Merge pull request #151 from quadbyte/com_hotfix

Com Fix for Sentry' s issues

Author: t3knomanzer

Desktop/Application/MaxMix/Services/Communication/CommunicationService.cs

@@ -255,10 +255,12 @@ private void Disconnect()
             }
             catch { }
         }
+        #endregion
 
-        private void Receive()
+        #region EventHandlers
+        private void OnDataReceived(object sender, SerialDataReceivedEventArgs args)
         {
-            while (_serialPort.BytesToRead > 0)
+            while ((_serialPort != null) && (_serialPort.BytesToRead > 0))
             {
                 byte received = (byte)_serialPort.ReadByte();
                 _buffer.Add(received);
@@ -299,14 +301,6 @@ private void Receive()
                 }
             }
         }
-
-        #endregion
-
-        #region EventHandlers
-        private void OnDataReceived(object sender, SerialDataReceivedEventArgs e)
-        {
-            Receive();
-        }
         #endregion
 
         #region Event Dispatchers

Desktop/Application/MaxMix/Services/Communication/Serial/CobsSerializationService .cs

@@ -207,9 +207,14 @@ public IMessage Deserialize(byte[] bytes)
             byte[] payload = decoded.Skip(2).Take(length - 3).ToArray();
 
             // Deserialize payload with message type instance
-            Type type = _registeredTypes[command];
             IMessage message;
-            if (type == typeof(MessageAcknowledgment))
+            Type type = _registeredTypes[command];
+            if (type == null)
+            {
+                // Message from an unregistered type, simply ignore it.
+                return null;
+            }
+            else if (type == typeof(MessageAcknowledgment))
             {
                 message = Activator.CreateInstance(type, revision) as MessageAcknowledgment;
             }