Fix null ref exception in low level client.

Fix UnitTests
Fix Unit Tests.
2026-10-15 00:15:15 +08:00 · 2020-08-05 20:49:11 +02:00 · 2020-07-26 20:07:52 +02:00 · 2020-07-26 12:01:33 +02:00 · 2020-07-25 23:47:29 +02:00 · 2020-07-25 23:34:30 +02:00
112 changed files with 2524 additions and 400 deletions
@@ -13,7 +13,7 @@
    <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</tags>
+    <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="$nugetVersion" />
@@ -13,7 +13,7 @@
    <description>This is an extension library which provides a managed MQTT client with additional features using MQTTnet.</description>
    <releaseNotes>For release notes please go to MQTTnet release notes (https://www.nuget.org/packages/MQTTnet/).</releaseNotes>
    <copyright>Copyright Christian Kratky 2016-2020</copyright>
-    <tags>MQTT Message Queue Telemetry Transport MQTTClient MQTTServer Server MQTTBroker Broker NETStandard IoT InternetOfThings Messaging Hardware Arduino Sensor Actuator M2M ESP Smart Home Cities Automation Xamarin</tags> 
+    <tags>MQTT Message Queue Telemetry Transport MQTTClient MQTTServer Server MQTTBroker Broker NETStandard IoT InternetOfThings Messaging Hardware Arduino Sensor Actuator M2M ESP Smart Home Cities Automation Xamarin Blazor</tags> 
    <dependencies>
      <dependency id="MQTTnet" version="$nugetVersion" />
    </dependencies>
@@ -13,7 +13,7 @@
    <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</tags> 
+    <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="$nugetVersion" />
    </dependencies>
@@ -13,7 +13,7 @@
    <description>This is an extension library which allows using _WebSocket4Net_ as transport for MQTTnet clients.</description>
    <releaseNotes>For release notes please go to MQTTnet release notes (https://www.nuget.org/packages/MQTTnet/).</releaseNotes>
    <copyright>Copyright Christian Kratky 2016-2020</copyright>
-    <tags>MQTT Message Queue Telemetry Transport MQTTClient MQTTServer Server MQTTBroker Broker NETStandard IoT InternetOfThings Messaging Hardware Arduino Sensor Actuator M2M ESP Smart Home Cities Automation Xamarin</tags> 
+    <tags>MQTT Message Queue Telemetry Transport MQTTClient MQTTServer Server MQTTBroker Broker NETStandard IoT InternetOfThings Messaging Hardware Arduino Sensor Actuator M2M ESP Smart Home Cities Automation Xamarin Blazor</tags> 
    <dependencies>
    <group targetFramework="netstandard1.3">
        <dependency id="MQTTnet" version="$nugetVersion" />
@@ -12,25 +12,19 @@
    <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>
-* [Core] Improved logger performance (BREAKING CHANGE!).
-* [Core] Renamed some topic filter relevant classes (BREAKING CHANGE!).
-* [Core] Improved task management for UWP connections (thanks to @xgstation).
-* [Core] Fixed broken logger which decreases overall performance.
-* [Core] Fixed issue in closed socket detection (fixes high CPU load issue).
-* [Client] Added method to trigger PING/PONG manually (connection check etc.).
-* [Client] Added support for certificate validation callback when using Web Sockets (requires netstandard2.1+).
-* [Client] Fixed a memory leak when web socket based connections trying to reconnect with an offline server.
-* [Client] Fixed a memory leak when TCP based connections trying to reconnect with an offline server.
-* [Client] Fixed an issue when connecting to an invalid host (format).
-* [Client] Added support for user properties in CONNECT packet.
-* [Client] Removed _KeepAliveSendInterval_ and improved keep alive handling (BREAKING CHANGE!).
-* [ManagedClient] Added method to trigger PING/PONG manually (connection check etc.).
-* [MQTTnet.AspNetCore] improved compatibility with AspNetCore 3.1.
-* [MQTTnet.AspNetCore] Fixed several packaging issues with the Nuget package.
-* [MQTTnet.Server] Fixed wrong version output.
+* [LowLevelClient] Fixed a null reference exception when connecting to a not existing server (thanks to @SGStino).      
+* [RcpClient] Adjusted some namespaces (BREAKING CHANGE!).
+* [AspNetCore] Adjusted some namespaces (BREAKING CHANGE!).
+* [Server] Adjusted some namespaces (BREAKING CHANGE!).
+* [Server] Added state checks (throw if not started etc.) for most server APIs.
+* [Server] Exposed real X509Certificate2 (instead byte array) to TLS options (thanks to @borigas).
+* [Server] Fixed memory leak with TCP sockets (MqttServer is now Disposable!) (BREAKING CHANGE!).
+* [Core] Fixed a null reference exception in the MqttTcpChannel with WriteAsync and ReadAsync.
+* [Core] Added server interceptor for undelivered messages (thanks to @cshark-inator).
+* [nuget] Added support for SourceLink (thanks to @JTOne123).
    </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</tags> 
+    <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" />
@@ -55,6 +55,14 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MQTTnet.Extensions.WebSocke
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Apps", "Apps", "{A56E3128-1639-4F31-873A-325E14BB6295}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Blazor", "Blazor", "{61B165A0-5AA8-4E04-A53D-A22A84AA6EB7}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MQTTnet.Test.BlazorApp.Server", "Tests\MQTTnet.Test.BlazorApp\Server\MQTTnet.Test.BlazorApp.Server.csproj", "{A9662AF3-3520-4BF8-9DFF-C55C0C33D08F}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MQTTnet.Test.BlazorApp.Client", "Tests\MQTTnet.Test.BlazorApp\Client\MQTTnet.Test.BlazorApp.Client.csproj", "{D260D63D-7902-4C55-9665-84C5CACBBB24}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MQTTnet.Test.BlazorApp.Shared", "Tests\MQTTnet.Test.BlazorApp\Shared\MQTTnet.Test.BlazorApp.Shared.csproj", "{DDB069BA-6E1A-48C7-B374-5D903B553CAD}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -266,6 +274,54 @@ Global
 		{2BD01D53-4CA5-4142-BE8D-313876395E3E}.Release|x64.Build.0 = Release|Any CPU
 		{2BD01D53-4CA5-4142-BE8D-313876395E3E}.Release|x86.ActiveCfg = Release|Any CPU
 		{2BD01D53-4CA5-4142-BE8D-313876395E3E}.Release|x86.Build.0 = Release|Any CPU
+		{A9662AF3-3520-4BF8-9DFF-C55C0C33D08F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A9662AF3-3520-4BF8-9DFF-C55C0C33D08F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A9662AF3-3520-4BF8-9DFF-C55C0C33D08F}.Debug|ARM.ActiveCfg = Debug|Any CPU
+		{A9662AF3-3520-4BF8-9DFF-C55C0C33D08F}.Debug|ARM.Build.0 = Debug|Any CPU
+		{A9662AF3-3520-4BF8-9DFF-C55C0C33D08F}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{A9662AF3-3520-4BF8-9DFF-C55C0C33D08F}.Debug|x64.Build.0 = Debug|Any CPU
+		{A9662AF3-3520-4BF8-9DFF-C55C0C33D08F}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{A9662AF3-3520-4BF8-9DFF-C55C0C33D08F}.Debug|x86.Build.0 = Debug|Any CPU
+		{A9662AF3-3520-4BF8-9DFF-C55C0C33D08F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A9662AF3-3520-4BF8-9DFF-C55C0C33D08F}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A9662AF3-3520-4BF8-9DFF-C55C0C33D08F}.Release|ARM.ActiveCfg = Release|Any CPU
+		{A9662AF3-3520-4BF8-9DFF-C55C0C33D08F}.Release|ARM.Build.0 = Release|Any CPU
+		{A9662AF3-3520-4BF8-9DFF-C55C0C33D08F}.Release|x64.ActiveCfg = Release|Any CPU
+		{A9662AF3-3520-4BF8-9DFF-C55C0C33D08F}.Release|x64.Build.0 = Release|Any CPU
+		{A9662AF3-3520-4BF8-9DFF-C55C0C33D08F}.Release|x86.ActiveCfg = Release|Any CPU
+		{A9662AF3-3520-4BF8-9DFF-C55C0C33D08F}.Release|x86.Build.0 = Release|Any CPU
+		{D260D63D-7902-4C55-9665-84C5CACBBB24}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D260D63D-7902-4C55-9665-84C5CACBBB24}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D260D63D-7902-4C55-9665-84C5CACBBB24}.Debug|ARM.ActiveCfg = Debug|Any CPU
+		{D260D63D-7902-4C55-9665-84C5CACBBB24}.Debug|ARM.Build.0 = Debug|Any CPU
+		{D260D63D-7902-4C55-9665-84C5CACBBB24}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{D260D63D-7902-4C55-9665-84C5CACBBB24}.Debug|x64.Build.0 = Debug|Any CPU
+		{D260D63D-7902-4C55-9665-84C5CACBBB24}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{D260D63D-7902-4C55-9665-84C5CACBBB24}.Debug|x86.Build.0 = Debug|Any CPU
+		{D260D63D-7902-4C55-9665-84C5CACBBB24}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D260D63D-7902-4C55-9665-84C5CACBBB24}.Release|Any CPU.Build.0 = Release|Any CPU
+		{D260D63D-7902-4C55-9665-84C5CACBBB24}.Release|ARM.ActiveCfg = Release|Any CPU
+		{D260D63D-7902-4C55-9665-84C5CACBBB24}.Release|ARM.Build.0 = Release|Any CPU
+		{D260D63D-7902-4C55-9665-84C5CACBBB24}.Release|x64.ActiveCfg = Release|Any CPU
+		{D260D63D-7902-4C55-9665-84C5CACBBB24}.Release|x64.Build.0 = Release|Any CPU
+		{D260D63D-7902-4C55-9665-84C5CACBBB24}.Release|x86.ActiveCfg = Release|Any CPU
+		{D260D63D-7902-4C55-9665-84C5CACBBB24}.Release|x86.Build.0 = Release|Any CPU
+		{DDB069BA-6E1A-48C7-B374-5D903B553CAD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{DDB069BA-6E1A-48C7-B374-5D903B553CAD}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{DDB069BA-6E1A-48C7-B374-5D903B553CAD}.Debug|ARM.ActiveCfg = Debug|Any CPU
+		{DDB069BA-6E1A-48C7-B374-5D903B553CAD}.Debug|ARM.Build.0 = Debug|Any CPU
+		{DDB069BA-6E1A-48C7-B374-5D903B553CAD}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{DDB069BA-6E1A-48C7-B374-5D903B553CAD}.Debug|x64.Build.0 = Debug|Any CPU
+		{DDB069BA-6E1A-48C7-B374-5D903B553CAD}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{DDB069BA-6E1A-48C7-B374-5D903B553CAD}.Debug|x86.Build.0 = Debug|Any CPU
+		{DDB069BA-6E1A-48C7-B374-5D903B553CAD}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{DDB069BA-6E1A-48C7-B374-5D903B553CAD}.Release|Any CPU.Build.0 = Release|Any CPU
+		{DDB069BA-6E1A-48C7-B374-5D903B553CAD}.Release|ARM.ActiveCfg = Release|Any CPU
+		{DDB069BA-6E1A-48C7-B374-5D903B553CAD}.Release|ARM.Build.0 = Release|Any CPU
+		{DDB069BA-6E1A-48C7-B374-5D903B553CAD}.Release|x64.ActiveCfg = Release|Any CPU
+		{DDB069BA-6E1A-48C7-B374-5D903B553CAD}.Release|x64.Build.0 = Release|Any CPU
+		{DDB069BA-6E1A-48C7-B374-5D903B553CAD}.Release|x86.ActiveCfg = Release|Any CPU
+		{DDB069BA-6E1A-48C7-B374-5D903B553CAD}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -283,6 +339,10 @@ Global
 		{61B62223-F5D0-48E4-BBD6-2CBA9353CB5E} = {9248C2E1-B9D6-40BF-81EC-86004D7765B4}
 		{5699FB8C-838C-4AB0-80A5-9CA809F9B65B} = {A56E3128-1639-4F31-873A-325E14BB6295}
 		{2BD01D53-4CA5-4142-BE8D-313876395E3E} = {12816BCC-AF9E-44A9-9AE5-C246AF2A0587}
+		{61B165A0-5AA8-4E04-A53D-A22A84AA6EB7} = {9248C2E1-B9D6-40BF-81EC-86004D7765B4}
+		{A9662AF3-3520-4BF8-9DFF-C55C0C33D08F} = {61B165A0-5AA8-4E04-A53D-A22A84AA6EB7}
+		{D260D63D-7902-4C55-9665-84C5CACBBB24} = {61B165A0-5AA8-4E04-A53D-A22A84AA6EB7}
+		{DDB069BA-6E1A-48C7-B374-5D903B553CAD} = {61B165A0-5AA8-4E04-A53D-A22A84AA6EB7}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {07536672-5CBC-4BE3-ACE0-708A431A7894}
@@ -72,6 +72,7 @@ _MQTTnet Server_ is a standalone cross platform MQTT server (like mosquitto) bas
 * 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

@@ -3,7 +3,7 @@ using Microsoft.AspNetCore.Builder;
 using Microsoft.Extensions.DependencyInjection;
 using MQTTnet.Server;

-namespace MQTTnet.AspNetCore
+namespace MQTTnet.AspNetCore.Extensions
 {
    public static class ApplicationBuilderExtensions
    {
@@ -1,6 +1,6 @@
 using Microsoft.AspNetCore.Connections;

-namespace MQTTnet.AspNetCore
+namespace MQTTnet.AspNetCore.Extensions
 {
    public static class ConnectionBuilderExtensions
    {
@@ -1,8 +1,11 @@
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Http.Connections;
-using System;

-namespace MQTTnet.AspNetCore
+#if NETCOREAPP3_1
+using System;
+#endif
+
+namespace MQTTnet.AspNetCore.Extensions
 {
    public static class ConnectionRouteBuilderExtensions
    {
@@ -5,7 +5,7 @@ using MQTTnet.Exceptions;
 using MQTTnet.Formatter;
 using MQTTnet.Packets;

-namespace MQTTnet.AspNetCore
+namespace MQTTnet.AspNetCore.Extensions
 {
    public static class ReaderExtensions
    {
@@ -1,12 +1,12 @@
-using Microsoft.Extensions.DependencyInjection;
+using System;
+using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 using MQTTnet.Adapter;
 using MQTTnet.Diagnostics;
 using MQTTnet.Implementations;
 using MQTTnet.Server;
-using System;

-namespace MQTTnet.AspNetCore
+namespace MQTTnet.AspNetCore.Extensions
 {
    public static class ServiceCollectionExtensions
    {
@@ -8,8 +8,15 @@
    <PackageId />
    <LangVersion>7.2</LangVersion>
    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <IncludeSymbols>true</IncludeSymbols>
+    <SymbolPackageFormat>snupkg</SymbolPackageFormat>
  </PropertyGroup>

+  <ItemGroup>
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
+  </ItemGroup>
+
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
    <DefineConstants>RELEASE;NETSTANDARD2_0</DefineConstants>
  </PropertyGroup>
@@ -19,7 +26,7 @@
  </ItemGroup>
    
  <ItemGroup Condition="'$(TargetFramework)' != 'netcoreapp3.1'">
-    <PackageReference Include="Microsoft.AspNetCore.Http.Connections" Version="1.0.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Http.Connections" Version="1.1.0" />
  </ItemGroup>

  <ItemGroup>
@@ -10,11 +10,19 @@ 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
 {
-    public class MqttConnectionContext : IMqttChannelAdapter
+    public sealed class MqttConnectionContext : IMqttChannelAdapter
    {
+        readonly AsyncLock _writerLock = new AsyncLock();
+        readonly SpanBasedMqttPacketBodyReader _reader;
+        
+        PipeReader _input;
+        PipeWriter _output;
+        
        public MqttConnectionContext(MqttPacketFormatterAdapter packetFormatterAdapter, ConnectionContext connection)
        {
            PacketFormatterAdapter = packetFormatterAdapter ?? throw new ArgumentNullException(nameof(packetFormatterAdapter));
@@ -29,10 +37,6 @@ namespace MQTTnet.AspNetCore
            _reader = new SpanBasedMqttPacketBodyReader();
        }

-        private PipeReader _input;
-        private PipeWriter _output;
-        private readonly SpanBasedMqttPacketBodyReader _reader;
-
        public string Endpoint
        {
            get
@@ -57,9 +61,8 @@ namespace MQTTnet.AspNetCore

        public X509Certificate2 ClientCertificate => Http?.HttpContext?.Connection?.ClientCertificate;

-        private IHttpContextFeature Http => Connection.Features.Get<IHttpContextFeature>();
-
        public ConnectionContext Connection { get; }
+        
        public MqttPacketFormatterAdapter PacketFormatterAdapter { get; }

        public long BytesSent { get; set; }
@@ -68,7 +71,7 @@ namespace MQTTnet.AspNetCore
        public Action ReadingPacketStartedCallback { get; set; }
        public Action ReadingPacketCompletedCallback { get; set; }

