[Question] Does anyone know of a videostreaming protocol with following behaviour?

Hi! I have a drone, which i would like to control from pc. It can be controlled by app, so it should be possible. If I connect via tcp, the drone sends a message of 20 bytes and if the app doesn't answer with the correct 12 bytes, the drone closes the connection. Has anyone here seen something like this before? Sorry, if this is not appropriate on this sub...

The 20 bytes are somewhat organized, with a counter and something like a pattern, the 12 bytes are completely random, the reverse engeneered code uses arc4random() functions.

Thanks in advance!