Please have a look at the warnings in the comments:
4 points
But why do you need a server for such a program? Can’t it be P2P or with the server stuff running on the client machine?
10 points
6 points
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Theoretically, without the server, every time you want to connect to a peer you would have to figure out what’s their public IP address is, which can change. The server acts as a middleman between the peers so you dont have to do this manually, all peers only need to know the server’s IP address to connect to each other. The server is really only used for this initial linking up of peers, afterwards the connection is P2P (if possible, they fall back to a relay server if P2P fails).
1 point