-        private readonly SemaphoreSlim _writerSemaphore = new SemaphoreSlim(1, 1);
+        IHttpContextFeature Http => Connection.Features.Get<IHttpContextFeature>();

        public async Task ConnectAsync(TimeSpan timeout, CancellationToken cancellationToken)
        {
@@ -142,6 +145,13 @@ namespace MQTTnet.AspNetCore
                    }
                }
            }
+            catch (Exception e)
+            {
+                // completing the cannels makes sure that there is no more data read after a protocol error
+                _input?.Complete(e);
+                _output?.Complete(e);
+                throw;
+            }
            finally
            {
                ReadingPacketCompletedCallback?.Invoke();
@@ -160,25 +170,18 @@ namespace MQTTnet.AspNetCore
        public async Task SendPacketAsync(MqttBasePacket packet, TimeSpan timeout, CancellationToken cancellationToken)
        {
            var formatter = PacketFormatterAdapter;
-            var buffer = formatter.Encode(packet);
-            var msg = buffer.AsMemory();
-            var output = _output;
-
-            await _writerSemaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
-            try
+            using (await _writerLock.WaitAsync(cancellationToken).ConfigureAwait(false))
            {
+                var buffer = formatter.Encode(packet);
+                var msg = buffer.AsMemory();
+                var output = _output;
                var result = await output.WriteAsync(msg, cancellationToken).ConfigureAwait(false);
                if (result.IsCompleted)
                {
                    BytesSent += msg.Length;
                }
-
                PacketFormatterAdapter.FreeBuffer();
            }
-            finally
-            {
-                _writerSemaphore.Release();
-            }
        }

        public void Dispose()
@@ -1,12 +1,29 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Linq;
+using Microsoft.AspNetCore.Http;

 namespace MQTTnet.AspNetCore
 {
    public static class MqttSubProtocolSelector
    {
+        public static string SelectSubProtocol(HttpRequest request)
+        {
+            if (request == null) throw new ArgumentNullException(nameof(request));
+
+            string subProtocol = null;
+            if (request.Headers.TryGetValue("Sec-WebSocket-Protocol", out var requestedSubProtocolValues))
+            {
+                subProtocol = SelectSubProtocol(requestedSubProtocolValues);
+            }
+
+            return subProtocol;
+        }
+        
        public static string SelectSubProtocol(IList<string> requestedSubProtocolValues)
        {
+            if (requestedSubProtocolValues == null) throw new ArgumentNullException(nameof(requestedSubProtocolValues));
+
            // Order the protocols to also match "mqtt", "mqttv-3.1", "mqttv-3.11" etc.
            return requestedSubProtocolValues
                .OrderByDescending(p => p.Length)
@@ -8,9 +8,9 @@ namespace MQTTnet.AspNetCore
 {
    public class SpanBasedMqttPacketBodyReader : IMqttPacketBodyReader
    {
-        private ReadOnlyMemory<byte> _buffer;
+        ReadOnlyMemory<byte> _buffer;

-        private int _offset;
+        int _offset;
        
        public void SetBuffer(ReadOnlyMemory<byte> buffer)
        {
@@ -38,16 +38,6 @@ namespace MQTTnet.AspNetCore
        {
            return ReadSegmentWithLengthPrefix().ToArray();
        }
-
-        private ReadOnlySpan<byte> ReadSegmentWithLengthPrefix()
-        {
-            var span = _buffer.Span;
-            var length = BinaryPrimitives.ReadUInt16BigEndian(span.Slice(_offset));
-
-            var result = span.Slice(_offset+2, length);
-            _offset += 2 + length;
-            return result;
-        }
        
        public unsafe string ReadStringWithLengthPrefix()
        {
@@ -121,5 +111,19 @@ namespace MQTTnet.AspNetCore
        {
            _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;
+        }
    }
 }
@@ -8,16 +8,15 @@ namespace MQTTnet.AspNetCore
 {
    public class SpanBasedMqttPacketWriter : IMqttPacketWriter
    {
-        private readonly ArrayPool<byte> _pool;
+        readonly ArrayPool<byte> _pool = ArrayPool<byte>.Create();

        public SpanBasedMqttPacketWriter()
        {
-            _pool = ArrayPool<byte>.Create();
-            
+            Reset(0);
        }

-        private byte[] _buffer;
-        private int _position;
+        byte[] _buffer;
+        int _position;

        public int Length { get; set; }

@@ -112,7 +111,7 @@ namespace MQTTnet.AspNetCore
            Commit(payload.Length);
        }

-        private void Commit(int count)
+        void Commit(int count)
        {
            if (_position == Length)
            {
@@ -122,7 +121,7 @@ namespace MQTTnet.AspNetCore
            _position += count;
        }

-        private void GrowIfNeeded(int requiredAdditional) 
+        void GrowIfNeeded(int requiredAdditional) 
        {
            var requiredTotal = _position + requiredAdditional;
            if (_buffer.Length >= requiredTotal)
@@ -8,6 +8,9 @@
    <Company />
    <Authors />
    <PackageId />
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <IncludeSymbols>true</IncludeSymbols>
+    <SymbolPackageFormat>snupkg</SymbolPackageFormat>
  </PropertyGroup>

  <PropertyGroup Condition="'$(TargetFramework)' == 'uap10.0'">
@@ -23,6 +26,10 @@
    <LanguageTargets>$(MSBuildExtensionsPath)\Microsoft\WindowsXaml\v$(VisualStudioVersion)\Microsoft.Windows.UI.Xaml.CSharp.targets</LanguageTargets>
  </PropertyGroup>

+  <ItemGroup>
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
+  </ItemGroup>
+
  <ItemGroup>
    <ProjectReference Include="..\MQTTnet\MQTTnet.csproj" />
  </ItemGroup>
@@ -76,36 +76,39 @@ namespace MQTTnet.Extensions.ManagedClient
            return client;
        }

-        public static IManagedMqttClient UseApplicationMessageReceivedHandler(this IManagedMqttClient client, Func<MqttApplicationMessageReceivedEventArgs, Task> handler)
+        public static TReceiver UseApplicationMessageReceivedHandler<TReceiver>(this TReceiver receiver, Func<MqttApplicationMessageReceivedEventArgs, Task> handler)
+            where TReceiver : IApplicationMessageReceiver
        {
-            if (client == null) throw new ArgumentNullException(nameof(client));
+            if (receiver == null) throw new ArgumentNullException(nameof(receiver));

            if (handler == null)
            {
-                return client.UseApplicationMessageReceivedHandler((IMqttApplicationMessageReceivedHandler)null);
+                return receiver.UseApplicationMessageReceivedHandler((IMqttApplicationMessageReceivedHandler)null);
            }

-            return client.UseApplicationMessageReceivedHandler(new MqttApplicationMessageReceivedHandlerDelegate(handler));
+            return receiver.UseApplicationMessageReceivedHandler(new MqttApplicationMessageReceivedHandlerDelegate(handler));
        }

-        public static IManagedMqttClient UseApplicationMessageReceivedHandler(this IManagedMqttClient client, Action<MqttApplicationMessageReceivedEventArgs> handler)
+        public static TReceiver UseApplicationMessageReceivedHandler<TReceiver>(this TReceiver receiver, Action<MqttApplicationMessageReceivedEventArgs> handler)
+            where TReceiver : IApplicationMessageReceiver
        {
-            if (client == null) throw new ArgumentNullException(nameof(client));
+            if (receiver == null) throw new ArgumentNullException(nameof(receiver));

            if (handler == null)
            {
-                return client.UseApplicationMessageReceivedHandler((IMqttApplicationMessageReceivedHandler)null);
+                return receiver.UseApplicationMessageReceivedHandler((IMqttApplicationMessageReceivedHandler)null);
            }

-            return client.UseApplicationMessageReceivedHandler(new MqttApplicationMessageReceivedHandlerDelegate(handler));
+            return receiver.UseApplicationMessageReceivedHandler(new MqttApplicationMessageReceivedHandlerDelegate(handler));
        }

-        public static IManagedMqttClient UseApplicationMessageReceivedHandler(this IManagedMqttClient client, IMqttApplicationMessageReceivedHandler handler)
+        public static TReceiver UseApplicationMessageReceivedHandler<TReceiver>(this TReceiver receiver, IMqttApplicationMessageReceivedHandler handler)
+            where TReceiver : IApplicationMessageReceiver
        {
-            if (client == null) throw new ArgumentNullException(nameof(client));
+            if (receiver == null) throw new ArgumentNullException(nameof(receiver));

-            client.ApplicationMessageReceivedHandler = handler;
-            return client;
+            receiver.ApplicationMessageReceivedHandler = handler;
+            return receiver;
        }

        public static Task SubscribeAsync(this IManagedMqttClient client, params MqttTopicFilter[] topicFilters)
@@ -138,92 +141,92 @@ namespace MQTTnet.Extensions.ManagedClient
            return client.UnsubscribeAsync(topicFilters);
        }

-        public static async Task PublishAsync(this IManagedMqttClient client, IEnumerable<MqttApplicationMessage> applicationMessages)
+        public static async Task PublishAsync(this IApplicationMessagePublisher publisher, IEnumerable<MqttApplicationMessage> applicationMessages)
        {
-            if (client == null) throw new ArgumentNullException(nameof(client));
+            if (publisher == null) throw new ArgumentNullException(nameof(publisher));
            if (applicationMessages == null) throw new ArgumentNullException(nameof(applicationMessages));

            foreach (var applicationMessage in applicationMessages)
            {
-                await client.PublishAsync(applicationMessage).ConfigureAwait(false);
+                await publisher.PublishAsync(applicationMessage).ConfigureAwait(false);
            }
        }

-        public static Task<MqttClientPublishResult> PublishAsync(this IManagedMqttClient client, MqttApplicationMessage applicationMessage)
+        public static Task<MqttClientPublishResult> PublishAsync(this IApplicationMessagePublisher publisher, MqttApplicationMessage applicationMessage)
        {
-            if (client == null) throw new ArgumentNullException(nameof(client));
+            if (publisher == null) throw new ArgumentNullException(nameof(publisher));
            if (applicationMessage == null) throw new ArgumentNullException(nameof(applicationMessage));

-            return client.PublishAsync(applicationMessage, CancellationToken.None);
+            return publisher.PublishAsync(applicationMessage, CancellationToken.None);
        }

-        public static async Task PublishAsync(this IManagedMqttClient client, params MqttApplicationMessage[] applicationMessages)
+        public static async Task PublishAsync(this IApplicationMessagePublisher publisher, params MqttApplicationMessage[] applicationMessages)
        {
-            if (client == null) throw new ArgumentNullException(nameof(client));
+            if (publisher == null) throw new ArgumentNullException(nameof(publisher));
            if (applicationMessages == null) throw new ArgumentNullException(nameof(applicationMessages));

            foreach (var applicationMessage in applicationMessages)
            {
-                await client.PublishAsync(applicationMessage, CancellationToken.None).ConfigureAwait(false);
+                await publisher.PublishAsync(applicationMessage, CancellationToken.None).ConfigureAwait(false);
            }
        }

-        public static Task<MqttClientPublishResult> PublishAsync(this IManagedMqttClient client, string topic)
+        public static Task<MqttClientPublishResult> PublishAsync(this IApplicationMessagePublisher publisher, string topic)
        {
-            if (client == null) throw new ArgumentNullException(nameof(client));
+            if (publisher == null) throw new ArgumentNullException(nameof(publisher));
            if (topic == null) throw new ArgumentNullException(nameof(topic));

-            return client.PublishAsync(builder => builder
+            return publisher.PublishAsync(builder => builder
                .WithTopic(topic));
        }

-        public static Task<MqttClientPublishResult> PublishAsync(this IManagedMqttClient client, string topic, string payload)
+        public static Task<MqttClientPublishResult> PublishAsync(this IApplicationMessagePublisher publisher, string topic, string payload)
        {
-            if (client == null) throw new ArgumentNullException(nameof(client));
+            if (publisher == null) throw new ArgumentNullException(nameof(publisher));
            if (topic == null) throw new ArgumentNullException(nameof(topic));

-            return client.PublishAsync(builder => builder
+            return publisher.PublishAsync(builder => builder
                .WithTopic(topic)
                .WithPayload(payload));
        }

-        public static Task<MqttClientPublishResult> PublishAsync(this IManagedMqttClient client, string topic, string payload, MqttQualityOfServiceLevel qualityOfServiceLevel)
+        public static Task<MqttClientPublishResult> PublishAsync(this IApplicationMessagePublisher publisher, string topic, string payload, MqttQualityOfServiceLevel qualityOfServiceLevel)
        {
-            if (client == null) throw new ArgumentNullException(nameof(client));
+            if (publisher == null) throw new ArgumentNullException(nameof(publisher));
            if (topic == null) throw new ArgumentNullException(nameof(topic));

-            return client.PublishAsync(builder => builder
+            return publisher.PublishAsync(builder => builder
                .WithTopic(topic)
                .WithPayload(payload)
                .WithQualityOfServiceLevel(qualityOfServiceLevel));
        }

-        public static Task<MqttClientPublishResult> PublishAsync(this IManagedMqttClient client, string topic, string payload, MqttQualityOfServiceLevel qualityOfServiceLevel, bool retain)
+        public static Task<MqttClientPublishResult> PublishAsync(this IApplicationMessagePublisher publisher, string topic, string payload, MqttQualityOfServiceLevel qualityOfServiceLevel, bool retain)
        {
-            if (client == null) throw new ArgumentNullException(nameof(client));
+            if (publisher == null) throw new ArgumentNullException(nameof(publisher));
            if (topic == null) throw new ArgumentNullException(nameof(topic));

-            return client.PublishAsync(builder => builder
+            return publisher.PublishAsync(builder => builder
                .WithTopic(topic)
                .WithPayload(payload)
                .WithQualityOfServiceLevel(qualityOfServiceLevel)
                .WithRetainFlag(retain));
        }

-        public static Task<MqttClientPublishResult> PublishAsync(this IManagedMqttClient client, Func<MqttApplicationMessageBuilder, MqttApplicationMessageBuilder> builder, CancellationToken cancellationToken)
+        public static Task<MqttClientPublishResult> PublishAsync(this IApplicationMessagePublisher publisher, Func<MqttApplicationMessageBuilder, MqttApplicationMessageBuilder> builder, CancellationToken cancellationToken)
        {
-            if (client == null) throw new ArgumentNullException(nameof(client));
+            if (publisher == null) throw new ArgumentNullException(nameof(publisher));

            var message = builder(new MqttApplicationMessageBuilder()).Build();
-            return client.PublishAsync(message, cancellationToken);
+            return publisher.PublishAsync(message, cancellationToken);
        }

-        public static Task<MqttClientPublishResult> PublishAsync(this IManagedMqttClient client, Func<MqttApplicationMessageBuilder, MqttApplicationMessageBuilder> builder)
+        public static Task<MqttClientPublishResult> PublishAsync(this IApplicationMessagePublisher publisher, Func<MqttApplicationMessageBuilder, MqttApplicationMessageBuilder> builder)
        {
-            if (client == null) throw new ArgumentNullException(nameof(client));
+            if (publisher == null) throw new ArgumentNullException(nameof(publisher));

            var message = builder(new MqttApplicationMessageBuilder()).Build();
-            return client.PublishAsync(message, CancellationToken.None);
+            return publisher.PublishAsync(message, CancellationToken.None);
        }
    }
 }
@@ -8,6 +8,9 @@
    <Company />
    <Authors />
    <PackageId />
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <IncludeSymbols>true</IncludeSymbols>
+    <SymbolPackageFormat>snupkg</SymbolPackageFormat>
  </PropertyGroup>

  <PropertyGroup Condition="'$(TargetFramework)' == 'uap10.0'">
@@ -23,6 +26,10 @@
    <LanguageTargets>$(MSBuildExtensionsPath)\Microsoft\WindowsXaml\v$(VisualStudioVersion)\Microsoft.Windows.UI.Xaml.CSharp.targets</LanguageTargets>
  </PropertyGroup>

+  <ItemGroup>
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
+  </ItemGroup>
+
  <ItemGroup>
    <ProjectReference Include="..\MQTTnet\MQTTnet.csproj" />
  </ItemGroup>
@@ -1,7 +1,6 @@
-using MQTTnet.Extensions.Rpc.Options.TopicGeneration;
-using System;
+using System;

-namespace MQTTnet.Extensions.Rpc.Options
+namespace MQTTnet.Extensions.Rpc.Options.TopicGeneration
 {
    public class DefaultMqttRpcClientTopicGenerationStrategy : IMqttRpcClientTopicGenerationStrategy
    {
@@ -8,6 +8,9 @@
    <Company />
    <Authors />
    <PackageId />
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <IncludeSymbols>true</IncludeSymbols>
+    <SymbolPackageFormat>snupkg</SymbolPackageFormat>
  </PropertyGroup>

