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Data in a TCP stream is unreadable. How does one figure out what the data holds? I have access to both the Server and Client versions of the software.

I am currently hosting a game server on an old online game framework called Byond. I wanted to investigate the data being sent back and forth from the client/server. I would be surprised if this data was encrypted as the code is very old and designed for old network connections like a 56k dial-up. I suspect the data is compressed for this reason. I'd like to attach a sample of my packet capture but I don't see the option. Below are two separate TCP data payloads. I am curious how professionals in the field figure out how to read data in a TCP stream when they do not know how it was compressed/encoded/encrypted.