Simple UDP receive/send pair for IPv6 with the receive side using asyncio

udpreceive.py

import asyncio
import socket

class CustomProto(asyncio.DatagramProtocol):
    def connection_made(self, transport):
        print('ready to receive datagrams on', transport.get_extra_info('sockname'))

    def error_received(self, exc):
        print('Error:', exc)

    def datagram_received(self, data, addr):
        print('Datagram received:', data)


loop = asyncio.get_event_loop()
loop.set_debug(True)
transport, protocol = loop.run_until_complete(loop.create_datagram_endpoint(CustomProto, local_addr=('::1', 9999)))
loop.run_forever()

udpsend.py

import socket

remote_addr = ('::1', 9999)
with socket.socket(socket.AF_INET6, socket.SOCK_DGRAM) as udp:
    udp.sendto(b'test message', remote_addr)
    print('Sent a message to', remote_addr)