  <PropertyGroup Condition="'$(TargetFramework)' == 'uap10.0'">
@@ -23,6 +26,10 @@
    <LanguageTargets>$(MSBuildExtensionsPath)\Microsoft\WindowsXaml\v$(VisualStudioVersion)\Microsoft.Windows.UI.Xaml.CSharp.targets</LanguageTargets>
  </PropertyGroup>

+  <ItemGroup>
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
+  </ItemGroup>
+
  <ItemGroup>
    <PackageReference Include="WebSocket4Net" Version="0.15.2" />
  </ItemGroup>
@@ -0,0 +1,12 @@
+{
+  "version": 1,
+  "isRoot": true,
+  "tools": {
+    "dotnet-ef": {
+      "version": "3.1.4",
+      "commands": [
+        "dotnet-ef"
+      ]
+    }
+  }
+}
@@ -8,19 +8,22 @@
    <GeneratePackageOnBuild>False</GeneratePackageOnBuild>
    <Company />
    <Product>MQTTnet</Product>
-    <Description />
-    <Authors />
+    <Description>Standalone MQTT server with Python scripting backend.</Description>
+    <Authors>The authors of MQTTnet.Server.</Authors>
    <PackageId />
    <SignAssembly>false</SignAssembly>
    <DelaySign>false</DelaySign>
    <LangVersion>latest</LangVersion>
-    <Version>1.0.0</Version>
+    <Version>3.0.11</Version>
    <TypeScriptToolsVersion>3.3</TypeScriptToolsVersion>
  </PropertyGroup>

  <PropertyGroup>
    <StartupObject>MQTTnet.Server.Program</StartupObject>
    <UserSecretsId>c564f0de-28b4-45bf-b726-4d665d705653</UserSecretsId>
+    <Copyright>(c) Christian Kratky 2016-2020</Copyright>
+    <PackageProjectUrl>https://github.com/chkr1011/MQTTnet</PackageProjectUrl>
+    <RepositoryUrl>https://github.com/chkr1011/MQTTnet</RepositoryUrl>
  </PropertyGroup>

  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
@@ -29,13 +32,6 @@
    <NoWarn>1701;1702</NoWarn>
  </PropertyGroup>

-  <ItemGroup>
-    <Compile Remove="wwwroot\**" />
-    <Content Remove="wwwroot\**" />
-    <EmbeddedResource Remove="wwwroot\**" />
-    <None Remove="wwwroot\**" />
-  </ItemGroup>
-
  <ItemGroup>
    <Content Update="appsettings.json">
      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
@@ -43,12 +39,12 @@
  </ItemGroup>

  <ItemGroup>
-    <PackageReference Include="IronPython" Version="2.7.10-candidate1" />
-    <PackageReference Include="IronPython.StdLib" Version="2.7.10-candidate1" />
-    <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="3.1.3" />
-    <PackageReference Include="MSTest.TestAdapter" Version="2.1.1" />
-    <PackageReference Include="Swashbuckle.AspNetCore.SwaggerGen" Version="5.3.3" />
-    <PackageReference Include="Swashbuckle.AspNetCore.SwaggerUI" Version="5.3.3" />
+    <PackageReference Include="IronPython" Version="2.7.10" />
+    <PackageReference Include="IronPython.StdLib" Version="2.7.10" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="3.1.5" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.1.2" />
+    <PackageReference Include="Swashbuckle.AspNetCore.SwaggerGen" Version="5.5.1" />
+    <PackageReference Include="Swashbuckle.AspNetCore.SwaggerUI" Version="5.5.1" />
  </ItemGroup>

  <ItemGroup>
@@ -72,11 +68,19 @@
    <None Update="Web\authorization_handler.py">
      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
    </None>
+    <None Update="Web\wwwroot\Hello.txt">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Update="Web\wwwroot\mqtt_Test.html">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Update="Web\wwwroot\pahoJS_Test.html">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
  </ItemGroup>

  <ItemGroup>
    <Folder Include="Properties\PublishProfiles\" />
-    <Folder Include="Web\wwwroot\" />
  </ItemGroup>

 </Project>
@@ -3,6 +3,7 @@ using Microsoft.Extensions.Hosting;
 using MQTTnet.Server.Web;
 using System;
 using System.Diagnostics;
+using System.IO;
 using System.Reflection;

 namespace MQTTnet.Server
@@ -21,8 +22,8 @@ namespace MQTTnet.Server
                        webBuilder.ConfigureKestrel(serverOptions =>
                        {
                        })
+                        .UseWebRoot(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Web", "wwwroot"))
                        .UseStartup<Startup>();
-
                    }).Build().Run();

                return 0;
@@ -6,6 +6,7 @@ using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Net.Http.Headers;
 using Microsoft.OpenApi.Models;
 using Microsoft.Scripting.Utils;
+using MQTTnet.AspNetCore;
 using MQTTnet.Server.Configuration;
 using MQTTnet.Server.Logging;
 using MQTTnet.Server.Mqtt;
@@ -40,6 +41,9 @@ namespace MQTTnet.Server.Web
            DataSharingService dataSharingService,
            MqttSettingsModel mqttSettings)
        {
+            application.UseDefaultFiles();
+            application.UseStaticFiles();
+
            application.UseHsts();
            application.UseRouting();
            application.UseCors(x => x
@@ -49,9 +53,7 @@ namespace MQTTnet.Server.Web

            application.UseAuthentication();
            application.UseAuthorization();
-
-            application.UseStaticFiles();
-
+     
            application.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
@@ -81,7 +83,6 @@ namespace MQTTnet.Server.Web
        {
            services.AddCors();

-
            services.AddControllers();

            services.AddMvc()
@@ -197,7 +198,13 @@ namespace MQTTnet.Server.Web
                {
                    if (context.WebSockets.IsWebSocketRequest)
                    {
-                        using (var webSocket = await context.WebSockets.AcceptWebSocketAsync().ConfigureAwait(false))
+                        string subProtocol = null;
+                        if (context.Request.Headers.TryGetValue("Sec-WebSocket-Protocol", out var requestedSubProtocolValues))
+                        {
+                            subProtocol = MqttSubProtocolSelector.SelectSubProtocol(requestedSubProtocolValues);
+                        }
+
+                        using (var webSocket = await context.WebSockets.AcceptWebSocketAsync(subProtocol).ConfigureAwait(false))
                        {
                            await mqttServerService.RunWebSocketConnectionAsync(webSocket, context).ConfigureAwait(false);
                        }
@@ -0,0 +1 @@
+World
@@ -0,0 +1,33 @@
+<html>
+
+<head>
+    <title>MQTT JS Example</title>
+
+    <script src="https://cdn.jsdelivr.net/npm/mqtt@4.0.1/dist/mqtt.min.js" type="text/javascript"></script>
+
+    <script type="text/javascript">
+        var client = mqtt.connect('ws://localhost:80/mqtt')
+
+        client.on('connect', function () {
+            client.subscribe('mqtt_subscription', function (err) {
+                console.log("Subscribed");
+            })
+        })
+
+        client.on('message', function (topic, message) {
+            console.log(topic);
+            console.log(message.toString())
+        })
+
+        function buttonClick() {
+            client.publish("MQTT_JS_TOPIC", "payload");
+        }
+    </script>
+
+</head>
+
+<body>
+    <button onclick="buttonClick()">Publish</button>
+</body>
+
+</html>
@@ -0,0 +1,41 @@
+<html>
+
+<head>
+    <title>paho JS Example</title>
+
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/paho-mqtt/1.0.1/mqttws31.js" type="text/javascript"></script>
+
+    <script type="text/javascript">
+        var mqttClient = new Paho.MQTT.Client("localhost", 80, "/mqtt", "pahoJS_client");
+        mqttClient.onConnectionLost = onConnectionLost;
+        mqttClient.onMessageArrived = onMessageArrived;
+        mqttClient.connect({ onSuccess: onConnect });
+
+        function onConnect() {
+            console.log("MQTT client connected");
+            mqttClient.subscribe("pahoJS_subscription");
+        }
+
+        function onConnectionLost(responseObject) {
+            if (responseObject.errorCode !== 0) {
+                console.log("onConnectionLost:" + responseObject.errorMessage);
+            }
+        }
+
+        function onMessageArrived(message) {
+            console.log("onMessageArrived:" + message.payloadString);
+        }
+        function buttonClick() {
+            message = new Paho.MQTT.Message("Hello");
+            message.destinationName = "pahoJS_topic";
+            mqttClient.send(message);
+        }
+    </script>
+
+</head>
+
+<body>
+    <button onclick="buttonClick()">Publish</button>
+</body>
+
+</html>
@@ -16,8 +16,8 @@ namespace MQTTnet.Adapter
 {
    public sealed class MqttChannelAdapter : Disposable, IMqttChannelAdapter
    {
-        const uint _errorOperationAborted = 0x800703E3;
-        const int _readBufferSize = 4096;  // TODO: Move buffer size to config
+        const uint ErrorOperationAborted = 0x800703E3;
+        const int ReadBufferSize = 4096;

        readonly IMqttNetScopedLogger _logger;
        readonly IMqttChannel _channel;
@@ -25,7 +25,7 @@ namespace MQTTnet.Adapter

        readonly byte[] _fixedHeaderBuffer = new byte[2];

-        SemaphoreSlim _writerSemaphore = new SemaphoreSlim(1, 1);
+        readonly AsyncLock _syncRoot = new AsyncLock();

        long _bytesReceived;
        long _bytesSent;
@@ -58,6 +58,7 @@ namespace MQTTnet.Adapter

        public async Task ConnectAsync(TimeSpan timeout, CancellationToken cancellationToken)
        {
+            cancellationToken.ThrowIfCancellationRequested();
            ThrowIfDisposed();

            try
@@ -84,6 +85,7 @@ namespace MQTTnet.Adapter

        public async Task DisconnectAsync(TimeSpan timeout, CancellationToken cancellationToken)
        {
+            cancellationToken.ThrowIfCancellationRequested();
            ThrowIfDisposed();

            try
@@ -111,43 +113,58 @@ namespace MQTTnet.Adapter

        public async Task SendPacketAsync(MqttBasePacket packet, TimeSpan timeout, CancellationToken cancellationToken)
        {
-            await _writerSemaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
+            cancellationToken.ThrowIfCancellationRequested();
+            ThrowIfDisposed();
+
            try
            {
-                var packetData = PacketFormatterAdapter.Encode(packet);
-
-                if (timeout == TimeSpan.Zero)
+                using (await _syncRoot.WaitAsync(cancellationToken).ConfigureAwait(false))
                {
-                    await _channel.WriteAsync(packetData.Array, packetData.Offset, packetData.Count, cancellationToken).ConfigureAwait(false);
-                }
-                else
-                {
-                    await MqttTaskTimeout.WaitAsync(
-                        t => _channel.WriteAsync(packetData.Array, packetData.Offset, packetData.Count, t), timeout, cancellationToken).ConfigureAwait(false);
-                }
+                    // Check for cancellation here again because "WaitAsync" might take some time.
+                    cancellationToken.ThrowIfCancellationRequested();

-                Interlocked.Add(ref _bytesReceived, packetData.Count);
+                    try
+                    {
+                        var packetData = PacketFormatterAdapter.Encode(packet);

-                _logger.Verbose("TX ({0} bytes) >>> {1}", packetData.Count, packet);
+                        if (timeout == TimeSpan.Zero)
+                        {
+                            await _channel.WriteAsync(packetData.Array, packetData.Offset, packetData.Count, cancellationToken).ConfigureAwait(false);
+                        }
+                        else
+                        {
+                            await MqttTaskTimeout.WaitAsync(
+                                t => _channel.WriteAsync(packetData.Array, packetData.Offset, packetData.Count, t), timeout, cancellationToken).ConfigureAwait(false);
+                        }
+
+                        Interlocked.Add(ref _bytesReceived, packetData.Count);
+
+                        _logger.Verbose("TX ({0} bytes) >>> {1}", packetData.Count, packet);
+                    }
+                    catch (Exception exception)
+                    {
+                        if (IsWrappedException(exception))
+                        {
+                            throw;
+                        }
+
+                        WrapException(exception);
+                    }
+                    finally
+                    {
+                        PacketFormatterAdapter.FreeBuffer();
+                    }
+                }
            }
-            catch (Exception exception)
+            catch (ObjectDisposedException)
            {
-                if (IsWrappedException(exception))
-                {
-                    throw;
-                }
-
-                WrapException(exception);
-            }
-            finally
-            {
-                PacketFormatterAdapter.FreeBuffer();
-                _writerSemaphore?.Release();
+                throw new OperationCanceledException();
            }
        }

        public async Task<MqttBasePacket> ReceivePacketAsync(TimeSpan timeout, CancellationToken cancellationToken)
        {
+            cancellationToken.ThrowIfCancellationRequested();
            ThrowIfDisposed();

            try
@@ -187,6 +204,9 @@ namespace MQTTnet.Adapter
            catch (OperationCanceledException)
            {
            }
+            catch (ObjectDisposedException)
+            {
+            }
            catch (Exception exception)
            {
                if (IsWrappedException(exception))
@@ -210,10 +230,8 @@ namespace MQTTnet.Adapter
        {
            if (disposing)
            {
-                _channel?.Dispose();
-
-                _writerSemaphore?.Dispose();
-                _writerSemaphore = null;
+                _channel.Dispose();
+                _syncRoot.Dispose();
            }

            base.Dispose(disposing);
@@ -245,7 +263,7 @@ namespace MQTTnet.Adapter

                var body = new byte[fixedHeader.RemainingLength];
                var bodyOffset = 0;
-                var chunkSize = Math.Min(_readBufferSize, fixedHeader.RemainingLength);
+                var chunkSize = Math.Min(ReadBufferSize, fixedHeader.RemainingLength);

                do
                {
@@ -304,7 +322,7 @@ namespace MQTTnet.Adapter

            if (exception is COMException comException)
            {
-                if ((uint)comException.HResult == _errorOperationAborted)
+                if ((uint)comException.HResult == ErrorOperationAborted)
                {
                    throw new OperationCanceledException();
                }
@@ -0,0 +1,28 @@
+using System;
+using System.Security.Cryptography.X509Certificates;
+
+namespace MQTTnet.Certificates
+{
+    public class BlobCertificateProvider : ICertificateProvider
+    {
+        public BlobCertificateProvider(byte[] blob)
+        {
+            Blob = blob ?? throw new ArgumentNullException(nameof(blob));
+        }
+
+        public byte[] Blob { get; }
+
+        public string Password { get; set; }
+
+        public X509Certificate2 GetCertificate()
+        {
+            if (string.IsNullOrEmpty(Password))
+            {
+                // Use a different overload when no password is specified. Otherwise the constructor will fail.
+                return new X509Certificate2(Blob);
+            }
+
+            return new X509Certificate2(Blob, Password);
+        }
+    }
+}
@@ -0,0 +1,9 @@
+using System.Security.Cryptography.X509Certificates;
+
+namespace MQTTnet.Certificates
+{
+    public interface ICertificateProvider
+    {
+        X509Certificate2 GetCertificate();
+    }
+}
@@ -0,0 +1,22 @@
+#if !WINDOWS_UWP
+using System;
+using System.Security.Cryptography.X509Certificates;
+
+namespace MQTTnet.Certificates
+{
+    public class X509CertificateProvider : ICertificateProvider
+    {
+        readonly X509Certificate2 _certificate;
+
+        public X509CertificateProvider(X509Certificate2 certificate)
+        {
+            _certificate = certificate ?? throw new ArgumentNullException(nameof(certificate));
+        }
+
+        public X509Certificate2 GetCertificate()
+        {
+            return _certificate;
+        }
+    }
+}
+#endif
@@ -3,6 +3,34 @@
    public enum MqttClientDisconnectReason
    {
        NormalDisconnection = 0,
-
+        DisconnectWithWillMessage = 4,
+        UnspecifiedError = 128,
+        MalformedPacket = 129,
+        ProtocolError = 130,
+        ImplementationSpecificError = 131,
+        NotAuthorized = 135,
+        ServerBusy = 137,
+        ServerShuttingDown = 139,
+        BadAuthenticationMethod = 140,
+        KeepaliveTimeout = 141,
+        SessionTakenOver = 142,
+        TopicFilterInvalid = 143,
+        TopicNameInvalid = 144,
+        ReceiveMaximumExceeded = 147,
+        TopicAliasInvalid = 148,
+        PacketTooLarge = 149,
+        MessageRateTooHigh = 150,
+        QuotaExceeded = 151,
+        AdministrativeAction = 152,
+        PayloadFormatInvalid = 153,
+        RetainNotSupported = 154,
+        QosNotSupported = 155,
+        UseAnotherServer = 156,
+        ServerMoved = 157,
+        SharedSubscriptionsNotSupported = 158,
+        ConnectionRateExceeded = 159,
+        MaximumConnectTime = 160,
+        SubscriptionIdentifiersNotSupported = 161,
+        WildcardSubscriptionsNotSupported = 162
    }
 }
@@ -5,11 +5,12 @@ namespace MQTTnet.Client.Disconnecting
 {
    public class MqttClientDisconnectedEventArgs : EventArgs
    {
-        public MqttClientDisconnectedEventArgs(bool clientWasConnected, Exception exception, MqttClientAuthenticateResult authenticateResult)
+        public MqttClientDisconnectedEventArgs(bool clientWasConnected, Exception exception, MqttClientAuthenticateResult authenticateResult, MqttClientDisconnectReason reasonCode)
        {
            ClientWasConnected = clientWasConnected;
            Exception = exception;
            AuthenticateResult = authenticateResult;
+            ReasonCode = reasonCode;
        }

        public bool ClientWasConnected { get; }
@@ -17,5 +18,7 @@ namespace MQTTnet.Client.Disconnecting
        public Exception Exception { get; }

        public MqttClientAuthenticateResult AuthenticateResult { get; }
+
+        public MqttClientDisconnectReason ReasonCode { get; set; } = MqttClientDisconnectReason.NormalDisconnection;
    }
 }
@@ -1,5 +1,7 @@
-using MQTTnet.Adapter;
+using System;
+using MQTTnet.Adapter;
 using MQTTnet.Diagnostics;
+using MQTTnet.LowLevelClient;

 namespace MQTTnet.Client
 {
@@ -7,6 +9,14 @@ namespace MQTTnet.Client
    {
        IMqttFactory UseClientAdapterFactory(IMqttClientAdapterFactory clientAdapterFactory);

