Did you want to chat to be realtime or delayed, so someone can post messages that can be read in-game later?
If they were delayed we could roleplay a sort of Donitz commander player that could receive the messages and give commands to uboats, and the uboats would receive the messages once they relaunch their patrol after connecting to a server. This would require an external program to be made.
Or are you thinking of having in-game multiplayer chat between players?
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