Add an event to receive all application messages at server level.

MQTTnet.Core/Client/MqttApplicationMessageReceivedEventArgs.cs

@@ -1,6 +1,6 @@
 using System;
 
-namespace MQTTnet.Core
+namespace MQTTnet.Core.Client
 {
     public sealed class MqttApplicationMessageReceivedEventArgs : EventArgs
     {

MQTTnet.Core/Client/MqttClient.cs

@@ -234,13 +234,7 @@ namespace MQTTnet.Core.Client
                 _processedPublishPackets.Add(publishPacket.PacketIdentifier);
             }
 
-            var applicationMessage = new MqttApplicationMessage(
-                publishPacket.Topic,
-                publishPacket.Payload,
-                publishPacket.QualityOfServiceLevel,
-                publishPacket.Retain
-            );
-
+            var applicationMessage = publishPacket.ToApplicationMessage();
             ApplicationMessageReceived?.Invoke(this, new MqttApplicationMessageReceivedEventArgs(applicationMessage));
         }
 

MQTTnet.Core/Internal/MqttApplicationMessageExtensions.cs

@@ -4,6 +4,16 @@ namespace MQTTnet.Core.Internal
 {
     internal static class MqttApplicationMessageExtensions
     {
+        public static MqttApplicationMessage ToApplicationMessage(this MqttPublishPacket publishPacket)
+        {
+            return new MqttApplicationMessage(
+                publishPacket.Topic,
+                publishPacket.Payload,
+                publishPacket.QualityOfServiceLevel,
+                publishPacket.Retain
+            );
+        }
+
         public static MqttPublishPacket ToPublishPacket(this MqttApplicationMessage applicationMessage)
         {
             if (applicationMessage == null)

MQTTnet.Core/Server/MqttApplicationMessageReceivedEventArgs.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace MQTTnet.Core.Server
+{
+    public sealed class MqttApplicationMessageReceivedEventArgs : EventArgs
+    {
+        public MqttApplicationMessageReceivedEventArgs(string clientId, MqttApplicationMessage applicationMessage)
+        {
+            ClientId = clientId;
+            ApplicationMessage = applicationMessage ?? throw new ArgumentNullException(nameof(applicationMessage));
+        }
+
+        public string ClientId { get; }
+
+        public MqttApplicationMessage ApplicationMessage { get; }
+    }
+}

MQTTnet.Core/Server/MqttClientSession.cs

@@ -19,20 +19,23 @@ namespace MQTTnet.Core.Server
         private readonly MqttClientMessageQueue _messageQueue;
         private readonly Action<MqttClientSession, MqttPublishPacket> _publishPacketReceivedCallback;
         private readonly MqttServerOptions _options;
-
+        
         private CancellationTokenSource _cancellationTokenSource;
         private IMqttCommunicationAdapter _adapter;
         private string _identifier;
         private MqttApplicationMessage _willApplicationMessage;
 
-        public MqttClientSession(MqttServerOptions options, Action<MqttClientSession, MqttPublishPacket> publishPacketReceivedCallback)
+        public MqttClientSession(string clientId, MqttServerOptions options, Action<MqttClientSession, MqttPublishPacket> publishPacketReceivedCallback)
         {
+            ClientId = clientId;
             _options = options ?? throw new ArgumentNullException(nameof(options));
             _publishPacketReceivedCallback = publishPacketReceivedCallback ?? throw new ArgumentNullException(nameof(publishPacketReceivedCallback));
 
             _messageQueue = new MqttClientMessageQueue(options);
         }
 
+        public string ClientId { get; }
+
         public bool IsConnected => _adapter != null;
 
         public async Task RunAsync(string identifier, MqttApplicationMessage willApplicationMessage, IMqttCommunicationAdapter adapter)

MQTTnet.Core/Server/MqttClientSessionsManager.cs

@@ -5,6 +5,7 @@ using System.Threading.Tasks;
 using MQTTnet.Core.Adapter;
 using MQTTnet.Core.Diagnostics;
 using MQTTnet.Core.Exceptions;
+using MQTTnet.Core.Internal;
 using MQTTnet.Core.Packets;
 using MQTTnet.Core.Protocol;
 
@@ -21,6 +22,8 @@ namespace MQTTnet.Core.Server
             _options = options ?? throw new ArgumentNullException(nameof(options));
         }
 
