Testing UDP broadcast and asyncio

udpbroadcast.py

import asyncio


class EchoProtocol:
    
    def connection_made(self, transport):
        self.transport = transport

    def datagram_received(self, data, addr):
        message = data.decode()
        print("Echoing {0!r} from/to {1[0]}:{1[1]}".format(message, addr))
        self.transport.sendto(data, addr)


class ClientProtocol:

    def connection_made(self, transport):
        self.transport = transport

    def datagram_received(self, data, addr):
        message = data.decode()
        print("Received {0!r} from {1[0]}:{1[1]}".format(message, addr))

    def send(self, message):
        data = message.encode()
        addr = self.transport._address
        print("Sending {0!r} to {1[0]}:{1[1]}".format(message, addr))
        self.transport.sendto(data)


async def main(addr=('194.47.253.255', 8000)):
    message = "Hello World!"
    loop = asyncio.get_event_loop()
    _, _ = await loop.create_datagram_endpoint(
        EchoProtocol, local_addr=addr)
    _, client = await loop.create_datagram_endpoint(
        ClientProtocol, remote_addr=addr, allow_broadcast=True)
    while True:
        client.send('Hello!')
        await asyncio.sleep(3)


if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    loop.run_until_complete(main())
    loop.close()