+        ILowLevelMqttClient CreateLowLevelMqttClient();
+
+        ILowLevelMqttClient CreateLowLevelMqttClient(IMqttNetLogger logger);
+
+        ILowLevelMqttClient CreateLowLevelMqttClient(IMqttClientAdapterFactory clientAdapterFactory);
+
+        ILowLevelMqttClient CreateLowLevelMqttClient(IMqttNetLogger logger, IMqttClientAdapterFactory clientAdapterFactory);
+
        IMqttClient CreateMqttClient();

        IMqttClient CreateMqttClient(IMqttNetLogger logger);
@@ -57,13 +57,7 @@ namespace MQTTnet.Client

        public IMqttApplicationMessageReceivedHandler ApplicationMessageReceivedHandler { get; set; }

-        public bool IsConnected
-        {
-            get
-            {
-                return _isConnected && Interlocked.Read(ref _isDisconnectPending) == 0;
-            }
-        }
+        public bool IsConnected => _isConnected && Interlocked.Read(ref _isDisconnectPending) == 0;

        public IMqttClientOptions Options { get; private set; }

@@ -164,9 +158,9 @@ namespace MQTTnet.Client
            }
        }

-        public async Task PingAsync(CancellationToken cancellationToken)
+        public Task PingAsync(CancellationToken cancellationToken)
        {
-            await SendAndReceiveAsync<MqttPingRespPacket>(new MqttPingReqPacket(), cancellationToken).ConfigureAwait(false);
+            return SendAndReceiveAsync<MqttPingRespPacket>(new MqttPingReqPacket(), cancellationToken);
        }

        public Task SendExtendedAuthenticationExchangeDataAsync(MqttExtendedAuthenticationExchangeData data, CancellationToken cancellationToken)
@@ -309,6 +303,7 @@ namespace MQTTnet.Client
        async Task DisconnectInternalAsync(Task sender, Exception exception, MqttClientAuthenticateResult authenticateResult)
        {
            var clientWasConnected = IsConnected;
+            var reasonCode = MqttClientDisconnectReason.NormalDisconnection;

            TryInitiateDisconnect();
            _isConnected = false;
@@ -326,6 +321,7 @@ namespace MQTTnet.Client
            catch (Exception adapterException)
            {
                _logger.Warning(adapterException, "Error while disconnecting from adapter.");
+                reasonCode = MqttClientDisconnectReason.UnspecifiedError;
            }

            try
@@ -341,6 +337,7 @@ namespace MQTTnet.Client
            catch (Exception e)
            {
                _logger.Warning(e, "Error while waiting for internal tasks.");
+                reasonCode = MqttClientDisconnectReason.UnspecifiedError;
            }
            finally
            {
@@ -354,7 +351,7 @@ namespace MQTTnet.Client
                {
                    // This handler must be executed in a new thread because otherwise a dead lock may happen
                    // when trying to reconnect in that handler etc.
-                    Task.Run(() => disconnectedHandler.HandleDisconnectedAsync(new MqttClientDisconnectedEventArgs(clientWasConnected, exception, authenticateResult))).Forget(_logger);
+                    Task.Run(() => disconnectedHandler.HandleDisconnectedAsync(new MqttClientDisconnectedEventArgs(clientWasConnected, exception, authenticateResult, reasonCode))).Forget(_logger);
                }
            }
        }
@@ -446,7 +443,11 @@ namespace MQTTnet.Client
                        await SendAndReceiveAsync<MqttPingRespPacket>(new MqttPingReqPacket(), cancellationToken).ConfigureAwait(false);
                    }

-                    await Task.Delay(keepAlivePeriod, cancellationToken).ConfigureAwait(false);
+                    // Wait a fixed time in all cases. Calculation of the remaining time is complicated
+                    // due to some edge cases and was buggy in the past. Now we wait half a second because the
+                    // min keep alive value is one second so that the server will wait 1.5 seconds for a PING
+                    // packet.
+                    await Task.Delay(TimeSpan.FromMilliseconds(100), cancellationToken).ConfigureAwait(false);
                }
            }
            catch (Exception exception)
@@ -134,7 +134,7 @@ namespace MQTTnet.Formatter
        {
            if (_length < _offset + length)
            {
-                throw new ArgumentOutOfRangeException(nameof(_buffer), $"Expected at least {_offset + length} bytes but there are only {_length} bytes");
+                throw new MqttProtocolViolationException($"Expected at least {_offset + length} bytes but there are only {_length} bytes");
            }
        }

@@ -120,6 +120,14 @@ namespace MQTTnet.Formatter
        {
            if (receivedMqttPacket == null) throw new ArgumentNullException(nameof(receivedMqttPacket));

+            if (receivedMqttPacket.Body.Length < 7)
+            {
+                // 2 byte protocol name length
+                // at least 4 byte protocol name
+                // 1 byte protocol level
+                throw new MqttProtocolViolationException("CONNECT packet must have at least 7 bytes.");
+            }
+
            var protocolName = receivedMqttPacket.Body.ReadStringWithLengthPrefix();
            var protocolLevel = receivedMqttPacket.Body.ReadByte();

@@ -1,4 +1,5 @@
-using MQTTnet.Client;
+using System.Collections.Generic;
+using MQTTnet.Client;
 using MQTTnet.Diagnostics;
 using MQTTnet.Server;

@@ -7,5 +8,7 @@ namespace MQTTnet
    public interface IMqttFactory : IMqttClientFactory, IMqttServerFactory
    {
        IMqttNetLogger DefaultLogger { get; }
+
+        IDictionary<object, object> Properties { get; }
    }
 }
@@ -20,7 +20,7 @@ namespace MQTTnet.Implementations

        public CrossPlatformSocket()
        {
-            // Having this contructor is important because avoiding the address family as parameter
+            // Having this constructor is important because avoiding the address family as parameter
            // will make use of dual mode in the .net framework.
            _socket = new Socket(SocketType.Stream, ProtocolType.Tcp);
        }
@@ -33,75 +33,34 @@ namespace MQTTnet.Implementations

        public bool NoDelay
        {
-            get
-            {
-                return (int)_socket.GetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.NoDelay) > 0;
-            }
-
-            set
-            {
-                _socket.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.NoDelay, value ? 1 : 0);
-            }
+            get => (int)_socket.GetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.NoDelay) > 0;
+            set => _socket.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.NoDelay, value ? 1 : 0);
        }

        public bool DualMode
        {
-            get
-            {
-                return _socket.DualMode;
-            }
-
-            set
-            {
-                _socket.DualMode = value;
-            }
+            get => _socket.DualMode;
+            set => _socket.DualMode = value;
        }

        public int ReceiveBufferSize
        {
-            get
-            {
-                return _socket.ReceiveBufferSize;
-            }
-
-            set
-            {
-                _socket.ReceiveBufferSize = value;
-            }
+            get => _socket.ReceiveBufferSize;
+            set => _socket.ReceiveBufferSize = value;
        }

        public int SendBufferSize
        {
-            get
-            {
-                return _socket.SendBufferSize;
-            }
-
-            set
-            {
-                _socket.SendBufferSize = value;
-            }
+            get => _socket.SendBufferSize;
+            set => _socket.SendBufferSize = value;
        }

-        public EndPoint RemoteEndPoint
-        {
-            get
-            {
-                return _socket.RemoteEndPoint;
-            }
-        }
+        public EndPoint RemoteEndPoint => _socket.RemoteEndPoint;

        public bool ReuseAddress
        {
-            get
-            {
-                return (int)_socket.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress) != 0;
-            }
-
-            set
-            {
-                _socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, value ? 1 : 0);
-            }
+            get => (int)_socket.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress) != 0;
+            set => _socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, value ? 1 : 0);
        }

        public async Task<CrossPlatformSocket> AcceptAsync()
@@ -17,14 +17,14 @@ using MQTTnet.Server;

 namespace MQTTnet.Implementations
 {
-    public class MqttTcpChannel : IMqttChannel
+    public sealed class MqttTcpChannel : IMqttChannel
    {
-        private readonly MqttClientTcpOptions _options;
-        private readonly int _bufferSize;
+        readonly MqttClientTcpOptions _options;
+        readonly int _bufferSize;

-        private StreamSocket _socket;
-        private Stream _readStream;
-        private Stream _writeStream;
+        StreamSocket _socket;
+        Stream _readStream;
+        Stream _writeStream;

        public MqttTcpChannel(IMqttClientOptions clientOptions)
        {
@@ -13,7 +13,7 @@ using System.Threading.Tasks;

 namespace MQTTnet.Implementations
 {
-    public sealed class MqttTcpChannel : IDisposable, IMqttChannel
+    public sealed class MqttTcpChannel : IMqttChannel
    {
        readonly IMqttClientOptions _clientOptions;
        readonly MqttClientTcpOptions _options;
@@ -127,7 +127,14 @@ namespace MQTTnet.Implementations
                // Workaround for: https://github.com/dotnet/corefx/issues/24430
                using (cancellationToken.Register(Dispose))
                {
-                    return await _stream.ReadAsync(buffer, offset, count, cancellationToken).ConfigureAwait(false);
+                    var stream = _stream;
+
+                    if (stream == null)
+                    {
+                        throw new ObjectDisposedException(nameof(stream));
+                    }
+
+                    return await stream.ReadAsync(buffer, offset, count, cancellationToken).ConfigureAwait(false);
                }
            }
            catch (ObjectDisposedException)
@@ -157,12 +164,18 @@ namespace MQTTnet.Implementations
                // Workaround for: https://github.com/dotnet/corefx/issues/24430
                using (cancellationToken.Register(Dispose))
                {
-                    await _stream.WriteAsync(buffer, offset, count, cancellationToken).ConfigureAwait(false);
+                    var stream = _stream;
+
+                    if (stream == null)
+                    {
+                        throw new ObjectDisposedException(nameof(stream));
+                    }
+
+                    await stream.WriteAsync(buffer, offset, count, cancellationToken).ConfigureAwait(false);
                }
            }
            catch (ObjectDisposedException)
            {
-                return;
            }
            catch (IOException exception)
            {
@@ -205,7 +218,6 @@ namespace MQTTnet.Implementations
            {
                return certificateValidationCallback(x509Certificate, chain, sslPolicyErrors, _clientOptions);
            }
-
 #endregion

            var certificateValidationHandler = _options?.TlsOptions?.CertificateValidationHandler;
@@ -229,7 +241,7 @@ namespace MQTTnet.Implementations

            if (chain.ChainStatus.Any(c => c.Status == X509ChainStatusFlags.RevocationStatusUnknown || c.Status == X509ChainStatusFlags.Revoked || c.Status == X509ChainStatusFlags.OfflineRevocation))
            {
-                if (!_options.TlsOptions.IgnoreCertificateRevocationErrors)
+                if (_options?.TlsOptions?.IgnoreCertificateRevocationErrors != true)
                {
                    return false;
                }
@@ -237,13 +249,13 @@ namespace MQTTnet.Implementations

            if (chain.ChainStatus.Any(c => c.Status == X509ChainStatusFlags.PartialChain))
            {
-                if (!_options.TlsOptions.IgnoreCertificateChainErrors)
+                if (_options?.TlsOptions?.IgnoreCertificateChainErrors != true)
                {
                    return false;
                }
            }

-            return _options.TlsOptions.AllowUntrustedCertificates;
+            return _options?.TlsOptions?.AllowUntrustedCertificates == true;
        }

        X509CertificateCollection LoadCertificates()
@@ -1,7 +1,6 @@
 #if !WINDOWS_UWP
 using MQTTnet.Adapter;
 using MQTTnet.Diagnostics;
-using MQTTnet.Internal;
 using MQTTnet.Server;
 using System;
 using System.Collections.Generic;
@@ -13,7 +12,7 @@ using System.Threading.Tasks;

 namespace MQTTnet.Implementations
 {
-    public sealed class MqttTcpServerAdapter : Disposable, IMqttServerAdapter
+    public sealed class MqttTcpServerAdapter : IMqttServerAdapter
    {
        readonly List<MqttTcpServerListener> _listeners = new List<MqttTcpServerListener>();
        readonly IMqttNetScopedLogger _logger;
@@ -44,22 +43,12 @@ namespace MQTTnet.Implementations

            if (options.TlsEndpointOptions?.IsEnabled == true)
            {
-                if (options.TlsEndpointOptions.Certificate == null)
+                if (options.TlsEndpointOptions.CertificateProvider == null)
                {
                    throw new ArgumentException("TLS certificate is not set.");
                }
-
-                X509Certificate2 tlsCertificate;
-                if (string.IsNullOrEmpty(options.TlsEndpointOptions.CertificateCredentials?.Password))
-                {
-                    // Use a different overload when no password is specified. Otherwise the constructor will fail.
-                    tlsCertificate = new X509Certificate2(options.TlsEndpointOptions.Certificate);
-                }
-                else
-                {
-                    tlsCertificate = new X509Certificate2(options.TlsEndpointOptions.Certificate, options.TlsEndpointOptions.CertificateCredentials.Password);
-                }
-
+                
+                var tlsCertificate = options.TlsEndpointOptions.CertificateProvider.GetCertificate();
                if (!tlsCertificate.HasPrivateKey)
                {
                    throw new InvalidOperationException("The certificate for TLS encryption must contain the private key.");
@@ -68,23 +57,18 @@ namespace MQTTnet.Implementations
                RegisterListeners(options.TlsEndpointOptions, tlsCertificate, _cancellationTokenSource.Token);
            }

-            return Task.FromResult(0);
+            return PlatformAbstractionLayer.CompletedTask;
        }

        public Task StopAsync()
        {
            Cleanup();
-            return Task.FromResult(0);
+            return PlatformAbstractionLayer.CompletedTask;
        }

-        protected override void Dispose(bool disposing)
+        public void Dispose()
        {
-            if (disposing)
-            {
-                Cleanup();
-            }
-
-            base.Dispose(disposing);
+            Cleanup();
        }

        void Cleanup()
@@ -130,7 +114,7 @@ namespace MQTTnet.Implementations
            }
        }

-        private Task OnClientAcceptedAsync(IMqttChannelAdapter channelAdapter)
+        Task OnClientAcceptedAsync(IMqttChannelAdapter channelAdapter)
        {
            var clientHandler = ClientHandler;
            if (clientHandler == null)
@@ -24,8 +24,8 @@ namespace MQTTnet.Implementations
        readonly MqttServerTlsTcpEndpointOptions _tlsOptions;
        readonly X509Certificate2 _tlsCertificate;

-        private CrossPlatformSocket _socket;
-        private IPEndPoint _localEndPoint;
+        CrossPlatformSocket _socket;
+        IPEndPoint _localEndPoint;

        public MqttTcpServerListener(
            AddressFamily addressFamily,
@@ -35,7 +35,7 @@ namespace MQTTnet.Implementations

        public bool IsSecureConnection { get; private set; }

-        public X509Certificate2 ClientCertificate { get; private set; }
+        public X509Certificate2 ClientCertificate { get; }

        public async Task ConnectAsync(CancellationToken cancellationToken)
        {
@@ -5,10 +5,10 @@ using System.Threading.Tasks;
 namespace MQTTnet.Internal
 {
    // From Stephen Toub (https://blogs.msdn.microsoft.com/pfxteam/2012/02/12/building-async-coordination-primitives-part-6-asynclock/)
-    public class AsyncLock : IDisposable
+    public sealed class AsyncLock : IDisposable
    {
-        private readonly SemaphoreSlim _semaphore = new SemaphoreSlim(1, 1);
-        private readonly Task<IDisposable> _releaser;
+        readonly SemaphoreSlim _semaphore = new SemaphoreSlim(1, 1);
+        readonly Task<IDisposable> _releaser;

        public AsyncLock()
        {
@@ -39,9 +39,9 @@ namespace MQTTnet.Internal
            _semaphore?.Dispose();
        }

