There is no source program in the field, how to check the code sent by the network controlled device

ttt

There is no source program in the field, how to check the code sent by the network controlled device?
The scene does not know what brand of video matrix, the central control host is through the network control video matrix.
The client has no protocol document, nothing related to the information, only know the IP of the video matrix, the network port number does not know.
Only know that the device is a network controlled device, then in this case, how do we know whether the controlled device is tcp or udp? Which port number is connected to the central control device? Then how can I know the content of the command sent by the central control to the video matrix?
Is there any way to do that?

Marc Scheibein

What kind of brand and model btw, can't imagine that there is really no information about that matrix...

Without knowing anything more than the IP of the unit, the only chance may be to use WireShark, let it run to capture packets, and then filter for source IP (the controller) and/or destination IP (the unit), to find the IP protocol type, and packet content.

But without any information about the control protocol itself, it may be hard or even impossible to re-engineer the protocol, if it is not an ascii based one.