Listen for and print out the contents of UDP packets received on a specific port.

listenudp.py

import socket
import argparse


if __name__ == "__main__":
    p = argparse.ArgumentParser()
    p.add_argument("port", type=int)
    args = p.parse_args()

    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    sock.bind(("0.0.0.0", args.port))

    while True:
        data, addr = sock.recvfrom(1024)
        print "Packet received from %s: %s" % (addr, data)