+        public event EventHandler<MqttApplicationMessageReceivedEventArgs> ApplicationMessageReceived; 
+
         public async Task RunClientSessionAsync(MqttClientConnectedEventArgs eventArgs)
         {
             try
@@ -114,7 +117,7 @@ namespace MQTTnet.Core.Server
                 {
                     isExistingSession = false;
 
-                    clientSession = new MqttClientSession(_options, DispatchPublishPacket);
+                    clientSession = new MqttClientSession(connectPacket.ClientId, _options, DispatchPublishPacket);
                     _clientSessions[connectPacket.ClientId] = clientSession;
 
                     MqttTrace.Verbose(nameof(MqttClientSessionsManager), $"Created a new session for client '{connectPacket.ClientId}'.");
@@ -126,6 +129,9 @@ namespace MQTTnet.Core.Server
 
         private void DispatchPublishPacket(MqttClientSession senderClientSession, MqttPublishPacket publishPacket)
         {
+            var eventArgs = new MqttApplicationMessageReceivedEventArgs(senderClientSession.ClientId, publishPacket.ToApplicationMessage());
+            ApplicationMessageReceived?.Invoke(this, eventArgs);
+
             foreach (var clientSession in _clientSessions.Values.ToList())
             {
                 clientSession.EnqueuePublishPacket(senderClientSession, publishPacket);

MQTTnet.Core/Server/MqttServer.cs

@@ -21,6 +21,7 @@ namespace MQTTnet.Core.Server
             _adapters = adapters ?? throw new ArgumentNullException(nameof(adapters));
             
             _clientSessionsManager = new MqttClientSessionsManager(options);
+            _clientSessionsManager.ApplicationMessageReceived += (s, e) => ApplicationMessageReceived?.Invoke(s, e);
         }
 
         public IList<string> GetConnectedClients()
@@ -30,6 +31,8 @@ namespace MQTTnet.Core.Server
 
         public event EventHandler<MqttClientConnectedEventArgs> ClientConnected;
 
+        public event EventHandler<MqttApplicationMessageReceivedEventArgs> ApplicationMessageReceived;
+
         public void InjectClient(string identifier, IMqttCommunicationAdapter adapter)
         {
             if (adapter == null) throw new ArgumentNullException(nameof(adapter));