-        private class Releaser : IDisposable
+        class Releaser : IDisposable
        {
-            private readonly AsyncLock _toRelease;
+            readonly AsyncLock _toRelease;

            internal Releaser(AsyncLock toRelease)
            {
@@ -48,7 +48,7 @@ namespace MQTTnet.LowLevelClient
            }
            catch (Exception)
            {
-                _adapter.Dispose();
+                _adapter?.Dispose();
                throw;
            }

@@ -14,6 +14,9 @@
    <PackageId />
    <SignAssembly>false</SignAssembly>
    <DelaySign>false</DelaySign>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <IncludeSymbols>true</IncludeSymbols>
+    <SymbolPackageFormat>snupkg</SymbolPackageFormat>
  </PropertyGroup>

  <PropertyGroup Condition="'$(TargetFramework)'=='uap10.0'">
@@ -41,6 +44,10 @@
    <DefineConstants>RELEASE;NETSTANDARD1_3</DefineConstants>
  </PropertyGroup>

+  <ItemGroup>
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
+  </ItemGroup>
+
  <ItemGroup Condition="'$(TargetFramework)'=='netstandard1.3'">
    <PackageReference Include="System.Net.Security" Version="4.3.2" />
    <PackageReference Include="System.Net.WebSockets" Version="4.3.0" />
@@ -6,6 +6,7 @@ using MQTTnet.LowLevelClient;
 using MQTTnet.Server;
 using System;
 using System.Collections.Generic;
+using System.Linq;

 namespace MQTTnet
 {
@@ -25,6 +26,13 @@ namespace MQTTnet

        public IMqttNetLogger DefaultLogger { get; }

+        public IList<Func<IMqttFactory, IMqttServerAdapter>> DefaultServerAdapters { get; } = new List<Func<IMqttFactory, IMqttServerAdapter>>
+        {
+            factory => new MqttTcpServerAdapter(factory.DefaultLogger)
+        };
+
+        public IDictionary<object, object> Properties { get; } = new Dictionary<object, object>();
+
        public IMqttFactory UseClientAdapterFactory(IMqttClientAdapterFactory clientAdapterFactory)
        {
            _clientAdapterFactory = clientAdapterFactory ?? throw new ArgumentNullException(nameof(clientAdapterFactory));
@@ -50,10 +58,10 @@ namespace MQTTnet
            return new LowLevelMqttClient(_clientAdapterFactory, DefaultLogger);
        }

-        public ILowLevelMqttClient CreateLowLevelMqttClient(IMqttNetLogger logger, IMqttClientAdapterFactory clientAdapterFactoryy)
+        public ILowLevelMqttClient CreateLowLevelMqttClient(IMqttNetLogger logger, IMqttClientAdapterFactory clientAdapterFactory)
        {
            if (logger == null) throw new ArgumentNullException(nameof(logger));
-            if (clientAdapterFactoryy == null) throw new ArgumentNullException(nameof(clientAdapterFactoryy));
+            if (clientAdapterFactory == null) throw new ArgumentNullException(nameof(clientAdapterFactory));

            return new LowLevelMqttClient(_clientAdapterFactory, logger);
        }
@@ -94,7 +102,8 @@ namespace MQTTnet
        {
            if (logger == null) throw new ArgumentNullException(nameof(logger));

-            return CreateMqttServer(new List<IMqttServerAdapter> { new MqttTcpServerAdapter(logger) }, logger);
+            var serverAdapters = DefaultServerAdapters.Select(a => a.Invoke(this));
+            return CreateMqttServer(serverAdapters, logger);
        }

        public IMqttServer CreateMqttServer(IEnumerable<IMqttServerAdapter> serverAdapters, IMqttNetLogger logger)
@@ -4,7 +4,7 @@ using System;

 namespace MQTTnet
 {
-    [Obsolete("Use MqttTopicFilter instead. It is just a renamed version to align with general namings in this lib.")]
+    [Obsolete("Use MqttTopicFilterBuilder instead. It is just a renamed version to align with general namings in this lib.")]
    public class TopicFilterBuilder : MqttTopicFilterBuilder
    {
    }
@@ -1,10 +1,11 @@
-using MQTTnet.Server.Status;
+using System;
+using MQTTnet.Server.Status;
 using System.Collections.Generic;
 using System.Threading.Tasks;

 namespace MQTTnet.Server
 {
-    public interface IMqttServer : IApplicationMessageReceiver, IApplicationMessagePublisher
+    public interface IMqttServer : IApplicationMessageReceiver, IApplicationMessagePublisher, IDisposable
    {
        bool IsStarted { get; }
        IMqttServerStartedHandler StartedHandler { get; set; }
@@ -1,4 +1,7 @@
-public interface IMqttServerCertificateCredentials
+namespace MQTTnet.Server
 {
-    string Password { get; }
+    public interface IMqttServerCertificateCredentials
+    {
+        string Password { get; }
+    }
 }
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using MQTTnet.Adapter;
 using MQTTnet.Diagnostics;

@@ -6,6 +7,8 @@ namespace MQTTnet.Server
 {
    public interface IMqttServerFactory
    {
+        IList<Func<IMqttFactory, IMqttServerAdapter>> DefaultServerAdapters { get; }
+
        IMqttServer CreateMqttServer();

        IMqttServer CreateMqttServer(IMqttNetLogger logger);
@@ -25,5 +25,7 @@ namespace MQTTnet.Server
        IMqttServerStorage Storage { get; }

        IMqttRetainedMessagesManager RetainedMessagesManager { get; }
+
+        IMqttServerApplicationMessageInterceptor UndeliveredMessageInterceptor { get; set; }
    }
 }
@@ -46,17 +46,19 @@ namespace MQTTnet.Server
        /// </summary>
        public IDictionary<object, object> Items { get; }

-        public void EnqueueApplicationMessage(MqttApplicationMessage applicationMessage, string senderClientId, bool isRetainedApplicationMessage)
+        public bool EnqueueApplicationMessage(MqttApplicationMessage applicationMessage, string senderClientId, bool isRetainedApplicationMessage)
        {
            var checkSubscriptionsResult = SubscriptionsManager.CheckSubscriptions(applicationMessage.Topic, applicationMessage.QualityOfServiceLevel);
            if (!checkSubscriptionsResult.IsSubscribed)
            {
-                return;
+                return false;
            }

            _logger.Verbose("Queued application message with topic '{0}' (ClientId: {1}).", applicationMessage.Topic, ClientId);

            ApplicationMessagesQueue.Enqueue(applicationMessage, senderClientId, checkSubscriptionsResult.QualityOfServiceLevel, isRetainedApplicationMessage);
+
+            return true;
        }

        public async Task SubscribeAsync(ICollection<MqttTopicFilter> topicFilters)
@@ -14,7 +14,7 @@ using System.Threading.Tasks;

 namespace MQTTnet.Server
 {
-    public class MqttClientSessionsManager : Disposable
+    public sealed class MqttClientSessionsManager : IDisposable
    {
        readonly AsyncQueue<MqttEnqueuedApplicationMessage> _messageQueue = new AsyncQueue<MqttEnqueuedApplicationMessage>();

@@ -150,13 +150,9 @@ namespace MQTTnet.Server
            _logger.Verbose("Session for client '{0}' deleted.", clientId);
        }

-        protected override void Dispose(bool disposing)
+        public void Dispose()
        {
-            if (disposing)
-            {
-                _messageQueue?.Dispose();
-            }
-            base.Dispose(disposing);
+            _messageQueue?.Dispose();
        }

        async Task TryProcessQueuedApplicationMessagesAsync(CancellationToken cancellationToken)
@@ -224,12 +220,31 @@ namespace MQTTnet.Server
                    await _retainedMessagesManager.HandleMessageAsync(sender?.ClientId, applicationMessage).ConfigureAwait(false);
                }

+                var deliveryCount = 0;
+
                foreach (var clientSession in _sessions.Values)
                {
-                    clientSession.EnqueueApplicationMessage(
+                    var isSubscribed = clientSession.EnqueueApplicationMessage(
                        applicationMessage,
                        sender?.ClientId,
                        false);
+
+                    if (isSubscribed)
+                    {
+                        deliveryCount++;
+                    }
+                }
+
+                if (deliveryCount == 0)
+                {
+                    var undeliveredMessageInterceptor = _options.UndeliveredMessageInterceptor;
+
+                    if (undeliveredMessageInterceptor == null)
+                    {
+                        return;
+                    }
+
+                    await undeliveredMessageInterceptor.InterceptApplicationMessagePublishAsync(new MqttApplicationMessageInterceptorContext(sender?.ClientId, sender?.Session?.Items, applicationMessage));
                }
            }
            catch (OperationCanceledException)
@@ -245,9 +260,9 @@ namespace MQTTnet.Server
        {
            string clientId = null;

-            MqttConnectPacket connectPacket;
            try
            {
+                MqttConnectPacket connectPacket;
                try
                {
                    var firstPacket = await channelAdapter.ReceivePacketAsync(_options.DefaultCommunicationTimeout, cancellationToken).ConfigureAwait(false);
@@ -10,10 +10,12 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
+using MQTTnet.Implementations;
+using MQTTnet.Internal;

 namespace MQTTnet.Server
 {
-    public class MqttServer : IMqttServer
+    public class MqttServer : Disposable, IMqttServer
    {
        readonly MqttServerEventDispatcher _eventDispatcher;
        readonly ICollection<IMqttServerAdapter> _adapters;
@@ -76,23 +78,43 @@ namespace MQTTnet.Server

        public Task<IList<IMqttClientStatus>> GetClientStatusAsync()
        {
+            ThrowIfDisposed();
+            ThrowIfNotStarted();
+
            return _clientSessionsManager.GetClientStatusAsync();
        }

        public Task<IList<IMqttSessionStatus>> GetSessionStatusAsync()
        {
+            ThrowIfDisposed();
+            ThrowIfNotStarted();
+
            return _clientSessionsManager.GetSessionStatusAsync();
        }

        public Task<IList<MqttApplicationMessage>> GetRetainedApplicationMessagesAsync()
        {
+            ThrowIfDisposed();
+            ThrowIfNotStarted();
+
            return _retainedMessagesManager.GetMessagesAsync();
        }

+        public Task ClearRetainedApplicationMessagesAsync()
+        {
+            ThrowIfDisposed();
+            ThrowIfNotStarted();
+
+            return _retainedMessagesManager?.ClearMessagesAsync() ?? PlatformAbstractionLayer.CompletedTask;
+        }
+
        public Task SubscribeAsync(string clientId, ICollection<MqttTopicFilter> topicFilters)
        {
            if (clientId == null) throw new ArgumentNullException(nameof(clientId));
            if (topicFilters == null) throw new ArgumentNullException(nameof(topicFilters));
+            
+            ThrowIfDisposed();
+            ThrowIfNotStarted();

            return _clientSessionsManager.SubscribeAsync(clientId, topicFilters);
        }
@@ -102,6 +124,9 @@ namespace MQTTnet.Server
            if (clientId == null) throw new ArgumentNullException(nameof(clientId));
            if (topicFilters == null) throw new ArgumentNullException(nameof(topicFilters));

+            ThrowIfDisposed();
+            ThrowIfNotStarted();
+
            return _clientSessionsManager.UnsubscribeAsync(clientId, topicFilters);
        }

@@ -109,9 +134,11 @@ namespace MQTTnet.Server
        {
            if (applicationMessage == null) throw new ArgumentNullException(nameof(applicationMessage));

+            ThrowIfDisposed();
+
            MqttTopicValidator.ThrowIfInvalid(applicationMessage.Topic);

-            if (_cancellationTokenSource == null) throw new InvalidOperationException("The server is not started.");
+            ThrowIfNotStarted();

            _clientSessionsManager.DispatchApplicationMessage(applicationMessage, null);

@@ -120,16 +147,16 @@ namespace MQTTnet.Server

        public async Task StartAsync(IMqttServerOptions options)
        {
+            ThrowIfDisposed();
+            ThrowIfStarted();
+
            Options = options ?? throw new ArgumentNullException(nameof(options));
-
-            if (Options.RetainedMessagesManager == null) throw new MqttConfigurationException("options.RetainedMessagesManager should not be null.");
-
-            if (_cancellationTokenSource != null) throw new InvalidOperationException("The server is already started.");
-
+            
            _cancellationTokenSource = new CancellationTokenSource();

-            _retainedMessagesManager = Options.RetainedMessagesManager;
-            await _retainedMessagesManager.Start(Options, _rootLogger);
+            _retainedMessagesManager = Options.RetainedMessagesManager ?? throw new MqttConfigurationException("options.RetainedMessagesManager should not be null.");
+
+            await _retainedMessagesManager.Start(Options, _rootLogger).ConfigureAwait(false);
            await _retainedMessagesManager.LoadMessagesAsync().ConfigureAwait(false);

            _clientSessionsManager = new MqttClientSessionsManager(Options, _retainedMessagesManager, _cancellationTokenSource.Token, _eventDispatcher, _rootLogger);
@@ -173,13 +200,13 @@ namespace MQTTnet.Server
            }
            finally
            {
+                _clientSessionsManager?.Dispose();
+                _clientSessionsManager = null;
+
                _cancellationTokenSource?.Dispose();
                _cancellationTokenSource = null;

                _retainedMessagesManager = null;
-
-                _clientSessionsManager?.Dispose();
-                _clientSessionsManager = null;
            }

            var stoppedHandler = StoppedHandler;
@@ -189,14 +216,40 @@ namespace MQTTnet.Server
            }
        }

-        public Task ClearRetainedApplicationMessagesAsync()
+        protected override void Dispose(bool disposing)
        {
-            return _retainedMessagesManager?.ClearMessagesAsync();
+            if (disposing)
+            {
+                StopAsync().GetAwaiter().GetResult();
+
+                foreach (var adapter in _adapters)
+                {
+                    adapter.Dispose();
+                }
+            }
+
+            base.Dispose(disposing);
        }

        Task OnHandleClient(IMqttChannelAdapter channelAdapter)
        {
            return _clientSessionsManager.HandleClientConnectionAsync(channelAdapter);
        }
+
+        void ThrowIfStarted()
+        {
+            if (_cancellationTokenSource != null)
+            {
+                throw new InvalidOperationException("The MQTT server is already started.");
+            }
+        }
+
+        void ThrowIfNotStarted()
+        {
+            if (_cancellationTokenSource == null)
+            {
+                throw new InvalidOperationException("The MQTT server is not started.");
+            }
+        }
    }
 }
@@ -31,5 +31,7 @@ namespace MQTTnet.Server
        public IMqttServerStorage Storage { get; set; }

        public IMqttRetainedMessagesManager RetainedMessagesManager { get; set; } = new MqttRetainedMessagesManager();
+
+        public IMqttServerApplicationMessageInterceptor UndeliveredMessageInterceptor { get; set; }
    }
 }
@@ -2,13 +2,18 @@
 using System.Net;
 using System.Net.Security;
 using System.Security.Authentication;
+using MQTTnet.Certificates;
+
+#if !WINDOWS_UWP
+using System.Security.Cryptography.X509Certificates;
+#endif

 namespace MQTTnet.Server
 {
    public class MqttServerOptionsBuilder
    {
-        private readonly MqttServerOptions _options = new MqttServerOptions();
-
+        readonly MqttServerOptions _options = new MqttServerOptions();
+        
        public MqttServerOptionsBuilder WithConnectionBacklog(int value)
        {
            _options.DefaultEndpointOptions.ConnectionBacklog = value;
@@ -82,13 +87,28 @@ namespace MQTTnet.Server
            return this;
        }

+#if !WINDOWS_UWP
        public MqttServerOptionsBuilder WithEncryptionCertificate(byte[] value, IMqttServerCertificateCredentials credentials = null)
        {
-            _options.TlsEndpointOptions.Certificate = value;
-            _options.TlsEndpointOptions.CertificateCredentials = credentials;
+            if (value == null) throw new ArgumentNullException(nameof(value));
+
+            _options.TlsEndpointOptions.CertificateProvider = new BlobCertificateProvider(value)
+            {
+                Password = credentials?.Password
+            };
+
            return this;
        }

+        public MqttServerOptionsBuilder WithEncryptionCertificate(X509Certificate2 certificate)
+        {
+            if (certificate == null) throw new ArgumentNullException(nameof(certificate));
+
+            _options.TlsEndpointOptions.CertificateProvider = new X509CertificateProvider(certificate);
+            return this;
+        }
+#endif
+
        public MqttServerOptionsBuilder WithEncryptionSslProtocol(SslProtocols value)
        {
            _options.TlsEndpointOptions.SslProtocol = value;
@@ -173,6 +193,18 @@ namespace MQTTnet.Server
            return this;
        }

