lifxdiscovery.py

import socket
from bitstruct import pack, byteswap, calcsize
from binascii import hexlify

frame_header_format = 'u16u2u1u1u12u32'
frame_header_byteswap = '224'

frame_address_format = 'u64u48u6u1u1u8'
frame_address_byteswap = '8611'

protocol_header_format = 'u64u16u16'
protocol_header_byteswap = '822'

def send_packet(packet):
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
    sock.sendto(packet, ("192.168.1.255", 56700))

def sizeof(format):
    return int(calcsize(format) / 8)

def make_frame_header(size, tagged, source):
    unswapped_header = pack(frame_header_format, size, 0, tagged, 1, 1024, source)
    return byteswap(frame_header_byteswap, unswapped_header)

def make_frame_address(target, ack_required, res_required, sequence):
    unswapped_header = pack(frame_address_format, target, 0, 0, ack_required, res_required, sequence)
    return byteswap(frame_address_byteswap, unswapped_header)

def make_protocol_header(message_type):
    unswapped_header = pack(protocol_header_format, 0, message_type, 0)
    return byteswap(protocol_header_byteswap, unswapped_header)

def send_discovery():
    packet_size = sizeof(frame_header_format + frame_address_format + protocol_header_format)
    # CREATE THE HEADERS
    frame_header = make_frame_header(packet_size, 1, 25061990)
    frame_address = make_frame_address(0, 0, 1, 0)
    protocol_header = make_protocol_header(2)
    header = frame_header + frame_address + protocol_header

    packet = header
    send_packet(packet)