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//NOTE: not a working sample, code is for demonstration purposes only
 
class SampleMessageHandler
{
	//Setup Thread wait / Mutex
	EventWaitHandle ewh = new EventWaitHandler(false, EventResetMode.AutoReset);
	public delegate void IncomingMessageDelegate(Frame incomingFrame);

	Frame sentFrame;

	public void StartSending()
	{
		while(isMessageInQueue)
		{
	    	sentFrame = SendNextFrame();

	    	//Wait For Ack
	    	ewh.WaitOne();
		}
	}

	public void HandleIncomingFrame(Frame incomingFrame)
	{	
		if(incomingFrame.isAckOf(sentFrame))
		{
			ewh.set();//signal the wait	
		}
		else
		{
			doSomethingElse(incomingFrame);
		}

	}

	public class SerialListener
	{

		public static StartSerialListener()
		{
			IncomingMessageDelegate imd1 = new IncomingMessageDelegate(HandleIncomingFrame);
			openComPort();
			startReceiving();
		}

		//Listener methods
		//	.
		//	.
		//	.
		//	.

		public void onIncomingMessage(Frame f)
		{
			//
			//
			//
			imd1(f);
		}


	}

}

class Test()
{
	public static void Main()
	{
		SerialAckSmaple sas = new SerialAckSample();
		sas.StartSerialListener();
		sas.StartSending();
	}

}