ref: ad7a3f7f33448e5e1d808c8747916c20da51cd2f
dir: /sys/src/cmd/python/Demo/sockets/unicast.py/
# Send UDP broadcast packets
MYPORT = 50000
import sys, time
from socket import *
s = socket(AF_INET, SOCK_DGRAM)
s.bind(('', 0))
while 1:
    data = repr(time.time()) + '\n'
    s.sendto(data, ('', MYPORT))
    time.sleep(2)