+        public MqttServerOptionsBuilder WithDefaultEndpointReuseAddress()
+        {
+            _options.DefaultEndpointOptions.ReuseAddress = true;
+            return this;
+        }
+
+        public MqttServerOptionsBuilder WithTlsEndpointReuseAddress()
+        {
+            _options.TlsEndpointOptions.ReuseAddress = true;
+            return this;
+        }
+
        public MqttServerOptionsBuilder WithPersistentSessions()
        {
            _options.EnablePersistentSessions = true;
@@ -192,5 +224,11 @@ namespace MQTTnet.Server
        {
            return _options;
        }
+
+        public MqttServerOptionsBuilder WithUndeliveredMessageInterceptor(Action<MqttApplicationMessageInterceptorContext> value)
+        {
+            _options.UndeliveredMessageInterceptor = new MqttServerApplicationMessageInterceptorDelegate(value);
+            return this;
+        }
    }
 }
@@ -1,26 +1,56 @@
-using System.Net.Security;
+using System;
 using System.Security.Authentication;
+using MQTTnet.Certificates;

 namespace MQTTnet.Server
 {
    public class MqttServerTlsTcpEndpointOptions : MqttServerTcpEndpointBaseOptions
    {
+        ICertificateProvider _certificateProvider;
+
        public MqttServerTlsTcpEndpointOptions()
        {
            Port = 8883;
        }

+        [Obsolete("Please use CertificateProvider with 'BlobCertificateProvider' instead.")]
        public byte[] Certificate { get; set; }

+        [Obsolete("Please use CertificateProvider with 'BlobCertificateProvider' including password property instead.")]
        public IMqttServerCertificateCredentials CertificateCredentials { get; set; }

+#if !WINDOWS_UWP
+        public System.Net.Security.RemoteCertificateValidationCallback RemoteCertificateValidationCallback { get; set; }
+#endif
+        public ICertificateProvider CertificateProvider
+        {
+            get
+            {
+                // Backward compatibility only. Gets converted to auto property when
+                // obsolete properties are removed.
+                if (_certificateProvider != null)
+                {
+                    return _certificateProvider;
+                }
+
+                if (Certificate == null)
+                {
+                    return null;
+                }
+
+                return new BlobCertificateProvider(Certificate)
+                {
+                    Password = CertificateCredentials?.Password
+                };
+            }
+
+            set => _certificateProvider = value;
+        }
+
        public bool ClientCertificateRequired { get; set; }

        public bool CheckCertificateRevocation { get; set; }

-#if !WINDOWS_UWP
-        public RemoteCertificateValidationCallback RemoteCertificateValidationCallback { get; set; }
-#endif
        public SslProtocols SslProtocol { get; set; } = SslProtocols.Tls12;
    }
 }
@@ -6,13 +6,15 @@
  </PropertyGroup>

  <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.Hosting" Version="2.2.7" />
-    <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="2.2.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.6.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="2.1.1" />
-    <PackageReference Include="MSTest.TestFramework" Version="2.1.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.6.1" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.1.2" />
+    <PackageReference Include="MSTest.TestFramework" Version="2.1.2" />
  </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" />
@@ -15,6 +15,8 @@ using MQTTnet.Exceptions;
 using MQTTnet.Formatter;
 using MQTTnet.Packets;
 using System.Net;
+using MQTTnet.AspNetCore.Extensions;
+using MQTTnet.Protocol;

 namespace MQTTnet.AspNetCore.Tests
 {
@@ -34,28 +36,46 @@ namespace MQTTnet.AspNetCore.Tests

            await Assert.ThrowsExceptionAsync<MqttCommunicationException>(() => ctx.ReceivePacketAsync(TimeSpan.Zero, CancellationToken.None));
        }
-        
+
        [TestMethod]
-        public async Task TestParallelWrites()
+        public async Task TestCorruptedConnectPacket()
        {
-            var serializer = new MqttPacketFormatterAdapter(MqttProtocolVersion.V311);
+            var writer = new MqttPacketWriter();
+            var serializer = new MqttPacketFormatterAdapter(writer);
            var pipe = new DuplexPipeMockup();
            var connection = new DefaultConnectionContext();
            connection.Transport = pipe;
            var ctx = new MqttConnectionContext(serializer, connection);
+            
+            await pipe.Receive.Writer.WriteAsync(writer.AddMqttHeader(MqttControlPacketType.Connect, new byte[0]));

-            var tasks = Enumerable.Range(1, 10).Select(_ => Task.Run(async () => 
-            {
-                for (int i = 0; i < 100; i++)
-                {
-                    await ctx.SendPacketAsync(new MqttPublishPacket(), TimeSpan.Zero, CancellationToken.None).ConfigureAwait(false);
-                }
-            }));
+            await Assert.ThrowsExceptionAsync<MqttProtocolViolationException>(() => ctx.ReceivePacketAsync(TimeSpan.Zero, CancellationToken.None));

-            await Task.WhenAll(tasks).ConfigureAwait(false);
+            // 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));
        }

+        // COMMENTED OUT DUE TO DEAD LOCK? OR VERY VERY SLOW PERFORMANCE ON LOCAL DEV MACHINE. TEST WAS STILL RUNNING AFTER SEVERAL MINUTES!
+        //[TestMethod]
+        //public async Task TestParallelWrites()
+        //{
+        //    var serializer = new MqttPacketFormatterAdapter(MqttProtocolVersion.V311);
+        //    var pipe = new DuplexPipeMockup();
+        //    var connection = new DefaultConnectionContext();
+        //    connection.Transport = pipe;
+        //    var ctx = new MqttConnectionContext(serializer, connection);

+        //    var tasks = Enumerable.Range(1, 100).Select(_ => Task.Run(async () => 
+        //    {
+        //        for (int i = 0; i < 100; i++)
+        //        {
+        //            await ctx.SendPacketAsync(new MqttPublishPacket(), TimeSpan.Zero, CancellationToken.None).ConfigureAwait(false);
+        //        }
+        //    }));
+
+        //    await Task.WhenAll(tasks).ConfigureAwait(false);
+        //}
+        
        [TestMethod]
        public async Task TestLargePacket()
        {
@@ -1,6 +1,7 @@
-#if NETCOREAPP
+#if NETCOREAPP3_1
 using System.Buffers;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
+using MQTTnet.AspNetCore.Extensions;
 using MQTTnet.Formatter;
 using MQTTnet.Packets;

@@ -31,7 +32,6 @@ namespace MQTTnet.AspNetCore.Tests
            result = serializer.TryDecode(reader, 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);
            Assert.IsFalse(result);
@@ -0,0 +1,15 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using MQTTnet.Formatter;
+using MQTTnet.Tests;
+
+namespace MQTTnet.AspNetCore.Tests
+{
+    [TestClass]
+    public class SpanBasedMqttPacketWriterTests : MqttPacketWriter_Tests
+    {
+        protected override IMqttPacketWriter WriterFactory()
+        {
+            return new SpanBasedMqttPacketWriter();
+        }
+    }
+}
@@ -10,7 +10,7 @@

  <ItemGroup>
    <PackageReference Include="BenchmarkDotNet" Version="0.12.1" />
-    <PackageReference Include="System.IO.Pipelines" Version="4.7.1" />
+    <PackageReference Include="System.IO.Pipelines" Version="4.7.2" />
    <PackageReference Include="Microsoft.AspNetCore" Version="2.2.0" />
  </ItemGroup>

@@ -9,6 +9,7 @@ using Microsoft.AspNetCore.Hosting;
 using MQTTnet.Server;
 using MQTTnet.Diagnostics;
 using MQTTnet.AspNetCore.Client;
+using MQTTnet.AspNetCore.Extensions;
 using MQTTnet.Client.Options;

 namespace MQTTnet.Benchmarks
@@ -0,0 +1,15 @@
+using MQTTnet.Protocol;
+
+namespace MQTTnet.Formatter
+{
+    public static class MqttPacketWriterExtensions
+    {
+        public static byte[] AddMqttHeader(this IMqttPacketWriter writer, MqttControlPacketType header, byte[] body)
+        {
+            writer.Write(MqttPacketWriter.BuildFixedHeader(header));
+            writer.WriteVariableLengthInteger((uint)body.Length);
+            writer.Write(body, 0, body.Length);
+            return writer.GetBuffer();
+        }
+    }
+}
@@ -8,6 +8,7 @@ using System.Collections.Generic;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
+using MQTTnet.Exceptions;

 namespace MQTTnet.Tests
 {
@@ -16,6 +17,18 @@ namespace MQTTnet.Tests
    {
        public TestContext TestContext { get; set; }

+        [TestMethod]
+        [ExpectedException(typeof(MqttCommunicationException))]
+        public async Task Connect_To_Not_Existing_Server()
+        {
+            var client = new MqttFactory().CreateLowLevelMqttClient();
+            var options = new MqttClientOptionsBuilder()
+                .WithTcpServer("localhost")
+                .Build();
+
+            await client.ConnectAsync(options, CancellationToken.None).ConfigureAwait(false);
+        }
+
        [TestMethod]
        public async Task Connect_And_Disconnect()
        {
@@ -78,7 +91,7 @@ namespace MQTTnet.Tests

        async Task<MqttConnAckPacket> Authenticate(ILowLevelMqttClient client)
        {
-            await client.SendAsync(new MqttConnectPacket()
+            await client.SendAsync(new MqttConnectPacket
            {
                CleanSession = true,
                ClientId = TestContext.TestName,
@@ -6,9 +6,9 @@
  </PropertyGroup>

  <ItemGroup>
-    <PackageReference Include="MSTest.TestAdapter" Version="2.1.1" />
-    <PackageReference Include="MSTest.TestFramework" Version="2.1.1" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.6.0" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.1.2" />
+    <PackageReference Include="MSTest.TestFramework" Version="2.1.2" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.6.1" />
  </ItemGroup>

  <ItemGroup>
@@ -2,7 +2,6 @@
 using MQTTnet.Client;
 using MQTTnet.Client.Options;
 using MQTTnet.Diagnostics;
-using MQTTnet.Internal;
 using MQTTnet.Server;
 using System;
 using System.Collections.Generic;
@@ -11,13 +10,10 @@ using System.Threading.Tasks;

 namespace MQTTnet.Tests.Mockups
 {
-    public sealed class TestEnvironment : Disposable
+    public sealed class TestEnvironment : IDisposable
    {
        readonly MqttFactory _mqttFactory = new MqttFactory();
        readonly List<IMqttClient> _clients = new List<IMqttClient>();
-        readonly IMqttNetLogger _serverLogger = new MqttNetLogger("server");
-        readonly IMqttNetLogger _clientLogger = new MqttNetLogger("client");
-
        readonly List<string> _serverErrors = new List<string>();
        readonly List<string> _clientErrors = new List<string>();

@@ -31,9 +27,9 @@ namespace MQTTnet.Tests.Mockups

        public int ServerPort { get; set; } = 1888;

-        public IMqttNetLogger ServerLogger => _serverLogger;
+        public IMqttNetLogger ServerLogger { get; } = new MqttNetLogger("server");

-        public IMqttNetLogger ClientLogger => _clientLogger;
+        public IMqttNetLogger ClientLogger { get; } = new MqttNetLogger("client");

        public TestContext TestContext { get; }

@@ -45,7 +41,7 @@ namespace MQTTnet.Tests.Mockups
        {
            TestContext = testContext;

-            _serverLogger.LogMessagePublished += (s, e) =>
+            ServerLogger.LogMessagePublished += (s, e) =>
            {
                if (e.LogMessage.Level == MqttNetLogLevel.Error)
                {
@@ -56,7 +52,7 @@ namespace MQTTnet.Tests.Mockups
                }
            };

-            _clientLogger.LogMessagePublished += (s, e) =>
+            ClientLogger.LogMessagePublished += (s, e) =>
            {
                if (e.LogMessage.Level == MqttNetLogLevel.Error)
                {
@@ -70,7 +66,7 @@ namespace MQTTnet.Tests.Mockups

        public IMqttClient CreateClient()
        {
-            var client = _mqttFactory.CreateMqttClient(_clientLogger);
+            var client = _mqttFactory.CreateMqttClient(ClientLogger);
            _clients.Add(client);

            return new TestClientWrapper(client, TestContext);
@@ -83,13 +79,18 @@ namespace MQTTnet.Tests.Mockups

        public async Task<IMqttServer> StartServerAsync(MqttServerOptionsBuilder options)
        {
+            if (options == null) throw new ArgumentNullException(nameof(options));
+
            if (Server != null)
            {
                throw new InvalidOperationException("Server already started.");
            }

-            Server = new TestServerWrapper(_mqttFactory.CreateMqttServer(_serverLogger), TestContext, this);
-            await Server.StartAsync(options.WithDefaultEndpointPort(ServerPort).Build());
+            Server = new TestServerWrapper(_mqttFactory.CreateMqttServer(ServerLogger), TestContext, this);
+
+            options.WithDefaultEndpointPort(ServerPort);
+            
+            await Server.StartAsync(options.Build()).ConfigureAwait(false);

            return Server;
        }
@@ -106,7 +107,7 @@ namespace MQTTnet.Tests.Mockups
            options = options.WithTcpServer("localhost", ServerPort);

            var client = CreateClient();
-            await client.ConnectAsync(options.Build());
+            await client.ConnectAsync(options.Build()).ConfigureAwait(false);

            return client;
        }
@@ -116,7 +117,7 @@ namespace MQTTnet.Tests.Mockups
            if (options == null) throw new ArgumentNullException(nameof(options));

            var client = CreateClient();
-            await client.ConnectAsync(options);
+            await client.ConnectAsync(options).ConfigureAwait(false);

            return client;
        }
@@ -140,26 +141,22 @@ namespace MQTTnet.Tests.Mockups
            }
        }

-        protected override void Dispose(bool disposing)
+        public void Dispose()
        {
-            if (disposing)
+            foreach (var mqttClient in _clients)
            {
-                foreach (var mqttClient in _clients)
-                {
-                    mqttClient?.Dispose();
-                }
-
-                Server?.StopAsync().GetAwaiter().GetResult();
-
-                ThrowIfLogErrors();
-
-                if (_exceptions.Any())
-                {
-                    throw new Exception($"{_exceptions.Count} exceptions tracked.\r\n" + string.Join(Environment.NewLine, _exceptions));
-                }
+                mqttClient?.Dispose();
            }

-            base.Dispose(disposing);
+            Server?.StopAsync().GetAwaiter().GetResult();
+            Server?.Dispose();
+
+            ThrowIfLogErrors();
+
+            if (_exceptions.Any())
+            {
+                throw new Exception($"{_exceptions.Count} exceptions tracked.\r\n" + string.Join(Environment.NewLine, _exceptions));
+            }
        }

        public void TrackException(Exception exception)
@@ -132,5 +132,9 @@ namespace MQTTnet.Tests.Mockups
        {
            return Implementation.UnsubscribeAsync(clientId, topicFilters);
        }
+
+        public void Dispose()
+        {
+        }
    }
 }
@@ -96,7 +96,7 @@ namespace MQTTnet.Tests
        [TestMethod]
        public async Task Send_Reply_In_Message_Handler()
        {
-            using (var testEnvironment = new TestEnvironment(TestContext))
+            using (var testEnvironment = new TestEnvironment())
            {
                await testEnvironment.StartServerAsync();
                var client1 = await testEnvironment.ConnectClientAsync();
@@ -125,6 +125,8 @@ namespace MQTTnet.Tests

                await client1.PublishAsync("request", null, MqttQualityOfServiceLevel.AtLeastOnce);

+                await Task.Delay(500);
+
                SpinWait.SpinUntil(() => replyReceived, TimeSpan.FromSeconds(10));

