get device token is 000000000000000000

[tustman]

device : Xiaomi Chuangmi Plug V3 (1 Socket, 2 USB Ports)
device ip : 172.28.1.15

code:

#-*-coding:utf8-*-
import codecs
import socket
from protocol import Message
helobytes=bytes.fromhex('21310020ffffffffffffffffffffffffffffffffffffffffffffffffffffffff')
s=socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
s.sendto(helobytes,('172.28.1.15',54321)) #插座ip，端口54321
data,addr=s.recvfrom(1024)
m=Message.parse(data)
tok=codecs.encode(m.checksum,'hex')
print(m)
print(tok)

result:

Container: 
    data = Container: 
        length = 0
        value = b'' (total 0)
        offset2 = 32
        offset1 = 32
        data = b'' (total 0)
    header = Container: 
        length = 16
        value = Container: 
            length = 32
            unknown = 0
            device_id = b'\x04H~\xe4' (total 4)
            ts = 1970-01-01 00:34:04
        offset2 = 16
        offset1 = 0
        data = b'!1\x00 \x00\x00\x00\x00\x04H~\xe4\x00\x00\x07\xfc' (total 16)
    checksum = b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' (total 16)
b'00000000000000000000000000000000'

[rytilahti]

This means that the device has already been bound to the app and/or does not reveal the token. You will have to find the token through other means, e.g., by extracting it from the backups.