dumb_server.py

import socket
import struct


class Player:

    def __init__(self, id, peer):
        self.id = id
        self.peer = peer
        self.position = (0, 0, 0)


class Server:

    def __init__(self, address, port):
        self.address = address
        self.port = port
        self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        # self.socket.setblocking(False)
        self.socket.bind((address, port))
        self.players = {}

    def tick(self):
        try:
            packet, sender = self.socket.recvfrom(16)
        except:
            return
        player_id, x, y, z = struct.unpack('<I3f', packet)
        if player_id not in self.players:
            print('new player discovered with id {} peer {}'.format(
                player_id, sender))
            self.players[player_id] = Player(player_id, sender)
        player = self.players[player_id]
        player.peer = sender
        player.position = (x, y, z)
        packet = struct.pack('<I3f', player.id, *player.position)
        for player in self.players.values():
            self.socket.sendto(packet, player.peer)

    def run(self):
        while True:
            self.tick()


Server('0.0.0.0', 5000).run()