# UDP multicast examples, Hugo Vincent, 2005-05-14. import socket def send(data, port=50000, addr='239.192.1.100'): """send(data[, port[, addr]]) - multicasts a UDP datagram.""" # Create the socket s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # Make the socket multicast-aware, and set TTL. s.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 20) # Change TTL (=20) to suit # Send the data s.sendto(data, (addr, port)) def recv(port=50000, addr="239.192.1.100", buf_size=1024): """recv([port[, addr[,buf_size]]]) - waits for a datagram and returns the data.""" # Create the socket s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # Set some options to make it multicast-friendly s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) try: s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1) except AttributeError: pass # Some systems don't support SO_REUSEPORT s.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_TTL, 20) s.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_LOOP, 1) # Bind to the port s.bind(('', port)) # Set some more multicast options intf = socket.gethostbyname(socket.gethostname()) s.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_IF, socket.inet_aton(intf) + socket.inet_aton('0.0.0.0')) s.setsockopt(socket.SOL_IP, socket.IP_ADD_MEMBERSHIP, socket.inet_aton(addr) + socket.inet_aton('0.0.0.0')) # Receive the data, then unregister multicast receive membership, then close the port data, sender_addr = s.recvfrom(buf_size) s.setsockopt(socket.SOL_IP, socket.IP_DROP_MEMBERSHIP, socket.inet_aton(addr) + socket.inet_aton('0.0.0.0')) s.close() return data

#!/usr/bin/env python from socket import *from time import sleep,time,ctime HOST = '229.0.0.15'PORT = 9999BUFSIZ = 1024ADDR = (HOST, PORT) udpCliSock = socket(AF_INET, SOCK_DGRAM) data = 't'*200count = 0while(count<100 ): udpCliSock.sendto(data, ADDR) sleep(1) count = count+1 udpCliSock.close()