#!/usr/bin/env python
#encoding=utf-8

from ctypes import *

class TPkt(BigEndianStructure):
    pass
TPkt._pack_ = 1
TPkt._fields_=[
                ('len',     c_uint, 12),
                ('rsv1',    c_uint, 2),
                ('type',    c_uint, 2),
                ('rsv2',    c_uint16),
                ('data',    c_uint8 * 2040),
                ]

class TSubPkt(BigEndianStructure):
    pass

TSubPkt._pack_ = 1
TSubPkt._fields_=[
                ('dev',  c_uint, 14),
                ('mode', c_uint, 2),
                ('addr', c_uint16),
                ('cmd',  c_uint, 4),
                ('slen', c_uint, 12),
                ('wkr',  c_uint16)
                ]




if __name__ == '__main__':
    packet = b'\0' * 2048

    pkt = cast (packet, POINTER(TPkt)).contents
    pkt.len = 512
    pkt.rsv1 = 0
    pkt.type = 0
    pkt.rsv2 = 0
    pkt.data[0] = 1
    pkt.data[1] = 2
    pkt.data[2] = 3
    pkt.data[3] = 4

    for i in range(10):
        print(hex(packet[i]), ' ')