#!/usr/bin/env python

# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

from __future__ import print_function

from twisted.internet.protocol import DatagramProtocol
from twisted.internet import reactor

class EchoClientDatagramProtocol(DatagramProtocol):
    strings = [
        b"Hello, world!",
        b"What a fine day it is.",
        b"Bye-bye!"
    ]
    
    def startProtocol(self):
        self.transport.connect('127.0.0.1', 8000)
        self.sendDatagram()
    
    def sendDatagram(self):
        if len(self.strings):
            datagram = self.strings.pop(0)
            self.transport.write(datagram)
        else:
            reactor.stop()

    def datagramReceived(self, datagram, host):
        print('Datagram received: ', repr(datagram))
        self.sendDatagram()

def main():
    protocol = EchoClientDatagramProtocol()
    t = reactor.listenUDP(0, protocol)
    reactor.run()

if __name__ == '__main__':
    main()