                Assert.IsTrue(replyReceived);
@@ -6,6 +6,7 @@ using System.Text;
 using System.Threading;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using MQTTnet.Adapter;
+using MQTTnet.Exceptions;
 using MQTTnet.Formatter;
 using MQTTnet.Formatter.V3;
 using MQTTnet.Formatter.V5;
@@ -18,6 +19,31 @@ namespace MQTTnet.Tests
    [TestClass]
    public class MqttPacketSerializer_Tests
    {
+        [TestMethod]
+        public void DetectVersionFromMqttConnectPacket()
+        {
+            var p = new MqttConnectPacket
+            {
+                ClientId = "XYZ",
+                Password = Encoding.UTF8.GetBytes("PASS"),
+                Username = "USER",
+                KeepAlivePeriod = 123,
+                CleanSession = true
+            };
+            var adapter = new MqttPacketFormatterAdapter(WriterFactory());
+                        
+            Assert.AreEqual(MqttProtocolVersion.V310, DeserializeAndDetectVersion(adapter, Serialize(p, MqttProtocolVersion.V310)));
+            Assert.AreEqual(MqttProtocolVersion.V311, DeserializeAndDetectVersion(adapter, Serialize(p, MqttProtocolVersion.V311)));
+            Assert.AreEqual(MqttProtocolVersion.V500, DeserializeAndDetectVersion(adapter, Serialize(p, MqttProtocolVersion.V500)));
+            
+            var ex = Assert.ThrowsException<MqttProtocolViolationException>(() => DeserializeAndDetectVersion(adapter, WriterFactory().AddMqttHeader(MqttControlPacketType.Connect, new byte[0])));
+            Assert.AreEqual("CONNECT packet must have at least 7 bytes.", ex.Message);
+            ex = Assert.ThrowsException<MqttProtocolViolationException>(() => DeserializeAndDetectVersion(adapter, WriterFactory().AddMqttHeader(MqttControlPacketType.Connect, new byte[7])));
+            Assert.AreEqual("Protocol '' not supported.", ex.Message);
+            ex = Assert.ThrowsException<MqttProtocolViolationException>(() => DeserializeAndDetectVersion(adapter, WriterFactory().AddMqttHeader(MqttControlPacketType.Connect, new byte[] { 255, 255, 0,0,0,0,0 })));
+            Assert.AreEqual("Expected at least 65537 bytes but there are only 7 bytes", ex.Message);
+        }
+
        [TestMethod]
        public void SerializeV310_MqttConnectPacket()
        {
@@ -156,7 +182,7 @@ namespace MQTTnet.Tests
        [TestMethod]
        public void Serialize_LargePacket()
        {
-            var serializer = new MqttV311PacketFormatter(new MqttPacketWriter());
+            var serializer = new MqttV311PacketFormatter(WriterFactory());

            const int payloadLength = 80000;

@@ -555,25 +581,15 @@ namespace MQTTnet.Tests
            DeserializeAndCompare(p, "sAIAew==");
        }

-        private static void SerializeAndCompare(MqttBasePacket packet, string expectedBase64Value, MqttProtocolVersion protocolVersion = MqttProtocolVersion.V311)
+        private void SerializeAndCompare(MqttBasePacket packet, string expectedBase64Value, MqttProtocolVersion protocolVersion = MqttProtocolVersion.V311)
        {
-            IMqttPacketFormatter serializer;
-            if (protocolVersion == MqttProtocolVersion.V311)
-            {
-                serializer = new MqttV311PacketFormatter(new MqttPacketWriter());
-            }
-            else if (protocolVersion == MqttProtocolVersion.V310)
-            {
-                serializer = new MqttV310PacketFormatter(new MqttPacketWriter());
-            }
-            else
-            {
-                throw new NotSupportedException();
-            }
+            Assert.AreEqual(expectedBase64Value, Convert.ToBase64String(Serialize(packet, protocolVersion)));
+        }

-            var data = serializer.Encode(packet);
-
-            Assert.AreEqual(expectedBase64Value, Convert.ToBase64String(Join(data)));
+        private byte[] Serialize(MqttBasePacket packet, MqttProtocolVersion protocolVersion = MqttProtocolVersion.V311)
+        {
+            var serializer = MqttPacketFormatterAdapter.GetMqttPacketFormatter(protocolVersion, WriterFactory());
+            return Join(serializer.Encode(packet));
        }

        protected virtual IMqttPacketWriter WriterFactory()
@@ -635,6 +651,25 @@ namespace MQTTnet.Tests
            }
        }

+        private MqttProtocolVersion DeserializeAndDetectVersion(MqttPacketFormatterAdapter adapter, byte[] buffer)
+        {
+            using (var headerStream = new MemoryStream(buffer))
+            {
+                var channel = new TestMqttChannel(headerStream);
+                var fixedHeader = new byte[2];
+
+                var header = new MqttPacketReader(channel).ReadFixedHeaderAsync(fixedHeader, CancellationToken.None).GetAwaiter().GetResult().FixedHeader;
+
+                using (var bodyStream = new MemoryStream(buffer, (int)headerStream.Position, (int)header.RemainingLength))
+                {
+                    var reader = ReaderFactory(bodyStream.ToArray());
+                    var packet = new ReceivedMqttPacket(header.Flags, reader, 0);
+                    adapter.DetectProtocolVersion(packet);
+                    return adapter.ProtocolVersion;
+                }
+            }
+        }
+
        private static byte[] Join(params ArraySegment<byte>[] chunks)
        {
            var buffer = new MemoryStream();
@@ -6,10 +6,15 @@ namespace MQTTnet.Tests
    [TestClass]
    public class MqttPacketWriter_Tests
    {
+        protected virtual IMqttPacketWriter WriterFactory()
+        {
+            return new MqttPacketWriter();
+        }
+
        [TestMethod]
        public void WritePacket()
        {
-            var writer = new MqttPacketWriter();
+            var writer = WriterFactory();
            Assert.AreEqual(0, writer.Length);

            writer.WriteWithLengthPrefix("1234567890");
@@ -274,6 +274,82 @@ namespace MQTTnet.Tests
            }
        }

