Listen to multicast messages

gistfile1.py

#!/usr/bin/python

import socket
import struct

grp = 'xxx.xxx.xx.xx'
port = 7001

sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind(('', port))

mreq = struct.pack("4sl", socket.inet_aton(grp), socket.INADDR_ANY)

sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)

while True:
    print sock.recv(10240)