serverudp.py

import asyncio
import random

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

        def datagram_received(self, data, addr):
        message = data.decode()
        print('Received %r from %s' % (message, addr))
        rand = random.randint(0, 5)
        if rand >= 4:
            print('Send %r to %s' % (message, addr))
            self.transport.sendto(data, addr)
                else:
            print('Send %r to %s' % (message, addr))
            self.transport.sendto(data, addr)

loop = asyncio.get_event_loop()
print("Starting UDP server")

# One protocol instance will be created to serve all client requests
listen = loop.create_datagram_endpoint(
    EchoServerProtocol, local_addr=('192.168.43.215', 12000))
transport, protocol = loop.run_until_complete(listen)

try:
    loop.run_forever()
except KeyboardInterrupt:
    pass

transport.close()
loop.close()