ref: 1ae5f49da652bd01227e6ed5b22dbcedac6d8b36
dir: /sys/src/cmd/python/Demo/sockets/radio.py/
# Receive UDP packets transmitted by a broadcasting service
MYPORT = 50000
import sys
from socket import *
s = socket(AF_INET, SOCK_DGRAM)
s.bind(('', MYPORT))
while 1:
    data, wherefrom = s.recvfrom(1500, 0)
    sys.stderr.write(repr(wherefrom) + '\n')
    sys.stdout.write(data)