Merge pull request #422 from ifit/client-cancel-task

Client cancel task

Source/MQTTnet/Client/MqttClient.cs

@@ -183,10 +183,12 @@ namespace MQTTnet.Client
 
         public void Dispose()
         {
+            _cancellationTokenSource?.Cancel (false);
             _cancellationTokenSource?.Dispose();
             _cancellationTokenSource = null;
 
             _adapter?.Dispose();
+            _adapter = null;
         }
 
         private async Task<MqttConnAckPacket> AuthenticateAsync(MqttApplicationMessage willApplicationMessage, CancellationToken cancellationToken)
@@ -245,10 +247,7 @@ namespace MQTTnet.Client
             }
             finally
             {
-                _adapter?.Dispose();
-                _adapter = null;
-                _cancellationTokenSource?.Dispose();
-                _cancellationTokenSource = null;
+                Dispose ();
                 _cleanDisconnectInitiated = false;
 
                 _logger.Info("Disconnected.");
@@ -394,6 +393,7 @@ namespace MQTTnet.Client
 
                 if (exception is OperationCanceledException)
                 {
+                    _logger.Verbose ("MQTT OperationCanceled exception while receiving packets.");
                 }
                 else if (exception is MqttCommunicationException)
                 {

Source/MQTTnet/Server/MqttClientSession.cs

@@ -138,7 +138,9 @@ namespace MQTTnet.Server
 
                 _cleanupHandle?.Dispose();
                 _cleanupHandle = null;
-
+                
+                _adapter = null;
+                _cancellationTokenSource?.Cancel(false);
                 _cancellationTokenSource?.Dispose();
                 _cancellationTokenSource = null;
             }
@@ -290,7 +292,9 @@ namespace MQTTnet.Server
         {
             _pendingPacketsQueue?.Dispose();
 
+            _cancellationTokenSource?.Cancel ();
             _cancellationTokenSource?.Dispose();
+            _cancellationTokenSource = null;
         }
 
         private void ProcessReceivedPacket(IMqttChannelAdapter adapter, MqttBasePacket packet, CancellationToken cancellationToken)