enable abort exceptions

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

@@ -131,14 +131,14 @@ namespace MQTTnet.AspNetCore.Client.Tcp
                 if (!_aborted)
                 {
                     // Calling Dispose after ReceiveAsync can cause an "InvalidArgument" error on *nix.
-                    //error = new MqttCommunicationException();
+                    error = ConnectionAborted();
                 }
             }
             catch (ObjectDisposedException)
             {
                 if (!_aborted)
                 {
-                    //error = new MqttCommunicationException();
+                    error = ConnectionAborted();
                 }
             }
             catch (IOException ex)
@@ -153,7 +153,7 @@ namespace MQTTnet.AspNetCore.Client.Tcp
             {
                 if (_aborted)
                 {
-                    //error = error ?? new MqttCommunicationException();
+                    error = error ?? ConnectionAborted();
                 }
 
                 _application.Output.Complete(error);
@@ -193,6 +193,11 @@ namespace MQTTnet.AspNetCore.Client.Tcp
             }
         }
 
+        private Exception ConnectionAborted()
+        {
+            return new MqttCommunicationException("Connection Aborted");
+        }
+
         private async Task<Exception> DoSend()
         {
             Exception error = null;