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So, you're saying I need a client for each thread? So I'll need a list of clients with their indexes synchronised with the command message list? Or a single client that never closes the connection?

I wasn't sure which client I needed to close, so I did both. I'm guessing it should only be "u.Close()"? My code flow should be: Add commands to buffer Start threads Send thread command Wait for response (for 5 secs) Print response - or if no response, remove command from buffer Allow next...

Thanks for you reply. I've changed the receive process to Private Sub ReceiveCallback(ByVal ar As IAsyncResult) Dim u As UdpClient = CType((CType(ar.AsyncState, Cls_UDPState)).UDPClient, UdpClient) Dim e As IPEndPoint = CType((CType(ar.AsyncState, Cls_UDPState)).EndPoint, IPEndPoint)...

I still have an issue with this, and haven't got any further. I have tried to increase the RxUDP.Client.Buffersize, and I'm only sending one message at a time so can't see it being the queue is full.

I think COM Port name strings are a fixed length. The best way I've got COM port names is by using My.Computer.Ports.SerialPortNames. Add these to a list and use this to get the port you want to use. For Each COMString As String In My.Computer.Ports.SerialPortNames...

I'm trying to write a UDP application that sends a message and waits for a response before sending another. To do this I am using a Semaphore initialising with the total threads, up to 6, and a count of 1. In the Semaphore thread, I have a loop that runs as long as the semaphore is not complete...

Not sure if this is the right Forum to post this. I am developing an application to handle communication with a number of hardware devices using a Serial RS232 ComPort, but this would involve using numerous adapters. Is there a way to create a ComPort without the need for hardware in vb.net?