 1] != LevelSeparator)
+                            {
+                                return MqttTopicFilterCompareResult.FilterInvalid;
+                            }
+
+                            filterOffset++;
+                            while (topicOffset < topicLength && topicPointer[topicOffset] != LevelSeparator)
+                            {
+                                topicOffset++;
+                            }
+
+                            if (topicOffset == topicLength && filterOffset == filterLength)
+                            {
+                                return MqttTopicFilterCompareResult.IsMatch;
+                            }
+                        }
+                        else if (filterPointer[filterOffset] == MultiLevelWildcard)
+                        {
+                            if (filterOffset > 0 && filterPointer[filterOffset - 1] != LevelSeparator)
+                            {
+                                return MqttTopicFilterCompareResult.FilterInvalid;
+                            }
+
+                            if (filterOffset + 1 != filterLength)
+                            {
+                                return MqttTopicFilterCompareResult.FilterInvalid;
+                            }
+
+                            return MqttTopicFilterCompareResult.IsMatch;
+                        }
+                        else
+                        {
+                            // Check for e.g. "foo/bar" matching "foo/+/#".
+                            if (filterOffset > 0 && filterOffset + 2 == filterLength && topicOffset == topicLength && filterPointer[filterOffset - 1] == SingleLevelWildcard &&
+                                filterPointer[filterOffset] == LevelSeparator && isMultiLevelFilter)
+                            {
+                                return MqttTopicFilterCompareResult.IsMatch;
+                            }
+
+                            return MqttTopicFilterCompareResult.NoMatch;
+                        }
+                    }
+                }
+
+                return MqttTopicFilterCompareResult.NoMatch;
+            }
+        }
+    }
+}

Source/MQTTnet.Benchmarks/TopicGenerator.cs

@@ -0,0 +1,81 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace MQTTnet.Benchmarks
+{
+    public class TopicGenerator
+    {
+        public static void Generate(
+           int numPublishers, int numTopicsPerPublisher,
+           out Dictionary<string, List<string>> topicsByPublisher,
+           out Dictionary<string, List<string>> singleWildcardTopicsByPublisher,
+           out Dictionary<string, List<string>> multiWildcardTopicsByPublisher
+           )
+        {
+            topicsByPublisher = new Dictionary<string, List<string>>();
+            singleWildcardTopicsByPublisher = new Dictionary<string, List<string>>();
+            multiWildcardTopicsByPublisher = new Dictionary<string, List<string>>();
+
+            // Find some reasonable distribution across three topic levels
+            var topicsPerLevel = (int)Math.Pow(numTopicsPerPublisher, (1.0 / 3.0));
+            if (topicsPerLevel <= 0)
+            {
+                topicsPerLevel = 1;
+            }
+
+            int numLevel1Topics = topicsPerLevel;
+            int numLevel2Topics = topicsPerLevel;
+
+            var maxNumLevel3Topics = 1 + (int)((double)numTopicsPerPublisher / numLevel1Topics / numLevel2Topics);
+            if (maxNumLevel3Topics <= 0)
+            {
+                maxNumLevel3Topics = 1;
+            }
+
+            for (var p = 0; p < numPublishers; ++p)
+            {
+                int publisherTopicCount = 0;
+                var publisherName = "pub" + p;
+                for (var l1 = 0; l1 < numLevel1Topics; ++l1)
+                {
+                    for (var l2 = 0; l2 < numLevel2Topics; ++l2)
+                    {
+                        for (var l3 = 0; l3 < maxNumLevel3Topics; ++l3)
+                        {
+                            if (publisherTopicCount >= numTopicsPerPublisher)
+                                break;
+
+                            var topic = string.Format("{0}/building{1}/level{2}/sensor{3}", publisherName, l1 + 1, l2 + 1, l3 + 1);
+                            AddPublisherTopic(publisherName, topic, topicsByPublisher);
+
+                            if (l2 == 0)
+                            {
+                                var singleWildcardTopic = string.Format("{0}/building{1}/+/sensor{2}", publisherName, l1 + 1, l3 + 1);
+                                AddPublisherTopic(publisherName, singleWildcardTopic, singleWildcardTopicsByPublisher);
+                            }
+                            if ((l1 == 0) && (l3 == 0))
+                            {
+                                var multiWildcardTopic = string.Format("{0}/+/level{1}/+", publisherName, l2 + 1);
+                                AddPublisherTopic(publisherName, multiWildcardTopic, multiWildcardTopicsByPublisher);
+                            }
+
+                            ++publisherTopicCount;
+                        }
+                    }
+                }
+            }
+        }
+
+        static void AddPublisherTopic(string publisherName, string topic, Dictionary<string, List<string>> topicsByPublisher)
+        {
+            List<string> topicList;
+            if (!topicsByPublisher.TryGetValue(publisherName, out topicList))
+            {
+                topicList = new List<string>();
+                topicsByPublisher.Add(publisherName, topicList);
+            }
+            topicList.Add(topic);
+        }
+    }
+}