Created
October 11, 2018 13:39
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Join a multicast group in python and receive data
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| #!/usr/bin/env python3 | |
| import socket | |
| import sys | |
| def main(argv): | |
| multicast_group = argv[1] | |
| multicast_port = int(argv[2]) | |
| interface_ip = argv[3] | |
| sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP) | |
| sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 32) | |
| sock.bind(('', multicast_port)) | |
| sock.setsockopt(socket.SOL_IP, socket.IP_ADD_MEMBERSHIP, | |
| socket.inet_aton(multicast_group) + socket.inet_aton(interface_ip)) | |
| while True: | |
| received = sock.recv(1500) | |
| print('Received packet of {0} bytes'.format(len(received))) | |
| if __name__ == '__main__': | |
| if len(sys.argv) != 4: | |
| print("Usage: {0} <group address> <port> <interface ip>".format(sys.argv[0])) | |
| sys.exit(1) | |
| main(sys.argv) |
The interface IP is the address of your local interface.
0.0.0.0 may work but this may be system dependent. Using 0.0.0.0 while having a route to 224.0.0.0/4 may work too.
oh cheers, brilliant!
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very neat! can I just ask, what is the interface ip and how does it differ from the multicast group argument? thanks!