ref: cd711ec1346a827a8115f5bda7b5da57f9e7c181
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)