Listen broadcast udp packet.

listen_broadcast.py

from socket import *
import sys

if len(sys.argv) != 2:
    print("Please give me port number.")
else:
    try:
        port=int(sys.argv[1])
    except ValueError:
        print('Invalid port number.')
        sys.exit(1)
    try:
        s = socket(AF_INET, SOCK_DGRAM)
        s.bind(('', port))
        while True:
            data, address = s.recvfrom(1024)
            print((data.decode('utf-8').rstrip()))
    except Exception as e:
        s.close()
        print(e.args)