import time
from socket import *
import struct

MYPORT = 10086
MYGROUP = '224.0.1.255'

def sender():
    s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)
    while True:
        data = 'cisco'
        s.sendto(data + '\0', (MYGROUP, MYPORT))
        print "send data ok !"
        time.sleep(3)

if __name__ == "__main__":
    sender()