First of all, it's not what I wrote, it's what I found, but the others wrote it pretty well.
Copy Code code as follows:
# 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) # 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
Copy Code code as follows:
#!/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 ()