MQTTnet.nuspec

@@ -0,0 +1,63 @@
+<?xml version="1.0"?>
+<package >
+  <metadata>
+    <id>MQTTnet</id>
+    <version>2.1.4.0</version>
+    <authors>Christian Kratky</authors>
+    <owners>Christian Kratky</owners>
+    <licenseUrl>https://github.com/chkr1011/MQTTnet/blob/master/LICENSE</licenseUrl>
+    <projectUrl>https://github.com/chkr1011/MQTTnet</projectUrl>
+    <iconUrl>https://raw.githubusercontent.com/chkr1011/MQTTnet/master/Images/Logo_128x128.png</iconUrl>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <description>MQTTnet is a .NET library for MQTT based communication. It provides a MQTT client and a MQTT server (broker).</description>
+    <releaseNotes>* [.NET Standard] Added support for .NET Standard 1.3 (Thanks to 1iveowl)
+* [Server] Added an event to receive every application message</releaseNotes>
+    <copyright>Copyright Christian Kratky 2016-2017</copyright>
+    <tags>MQTT MQTTClient MQTTServer MQTTBroker Broker</tags> 
+    <dependencies>
+
+      <group targetFramework="netstandard1.3">
+        <dependency id="System.Net.Security" version="4.3.1" />
+      </group>
+
+    </dependencies>
+  </metadata>
+
+  <files>
+    <!-- Universal Windows -->
+    <file src=".\Frameworks\MQTTnet.UniversalWindows\bin\Release\MQTTnet.Core.dll" target="lib\uap10.0"/>
+    <file src=".\Frameworks\MQTTnet.UniversalWindows\bin\Release\MQTTnet.dll" target="lib\uap10.0"/>
+    <file src=".\Frameworks\MQTTnet.UniversalWindows\bin\Release\MQTTnet.pri" target="lib\uap10.0"/>
+
+    <file src=".\Frameworks\MQTTnet.UniversalWindows\bin\ARM\Release\MQTTnet.Core.dll" target="lib\uap10.0-arm"/>
+    <file src=".\Frameworks\MQTTnet.UniversalWindows\bin\ARM\Release\MQTTnet.dll" target="lib\uap10.0-arm"/>
+    <file src=".\Frameworks\MQTTnet.UniversalWindows\bin\ARM\Release\MQTTnet.pri" target="lib\uap10.0-arm"/>
+
+    <file src=".\Frameworks\MQTTnet.UniversalWindows\bin\x64\Release\MQTTnet.Core.dll" target="lib\uap10.0-x64"/>
+    <file src=".\Frameworks\MQTTnet.UniversalWindows\bin\x64\Release\MQTTnet.dll" target="lib\uap10.0-x64"/>
+    <file src=".\Frameworks\MQTTnet.UniversalWindows\bin\x64\Release\MQTTnet.pri" target="lib\uap10.0-x64"/>
+
+    <file src=".\Frameworks\MQTTnet.UniversalWindows\bin\x86\Release\MQTTnet.Core.dll" target="lib\uap10.0-x86"/>
+    <file src=".\Frameworks\MQTTnet.UniversalWindows\bin\x86\Release\MQTTnet.dll" target="lib\uap10.0-x86"/>
+    <file src=".\Frameworks\MQTTnet.UniversalWindows\bin\x86\Release\MQTTnet.pri" target="lib\uap10.0-x86"/>
+
+    <!-- .NET Framework -->
+    <file src=".\Frameworks\MQTTnet.NetFramework\bin\Release\MQTTnet.Core.dll" target="lib\net45"/>
+    <file src=".\Frameworks\MQTTnet.NetFramework\bin\Release\MQTTnet.dll" target="lib\net45"/>
+    
+    <file src=".\Frameworks\MQTTnet.NetFramework\bin\x86\Release\MQTTnet.Core.dll" target="lib\net45-x86"/>
+    <file src=".\Frameworks\MQTTnet.NetFramework\bin\x86\Release\MQTTnet.dll" target="lib\net45-x86"/>
+
+    <file src=".\Frameworks\MQTTnet.NetFramework\bin\x64\Release\MQTTnet.Core.dll" target="lib\net45-x64"/>
+    <file src=".\Frameworks\MQTTnet.NetFramework\bin\x64\Release\MQTTnet.dll" target="lib\net45-x64"/>
+
+    <!-- .NET Core App -->
+    <file src=".\Frameworks\MQTTnet.NetCoreApp\bin\Release\netcoreapp1.1\MQTTnet.Core.dll" target="lib\netcoreapp1.1"/>
+    <file src=".\Frameworks\MQTTnet.NetCoreApp\bin\Release\netcoreapp1.1\MQTTnet.dll" target="lib\netcoreapp1.1"/>
+
+    <!-- .NET Standard 1.3 -->
+    <file src=".\Frameworks\MQTTnet.Netstandard\bin\Release\netstandard1.3\MQTTnet.Core.dll" target="lib\netstandard1.3"/>
+    <file src=".\Frameworks\MQTTnet.Netstandard\bin\Release\netstandard1.3\MQTTnet.dll" target="lib\netstandard1.3"/>
+    
+  </files>
+</package>

MQTTnet.sln

@@ -17,8 +17,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MQTTnet.Core", "MQTTnet.Cor
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{002203AF-2565-4C0D-95ED-027FDEFE0C35}"
 	ProjectSection(SolutionItems) = preProject
-		Build\build.ps1 = Build\build.ps1
-		Build\MQTTnet.nuspec = Build\MQTTnet.nuspec
+		build.ps1 = build.ps1
+		MQTTnet.nuspec = MQTTnet.nuspec
 	EndProjectSection
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MQTTnet.TestApp.NetFramework", "Tests\MQTTnet.TestApp.NetFramework\MQTTnet.TestApp.NetFramework.csproj", "{D9D74F33-6943-49B2-B765-7BD589082098}"

build.ps1

@@ -11,4 +11,4 @@ $msbuild = "C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBui
 
 Remove-Item .\NuGet -Force -Recurse
 New-Item -ItemType Directory -Force -Path .\NuGet
-NuGet.exe pack MQTTnet.nuspec -Verbosity detailed -Symbols -OutputDir "NuGet" -Version $version
+.\NuGet.exe pack MQTTnet.nuspec -Verbosity detailed -Symbols -OutputDir "NuGet" -Version $version