+        [TestMethod]
+        public async Task Subscribe_Lots_In_Single_Request()
+        {
+            using (var testEnvironment = new TestEnvironment(TestContext))
+            {
+                var receivedMessagesCount = 0;
+
+                await testEnvironment.StartServerAsync();
+
+                var c1 = await testEnvironment.ConnectClientAsync();
+                c1.UseApplicationMessageReceivedHandler(c => Interlocked.Increment(ref receivedMessagesCount));
+
+                var optionsBuilder = new MqttClientSubscribeOptionsBuilder();
+                for (var i = 0; i < 500; i++)
+                {
+                    optionsBuilder.WithTopicFilter(i.ToString(), MqttQualityOfServiceLevel.AtMostOnce);
+                }
+
+                await c1.SubscribeAsync(optionsBuilder.Build()).ConfigureAwait(false);
+
+                var c2 = await testEnvironment.ConnectClientAsync();
+
+                var messageBuilder = new MqttApplicationMessageBuilder();
+                for (var i = 0; i < 500; i++)
+                {
+                    messageBuilder.WithTopic(i.ToString());
+
+                    await c2.PublishAsync(messageBuilder.Build()).ConfigureAwait(false);
+                }
+
+                SpinWait.SpinUntil(() => receivedMessagesCount == 500, 5000);
+
+                Assert.AreEqual(500, receivedMessagesCount);
+            }
+        }
+
+        [TestMethod]
+        public async Task Subscribe_Lots_In_Multiple_Requests()
+        {
+            using (var testEnvironment = new TestEnvironment(TestContext))
+            {
+                var receivedMessagesCount = 0;
+
+                await testEnvironment.StartServerAsync();
+
+                var c1 = await testEnvironment.ConnectClientAsync();
+                c1.UseApplicationMessageReceivedHandler(c => Interlocked.Increment(ref receivedMessagesCount));
+
+                for (var i = 0; i < 500; i++)
+                {
+                    var so = new MqttClientSubscribeOptionsBuilder()
+                        .WithTopicFilter(i.ToString()).Build();
+
+                    await c1.SubscribeAsync(so).ConfigureAwait(false);
+
+                    await Task.Delay(10);
+                }
+                
+                var c2 = await testEnvironment.ConnectClientAsync();
+
+                var messageBuilder = new MqttApplicationMessageBuilder();
+                for (var i = 0; i < 500; i++)
+                {
+                    messageBuilder.WithTopic(i.ToString());
+
+                    await c2.PublishAsync(messageBuilder.Build()).ConfigureAwait(false);
+
+                    await Task.Delay(10);
+                }
+
+                SpinWait.SpinUntil(() => receivedMessagesCount == 500, 5000);
+
+                Assert.AreEqual(500, receivedMessagesCount);
+            }
+        }
+
        [TestMethod]
        public async Task Subscribe_Multiple_In_Multiple_Request()
        {
@@ -1312,5 +1388,32 @@ namespace MQTTnet.Tests
                Assert.AreEqual(expectedReceivedMessagesCount, receivedMessagesCount);
            }
        }
+
+        [TestMethod]
+        public async Task Intercept_Undelivered()
+        {
+            using (var testEnvironment = new TestEnvironment())
+            {
+                var undeliverd = string.Empty;
+
+                var options = new MqttServerOptionsBuilder().WithUndeliveredMessageInterceptor(
+                    context =>
+                    {
+                        undeliverd = context.ApplicationMessage.Topic;
+                    });
+
+                await testEnvironment.StartServerAsync(options);
+
+                var client = await testEnvironment.ConnectClientAsync();
+
+                await client.SubscribeAsync("b");
+
+                await client.PublishAsync("a", null, MqttQualityOfServiceLevel.ExactlyOnce);
+
+                await Task.Delay(500);
+
+                Assert.AreEqual("a", undeliverd);
+            }
+        }
    }
 }
@@ -0,0 +1,10 @@
+<Router AppAssembly="@typeof(Program).Assembly">
+    <Found Context="routeData">
+        <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
+    </Found>
+    <NotFound>
+        <LayoutView Layout="@typeof(MainLayout)">
+            <p>Sorry, there's nothing at this address.</p>
+        </LayoutView>
+    </NotFound>
+</Router>
@@ -0,0 +1,20 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.1</TargetFramework>
+    <RazorLangVersion>3.0</RazorLangVersion>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="3.2.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.Build" Version="3.2.0" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="3.2.0" PrivateAssets="all" />
+    <PackageReference Include="System.Net.Http.Json" Version="3.2.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\Source\MQTTnet\MQTTnet.csproj" />
+    <ProjectReference Include="..\Shared\MQTTnet.Test.BlazorApp.Shared.csproj" />
+  </ItemGroup>
+
+</Project>
@@ -0,0 +1,27 @@
+@page "/counter"
+@using MQTTnet.Client.Options
+@using System.Threading
+
+<h1>Counter</h1>
+
+<p>Current count: @currentCount</p>
+
+<button class="btn btn-primary" @onclick="IncrementCount">Click me</button>
+
+@code {
+    private int currentCount = 0;
+
+    private async Task IncrementCount()
+    {
+        var mqttFactory = new MqttFactory();
+        var client = mqttFactory.CreateMqttClient();
+
+        var options = new MqttClientOptionsBuilder()
+            .WithWebSocketServer("192.168.1.15:80/mqtt")
+            .Build();
+
+        await client.ConnectAsync(options, CancellationToken.None);
+        
+        currentCount++;
+    }
+}
@@ -0,0 +1,46 @@
+@page "/fetchdata"
+@using MQTTnet.Test.BlazorApp.Shared
+@inject HttpClient Http
+
+<h1>Weather forecast</h1>
+
+<p>This component demonstrates fetching data from the server.</p>
+
+@if (forecasts == null)
+{
+    <p><em>Loading...</em></p>
+}
+else
+{
+    <table class="table">
+        <thead>
+            <tr>
+                <th>Date</th>
+                <th>Temp. (C)</th>
+                <th>Temp. (F)</th>
+                <th>Summary</th>
+            </tr>
+        </thead>
+        <tbody>
+            @foreach (var forecast in forecasts)
+            {
+                <tr>
+                    <td>@forecast.Date.ToShortDateString()</td>
+                    <td>@forecast.TemperatureC</td>
+                    <td>@forecast.TemperatureF</td>
+                    <td>@forecast.Summary</td>
+                </tr>
+            }
+        </tbody>
+    </table>
+}
+
+@code {
+    private WeatherForecast[] forecasts;
+
+    protected override async Task OnInitializedAsync()
+    {
+        forecasts = await Http.GetFromJsonAsync<WeatherForecast[]>("WeatherForecast");
+    }
+
+}
@@ -0,0 +1,7 @@
+@page "/"
+
+<h1>Hello, world!</h1>
+
+Welcome to your new app.
+
+<SurveyPrompt Title="How is Blazor working for you?" />
@@ -0,0 +1,21 @@
+using System;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace MQTTnet.Test.BlazorApp.Client
+{
+    public static class Program
+    {
+        public static Task Main(string[] args)
+        {
+            var builder = WebAssemblyHostBuilder.CreateDefault(args);
+            builder.RootComponents.Add<App>("app");
+
+            builder.Services.AddTransient(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });
+
+            return builder.Build().RunAsync();
+        }
+    }
+}
@@ -0,0 +1,15 @@
+@inherits LayoutComponentBase
+
+<div class="sidebar">
+    <NavMenu />
+</div>
+
+<div class="main">
+    <div class="top-row px-4">
+        <a href="http://blazor.net" target="_blank" class="ml-md-auto">About</a>
+    </div>
+
+    <div class="content px-4">
+        @Body
+    </div>
+</div>
@@ -0,0 +1,37 @@
+<div class="top-row pl-4 navbar navbar-dark">
+    <a class="navbar-brand" href="">MQTTnet.Test.BlazorApp</a>
+    <button class="navbar-toggler" @onclick="ToggleNavMenu">
+        <span class="navbar-toggler-icon"></span>
+    </button>
+</div>
+
+<div class="@NavMenuCssClass" @onclick="ToggleNavMenu">
+    <ul class="nav flex-column">
+        <li class="nav-item px-3">
+            <NavLink class="nav-link" href="" Match="NavLinkMatch.All">
+                <span class="oi oi-home" aria-hidden="true"></span> Home
+            </NavLink>
+        </li>
+        <li class="nav-item px-3">
+            <NavLink class="nav-link" href="counter">
+                <span class="oi oi-plus" aria-hidden="true"></span> Counter
+            </NavLink>
+        </li>
+        <li class="nav-item px-3">
+            <NavLink class="nav-link" href="fetchdata">
+                <span class="oi oi-list-rich" aria-hidden="true"></span> Fetch data
+            </NavLink>
+        </li>
+    </ul>
+</div>
+
+@code {
+    private bool collapseNavMenu = true;
+
+    private string NavMenuCssClass => collapseNavMenu ? "collapse" : null;
+
+    private void ToggleNavMenu()
+    {
+        collapseNavMenu = !collapseNavMenu;
+    }
+}
@@ -0,0 +1,16 @@
+<div class="alert alert-secondary mt-4" role="alert">
+    <span class="oi oi-pencil mr-2" aria-hidden="true"></span>
+    <strong>@Title</strong>
+
+    <span class="text-nowrap">
+        Please take our
+        <a target="_blank" class="font-weight-bold" href="https://go.microsoft.com/fwlink/?linkid=2127996">brief survey</a>
+    </span>
+    and tell us what you think.
+</div>
+
+@code {
+    // Demonstrates how a parent component can supply parameters
+    [Parameter]
+    public string Title { get; set; }
+}
@@ -0,0 +1,9 @@
+@using System.Net.Http
+@using System.Net.Http.Json
+@using Microsoft.AspNetCore.Components.Forms
+@using Microsoft.AspNetCore.Components.Routing
+@using Microsoft.AspNetCore.Components.Web
+@using Microsoft.AspNetCore.Components.WebAssembly.Http
+@using Microsoft.JSInterop
+@using MQTTnet.Test.BlazorApp.Client
+@using MQTTnet.Test.BlazorApp.Client.Shared
@@ -0,0 +1,183 @@
+@import url('open-iconic/font/css/open-iconic-bootstrap.min.css');
+
+html, body {
+    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
+}
+
+a, .btn-link {
+    color: #0366d6;
+}
+
+.btn-primary {
+    color: #fff;
+    background-color: #1b6ec2;
+    border-color: #1861ac;
+}
+
+app {
+    position: relative;
+    display: flex;
+    flex-direction: column;
+}
+
+.top-row {
+    height: 3.5rem;
+    display: flex;
+    align-items: center;
+}
+
+.main {
+    flex: 1;
+}
+
+    .main .top-row {
+        background-color: #f7f7f7;
+        border-bottom: 1px solid #d6d5d5;
+        justify-content: flex-end;
+    }
+
+        .main .top-row > a, .main .top-row .btn-link {
+            white-space: nowrap;
+            margin-left: 1.5rem;
+        }
+
+.main .top-row a:first-child {
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+
+.sidebar {
+    background-image: linear-gradient(180deg, rgb(5, 39, 103) 0%, #3a0647 70%);
+}
+
+    .sidebar .top-row {
+        background-color: rgba(0,0,0,0.4);
+    }
+
+    .sidebar .navbar-brand {
+        font-size: 1.1rem;
+    }
+
+    .sidebar .oi {
+        width: 2rem;
+        font-size: 1.1rem;
+        vertical-align: text-top;
+        top: -2px;
+    }
+
+    .sidebar .nav-item {
+        font-size: 0.9rem;
+        padding-bottom: 0.5rem;
+    }
+
+        .sidebar .nav-item:first-of-type {
+            padding-top: 1rem;
+        }
+
+        .sidebar .nav-item:last-of-type {
+            padding-bottom: 1rem;
+        }
+
+        .sidebar .nav-item a {
+            color: #d7d7d7;
+            border-radius: 4px;
+            height: 3rem;
+            display: flex;
+            align-items: center;
+            line-height: 3rem;
+        }
+
+            .sidebar .nav-item a.active {
+                background-color: rgba(255,255,255,0.25);
+                color: white;
+            }
+
+            .sidebar .nav-item a:hover {
+                background-color: rgba(255,255,255,0.1);
+                color: white;
+            }
+
+.content {
+    padding-top: 1.1rem;
+}
+
+.navbar-toggler {
+    background-color: rgba(255, 255, 255, 0.1);
+}
+
+.valid.modified:not([type=checkbox]) {
+    outline: 1px solid #26b050;
+}
+
+.invalid {
+    outline: 1px solid red;
+}
+
+.validation-message {
+    color: red;
+}
+
+#blazor-error-ui {
+    background: lightyellow;
+    bottom: 0;
+    box-shadow: 0 -1px 2px rgba(0, 0, 0, 0.2);
+    display: none;
+    left: 0;
+    padding: 0.6rem 1.25rem 0.7rem 1.25rem;
+    position: fixed;
+    width: 100%;
+    z-index: 1000;
+}
+
+#blazor-error-ui .dismiss {
+    cursor: pointer;
+    position: absolute;
+    right: 0.75rem;
+    top: 0.5rem;
+}
+
+@media (max-width: 767.98px) {
+    .main .top-row:not(.auth) {
+        display: none;
+    }
+
+    .main .top-row.auth {
+        justify-content: space-between;
+    }
+
+    .main .top-row a, .main .top-row .btn-link {
+        margin-left: 0;
+    }
+}
+
+@media (min-width: 768px) {
+    app {
+        flex-direction: row;
+    }
+
+    .sidebar {
+        width: 250px;
+        height: 100vh;
+        position: sticky;
+        top: 0;
+    }
+
+    .main .top-row {
+        position: sticky;
+        top: 0;
+    }
+
+    .main > div {
+        padding-left: 2rem !important;
+        padding-right: 1.5rem !important;
+    }
+
+    .navbar-toggler {
+        display: none;
+    }
+
+    .sidebar .collapse {
+        /* Never collapse the sidebar for wide screens */
+        display: block;
+    }
+}
@@ -0,0 +1,86 @@
+SIL OPEN FONT LICENSE Version 1.1
+
+Copyright (c) 2014 Waybury
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded,
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Waybury
+
+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.
@@ -0,0 +1,114 @@
+[Open Iconic v1.1.1](http://useiconic.com/open)
+===========
+
+### Open Iconic is the open source sibling of [Iconic](http://useiconic.com). It is a hyper-legible collection of 223 icons with a tiny footprint&mdash;ready to use with Bootstrap and Foundation. [View the collection](http://useiconic.com/open#icons)
+
+
+
+## What's in Open Iconic?
+
+* 223 icons designed to be legible down to 8 pixels
+* Super-light SVG files - 61.8 for the entire set 
+* SVG sprite&mdash;the modern replacement for icon fonts
+* Webfont (EOT, OTF, SVG, TTF, WOFF), PNG and WebP formats
+* Webfont stylesheets (including versions for Bootstrap and Foundation) in CSS, LESS, SCSS and Stylus formats
+* PNG and WebP raster images in 8px, 16px, 24px, 32px, 48px and 64px.
+
+
+## Getting Started
+
+#### For code samples and everything else you need to get started with Open Iconic, check out our [Icons](http://useiconic.com/open#icons) and [Reference](http://useiconic.com/open#reference) sections.
+
+### General Usage
+
+#### Using Open Iconic's SVGs
+
+We like SVGs and we think they're the way to display icons on the web. Since Open Iconic are just basic SVGs, we suggest you display them like you would any other image (don't forget the `alt` attribute).
+
+```
+<img src="/open-iconic/svg/icon-name.svg" alt="icon name">
+```
+
+#### Using Open Iconic's SVG Sprite
+
+Open Iconic also comes in a SVG sprite which allows you to display all the icons in the set with a single request. It's like an icon font, without being a hack.
+
+Adding an icon from an SVG sprite is a little different than what you're used to, but it's still a piece of cake. *Tip: To make your icons easily style able, we suggest adding a general class to the* `<svg>` *tag and a unique class name for each different icon in the* `<use>` *tag.*  
+
+```
+<svg class="icon">
+  <use xlink:href="open-iconic.svg#account-login" class="icon-account-login"></use>
+</svg>
+```
+
+Sizing icons only needs basic CSS. All the icons are in a square format, so just set the `<svg>` tag with equal width and height dimensions.
+
+```
+.icon {
+  width: 16px;
+  height: 16px;
+}
+```
+
+Coloring icons is even easier. All you need to do is set the `fill` rule on the `<use>` tag.
+
+```
+.icon-account-login {
+  fill: #f00;
+}
+```
+
+To learn more about SVG Sprites, read [Chris Coyier's guide](http://css-tricks.com/svg-sprites-use-better-icon-fonts/).
+
+#### Using Open Iconic's Icon Font...
+
+
+##### …with Bootstrap
+
+You can find our Bootstrap stylesheets in `font/css/open-iconic-bootstrap.{css, less, scss, styl}`
+
+
+```
+<link href="/open-iconic/font/css/open-iconic-bootstrap.css" rel="stylesheet">
+```
+
+
+```
+<span class="oi oi-icon-name" title="icon name" aria-hidden="true"></span>
+```
+
+##### …with Foundation
+
+You can find our Foundation stylesheets in `font/css/open-iconic-foundation.{css, less, scss, styl}`
+
+```
+<link href="/open-iconic/font/css/open-iconic-foundation.css" rel="stylesheet">
+```
+
+
+```
+<span class="fi-icon-name" title="icon name" aria-hidden="true"></span>
+```
+
+##### …on its own
+
+You can find our default stylesheets in `font/css/open-iconic.{css, less, scss, styl}`
+
+```
+<link href="/open-iconic/font/css/open-iconic.css" rel="stylesheet">
+```
+
+```
+<span class="oi" data-glyph="icon-name" title="icon name" aria-hidden="true"></span>
+```
+
+
+## License
+
+### Icons
+
+All code (including SVG markup) is under the [MIT License](http://opensource.org/licenses/MIT).
+
+### Fonts
+
+All fonts are under the [SIL Licensed](http://scripts.sil.org/cms/scripts/page.php?item_id=OFL_web).
@@ -0,0 +1,543 @@
+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" >
+<!--
+2014-7-1: Created.
+-->
+<svg xmlns="http://www.w3.org/2000/svg">
+<metadata>
+Created by FontForge 20120731 at Tue Jul  1 20:39:22 2014
+ By P.J. Onori
+Created by P.J. Onori with FontForge 2.0 (http://fontforge.sf.net)
+</metadata>
+<defs>
+<font id="open-iconic" horiz-adv-x="800" >
+  <font-face 
+    font-family="Icons"
+    font-weight="400"
+    font-stretch="normal"
+    units-per-em="800"
+    panose-1="2 0 5 3 0 0 0 0 0 0"
+    ascent="800"
+    descent="0"
+    bbox="-0.5 -101 802 800.126"
+    underline-thickness="50"
+    underline-position="-100"
+    unicode-range="U+E000-E0DE"
+  />
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+  </font>
+</defs></svg>
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
+    <title>MQTTnet.Test.BlazorApp</title>
+    <base href="/" />
+    <link href="css/bootstrap/bootstrap.min.css" rel="stylesheet" />
+    <link href="css/app.css" rel="stylesheet" />
+</head>
+
+<body>
+    <app>Loading...</app>
+
+    <div id="blazor-error-ui">
+        An unhandled error has occurred.
+        <a href="" class="reload">Reload</a>
+        <a class="dismiss">🗙</a>
+    </div>
+    <script src="_framework/blazor.webassembly.js"></script>
+</body>
+
+</html>
@@ -0,0 +1,40 @@
+using MQTTnet.Test.BlazorApp.Shared;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Logging;
+
+namespace MQTTnet.Test.BlazorApp.Server.Controllers
+{
+    [ApiController]
+    [Route("[controller]")]
+    public class WeatherForecastController : ControllerBase
+    {
+        private static readonly string[] Summaries = new[]
+        {
+            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
+        };
+
+        private readonly ILogger<WeatherForecastController> logger;
+
+        public WeatherForecastController(ILogger<WeatherForecastController> logger)
+        {
+            this.logger = logger;
+        }
+
+        [HttpGet]
+        public IEnumerable<WeatherForecast> Get()
+        {
+            var rng = new Random();
+            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
+            {
+                Date = DateTime.Now.AddDays(index),
+                TemperatureC = rng.Next(-20, 55),
+                Summary = Summaries[rng.Next(Summaries.Length)]
+            })
+            .ToArray();
+        }
+    }
+}
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Christian Kratky	6b6627f823	Fix null ref exception in low level client.	2020-08-05 20:49:11 +02:00
Christian Kratky	4f51a238b3	Fix UnitTests	2020-07-26 20:07:52 +02:00
Christian Kratky	733c587e45	Fix Unit Tests.	2020-07-26 12:01:33 +02:00
Christian Kratky	3260920828	Fix UnitTests	2020-07-25 23:47:29 +02:00
Christian Kratky	4e6aeb91a4	Fix server adapter memory leak and UnitTests	2020-07-25 23:34:30 +02:00
Christian Kratky	5056843611	Fix UnitTests.	2020-07-25 14:21:09 +02:00
Christian Kratky	a65c015a58	Refactor exception message.	2020-07-25 13:43:26 +02:00
Christian	e63f26789f	Merge pull request #959 from Mephistofeles/ManagedMqttClientExtensions Modified ManagedMqttClientExtensions to work on less specific interfaces	2020-07-25 13:32:31 +02:00
Christian	9a598892a7	Merge pull request #954 from JanEggers/fix#788 improve exceptions in case of corrupt packages	2020-07-25 13:30:54 +02:00
Paweł Słowik	857ab005be	Modified IManagedMqttClient extension methods to work on less specific interfaces (IApplicationMessagePublisher and IApplicationMessageReceiver)	2020-07-18 18:25:16 +02:00
JanEggers	33e4ec1943	improve exceptions in case of corrupt packages close pipes after exception occoured to avoid lingering connections should fix #788	2020-07-09 21:19:00 +02:00
Christian Kratky	6a564a0c72	Align nuget dependency versions and project references.	2020-07-04 17:04:36 +02:00
Christian	3a4dce5080	Update MQTTnet.nuspec	2020-06-28 00:17:30 +02:00
Christian	4e6118d324	Merge pull request #946 from JTOne123/master [PR] The proj files have been updated to enable SourceLink	2020-06-27 23:10:39 +02:00
Pavlo Datsiuk	269bfa09ac	[COMMIT] The proj files have been updated to enable SourceLink [MQTTnet.AspNetCore.csproj]	2020-06-25 12:53:00 +03:00
Pavlo Datsiuk	59dd6b98a3	[COMMIT] The proj files have been updated to enable SourceLink [MQTTnet.csproj]	2020-06-25 12:52:58 +03:00
Pavlo Datsiuk	9f37306f20	[COMMIT] The proj files have been updated to enable SourceLink [MQTTnet.Extensions.WebSocket4Net.csproj]	2020-06-25 12:52:55 +03:00
Pavlo Datsiuk	85b000c6b7	[COMMIT] The proj files have been updated to enable SourceLink [MQTTnet.Extensions.Rpc.csproj]	2020-06-25 12:52:52 +03:00
Pavlo Datsiuk	5a919ce5d2	[COMMIT] The proj files have been updated to enable SourceLink [MQTTnet.Extensions.ManagedClient.csproj]	2020-06-25 12:52:49 +03:00
Christian	57ab8e5abc	Merge pull request #941 from chkr1011/disconnect-reason-codes Added missing disconnect reason codes.	2020-06-18 20:25:16 +02:00
SeppPenner	8f6d48be81	Adjusted ImplementationSpecificError to be UnspecifiedError reason code in the MqttClient.	2020-06-18 10:03:44 +02:00
Christian	38cfa15cc3	Merge pull request #938 from chkr1011/interceptor-undelivered Added interceptor for undelivered messages.	2020-06-15 23:13:06 +02:00
SeppPenner	6adf7096ec	Updated client sessions manager to handle the delivery count for the handler correctly.	2020-06-12 20:25:51 +02:00
SeppPenner	df149eb0b3	Added reason code to MqttClientDisconnectedEventArgs and use it.	2020-06-12 20:21:23 +02:00
Christian Kratky	63c9329190	Merge remote-tracking branch 'origin/master'	2020-06-12 11:19:36 +02:00
Christian Kratky	246a10649a	Minor refactorings.	2020-06-12 11:19:29 +02:00
SeppPenner	0a76ac15c6	Added missing disconnect reason codes.	2020-06-11 18:06:24 +02:00
HansM	d801af5616	Merge branch 'master' into interceptor-undelivered	2020-06-11 12:46:02 +02:00
SeppPenner	257211fc7a	Moved undeliveredMessageInterceptor to local variable to avoid threading issues.	2020-06-11 12:41:48 +02:00
SeppPenner	a407fc381b	Made deliveryCount a local variable.	2020-06-11 12:39:56 +02:00
Christian	4fa275bf2b	Merge pull request #937 from chkr1011/fix-writeasync-nre Added checks for null references in the MqttTcpChannel.	2020-06-10 21:09:48 +02:00
SeppPenner	7cf12dc751	Made delivery count internal.	2020-06-10 18:45:15 +02:00
SeppPenner	40aefd0ad3	Added local variable to avoid that the solution is not threadsafe.	2020-06-10 12:00:34 +02:00
SeppPenner	c20142671f	MQTTnet: Adjusted UndeliveredMessageInterceptor handler to return if it's null instead of throwing an exception.	2020-06-10 11:52:55 +02:00
SeppPenner	75dfe68a94	Added interceptor for undelivered messages.	2020-06-09 20:54:42 +02:00
Christian	92518fc4ec	Merge pull request #935 from JanEggers/fixedParallelWrites fixed parallel writes #932	2020-05-27 21:44:26 +02:00
JanEggers	16180e83ba	fixed parallel writes #932	2020-05-27 20:38:34 +02:00
Christian Kratky	c779b394f1	Add abstraction layer for server certificate.	2020-05-26 23:46:43 +02:00
Christian Kratky	e60a732b61	Merge remote-tracking branch 'origin/master'	2020-05-26 23:17:10 +02:00
Christian Kratky	7ea9415c63	Add proper state checks for server API.	2020-05-26 23:17:06 +02:00
Christian	13c399bc9a	Merge pull request #895 from borigas/x509Cert Add an x509 certificate parameter	2020-05-26 23:14:23 +02:00
Christian Kratky	4565c3990a	Fix Blazor projects.	2020-05-25 22:33:05 +02:00
Christian Kratky	2bd2648b48	Merge remote-tracking branch 'origin/master'	2020-05-25 22:31:11 +02:00
Christian Kratky	1b56155f1c	Add Blazor test app.	2020-05-25 22:31:07 +02:00
Christian	626930cfae	Update README.md	2020-05-24 16:37:02 +02:00
Christian	6cf9cb0af2	Update README.md	2020-05-24 16:36:54 +02:00
Christian Kratky	60941c04e5	Add new factory overloads.	2020-05-22 22:02:05 +02:00
Christian Kratky	ba68b1274b	Merge remote-tracking branch 'origin/master'	2020-05-21 12:40:56 +02:00
Christian Kratky	dbe12b9c48	General code refactoring.	2020-05-21 12:40:51 +02:00
Christian	52b79a140b	Merge pull request #930 from prime167/patch-1 Update MqttTopicFilterBuilder.cs	2020-05-21 12:38:17 +02:00
Jeff Zhou	c270225e9e	Update MqttTopicFilterBuilder.cs Fix TopicFilterBuilder obsolete message	2020-05-21 09:35:07 +08:00
Christian Kratky	3f5d4e9825	Added MQTT JS examples for MQTTnet.Server.	2020-05-16 20:59:54 +02:00
Christian Kratky	e80d19ba9b	Update docs.	2020-05-16 13:01:50 +02:00
Christian Kratky	48837529a2	Fix web socket sub protocol negotiation.	2020-05-16 13:01:41 +02:00
Christian Kratky	43e3ad4c00	Add support for static files.	2020-05-16 13:01:12 +02:00
Christian Kratky	08c9ecb011	Fix wrong keep alive delay calculation.	2020-05-16 10:32:50 +02:00
Ben Origas	fc3965f5a3	Also Wrap certificate namespace in a !UWP compiler directive in options builder	2020-04-15 10:00:25 -05:00
Ben Origas	1d553c5ece	Wrap certificate namespace in a !UWP compiler directive	2020-04-15 09:57:06 -05:00
Ben Origas	07ad9fc557	Add exception if both Certificate and X509Certificate are set	2020-04-15 09:55:23 -05:00
Ben Origas	88e8691ce0	Move server x509 certs into non-uwp compiler flags	2020-04-10 17:16:42 -05:00
Ben Origas	28641892f5	Add an x509 certificate parameter	2020-04-10 17:16:42 -05:00