Find outgoing port

[Hest]

I have made a little piece of software, that sends a string to a train controller. The controller sends back a confirmation and here the problems are beginning.

I have used a packet logger and found out, that my program sendts the string to the correct port, but the outgoing port from the PC is random. The response from the train controller goes back to that random port.

Is it possible to choose what port should be used as outgoing, so that I can listen for a response on the correct port?

I have added a picture as example. PC has ip x.x.x.2, train controller has x.x.x.3 and receives on port 15471

My program sends the string from port 51277 to 15471 and the controller sends back from 15471 to 51277, but because 51277 is random, my program don't know what port to listen on..

Any help is very appreciated

Edited July 25, 2008 by Hest

[ProgAndy]

You don't need to know the port. the connection established by

$Connection = TCPConnect(...,...) is bidirectional.

To send, use TCPSend($Connection,...)

And receive with $data = TCPRecv($Connection,2048)

[Hest]

Edit: Working now, I made a mistake. Sadly I don't remember exactly what it was.

Edited July 25, 2008 by Hest