import socket
import sys


s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

if len(sys.argv) > 1:

    ## Server Mode

    s.bind(("0.0.0.0", 10000))
    while 1:
        data = s.recv(1024)
        if not data: break
        print "received packet"
else:

    ## Client Mode

    s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
    s.bind(("127.0.0.2", 10000))
    s.sendto('Hello, world', ("255.255.255.255", 10000))