#!/usr/bin/python
import sys
import socket

if (len(sys.argv) < 2):
    print "Script requires 1 argument: port_number"
    sys.exit(1)

portNum = int(sys.argv[1])
mySocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
mySocket.bind(('',portNum))
while 1:
    data, fromAddress = mySocket.recvfrom(65536)
    print "received '" + data + "' from", fromAddress
    print "sending reply"
    mySocket.sendto("reply", fromAddress)