Protocol is very easy - asynchronous, persistent connection on TCP/IP similar to JSON-RPC
{"action": "set_speed", "speed": 2}\n
{"status": "OK", "speed": 2}\n
Because this game is real time, server sends data about moving of tanks/bullets etc
TODO: write about frequency and usage of informations
{"status": "data", "action": "change", "id": "HEX", …}\n