Refactor thread management.

Build/MQTTnet.nuspec

@@ -27,7 +27,7 @@
         <dependency id="NETStandard.Library" version="2.0.0" />
         <dependency id="System.Net.Security" version="4.3.2" />
         <dependency id="System.Net.WebSockets" version="4.3.0" />
-        <dependency id="System.Net.WebSockets.Client" version="4.3.1" />
+        <dependency id="System.Net.WebSockets.Client" version="4.3.2" />
       </group>
       <group targetFramework="uap10.0">
         <dependency id="Microsoft.NETCore.UniversalWindowsPlatform" version="5.4.1" />

Frameworks/MQTTnet.NetStandard/Client/MqttClient.cs

@@ -507,12 +507,20 @@ namespace MQTTnet.Client
 
         private void StartReceivingPackets(CancellationToken cancellationToken)
         {
-            _packetReceiverTask = Task.Run(() => ReceivePacketsAsync(cancellationToken), cancellationToken);
+            _packetReceiverTask = Task.Factory.StartNew(
+                () => ReceivePacketsAsync(cancellationToken), 
+                cancellationToken,
+                TaskCreationOptions.LongRunning,
+                TaskScheduler.Current);
         }
 
         private void StartSendingKeepAliveMessages(CancellationToken cancellationToken)
         {
-            _keepAliveMessageSenderTask = Task.Run(() => SendKeepAliveMessagesAsync(cancellationToken), cancellationToken);
+            _keepAliveMessageSenderTask = Task.Factory.StartNew(
+                () => SendKeepAliveMessagesAsync(cancellationToken),
+                cancellationToken, 
+                TaskCreationOptions.LongRunning,
+                TaskScheduler.Current);
         }
 
         private void StartProcessReceivedPacketAsync(MqttBasePacket packet, CancellationToken cancellationToken)

Frameworks/MQTTnet.NetStandard/Implementations/MqttTcpServerAdapter.cs

@@ -43,7 +43,11 @@ namespace MQTTnet.Implementations
                 _defaultEndpointSocket.Bind(new IPEndPoint(options.DefaultEndpointOptions.BoundIPAddress, options.GetDefaultEndpointPort()));
                 _defaultEndpointSocket.Listen(options.ConnectionBacklog);
 
-                Task.Run(() => AcceptDefaultEndpointConnectionsAsync(_cancellationTokenSource.Token), _cancellationTokenSource.Token);
+                Task.Factory.StartNew(
+                    () => AcceptDefaultEndpointConnectionsAsync(_cancellationTokenSource.Token),
+                    _cancellationTokenSource.Token, 
+                    TaskCreationOptions.LongRunning,
+                    TaskScheduler.Current);
             }
 
             if (options.TlsEndpointOptions.IsEnabled)
@@ -63,7 +67,11 @@ namespace MQTTnet.Implementations
                 _tlsEndpointSocket.Bind(new IPEndPoint(options.TlsEndpointOptions.BoundIPAddress, options.GetTlsEndpointPort()));
                 _tlsEndpointSocket.Listen(options.ConnectionBacklog);
 
-                Task.Run(() => AcceptTlsEndpointConnectionsAsync(_cancellationTokenSource.Token), _cancellationTokenSource.Token);
+                Task.Factory.StartNew(
+                    () => AcceptTlsEndpointConnectionsAsync(_cancellationTokenSource.Token), 
+                    _cancellationTokenSource.Token,
+                    TaskCreationOptions.LongRunning,
+                    TaskScheduler.Current);
             }
 
             return Task.FromResult(0);

Frameworks/MQTTnet.NetStandard/MQTTnet.Netstandard.csproj

@@ -6,7 +6,6 @@
     <AssemblyName>MQTTnet</AssemblyName>
     <RootNamespace>MQTTnet</RootNamespace>
     <GeneratePackageOnBuild>False</GeneratePackageOnBuild>
-    <DebugType>Full</DebugType>
     <AssemblyVersion>0.0.0.0</AssemblyVersion>
     <FileVersion>0.0.0.0</FileVersion>
     <Version>0.0.0.0</Version>
@@ -19,7 +18,7 @@
     <DelaySign>false</DelaySign>
   </PropertyGroup>
 
-  <PropertyGroup Condition="'$(TargetFramework)' == 'uap10.0'">
+  <PropertyGroup Condition="'$(TargetFramework)'=='uap10.0'">
     <CopyLocalLockFileAssemblies>false</CopyLocalLockFileAssemblies>
     <NugetTargetMoniker>UAP,Version=v10.0</NugetTargetMoniker>
     <TargetPlatformIdentifier>UAP</TargetPlatformIdentifier>
@@ -32,6 +31,10 @@
     <LanguageTargets>$(MSBuildExtensionsPath)\Microsoft\WindowsXaml\v$(VisualStudioVersion)\Microsoft.Windows.UI.Xaml.CSharp.targets</LanguageTargets>
   </PropertyGroup>
 
+  <PropertyGroup Condition="'$(Configuration)'=='Debug'">
+    <DebugType>Full</DebugType>
+  </PropertyGroup>
+  
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x86'" />
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" />
@@ -43,17 +46,17 @@
   <ItemGroup Condition="'$(TargetFramework)'=='netstandard2.0'">
     <PackageReference Include="System.Net.Security" Version="4.3.2" />
     <PackageReference Include="System.Net.WebSockets" Version="4.3.0" />
-    <PackageReference Include="System.Net.WebSockets.Client" Version="4.3.1" />
+    <PackageReference Include="System.Net.WebSockets.Client" Version="4.3.2" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)'=='netstandard1.3'">
     <PackageReference Include="System.Net.Security" Version="4.3.2" />
     <PackageReference Include="System.Net.WebSockets" Version="4.3.0" />
-    <PackageReference Include="System.Net.WebSockets.Client" Version="4.3.1" />
+    <PackageReference Include="System.Net.WebSockets.Client" Version="4.3.2" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)'=='uap10.0'">
-    <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform" Version="5.4.1" />
+    <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform" Version="6.0.8" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)'=='net452'">

Tests/MQTTnet.TestApp.AspNetCore2/MQTTnet.TestApp.AspNetCore2.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>netcoreapp2.0</TargetFramework>
-    <TypeScriptToolsVersion>2.3</TypeScriptToolsVersion>
+    <TypeScriptToolsVersion>Latest</TypeScriptToolsVersion>
   </PropertyGroup>
 
   <ItemGroup>