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For people stumbling on this topic with the same question in the future, here is the awnser:

The COMM_TYPE indicates what the sender of the message expects as an awnser. Each value corresponds with a possible reply.

I have not been able to find what values exactly indicate what. But just for the sake of giving an example: 0 could indicate that the sender expects nothing back, 1 could indicate the sender expects a 'message received' message back, 2 could indicate the sender expects some kind of bigger reply with a value or other information. *Again: these values are not accurate, it's just an example!*