bjnp_discover.py

# Script for emulating the Canon BJNP discover request
# License: CC0

import socket
import time
import itertools
import time
import select
from datetime import datetime

ip = "192.168.217.255"
port = 8611
wait = 3

payload = b"BJNP\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
sock.setblocking(False)
sock.bind(("0.0.0.0", 0))
for counter in itertools.count(1):
    sock.sendto(payload, (ip, port))
    sent_time = datetime.now()
    print(sent_time.strftime("%H:%M:%S"), "Sent packet", counter)

    selr, selw, selx = select.select([sock], [], [], wait)
    if not selr:
        print("Timed out")
        continue

    diff = 0
    while True:
        try:
            data, addr = sock.recvfrom(1024)
        except socket.error:
            break

        resp_time = datetime.now()
        diff = (resp_time - sent_time).total_seconds()
        print(resp_time.strftime("%H:%M:%S"), "Response from",
            addr[0], "after {:.1f}ms".format(diff * 1000))

    time.sleep(wait - diff)