Support protocol version 3.4

Describe the bug I tried the example script from the read me. Tuyapi is able to find the device and to connect, but directly disconnects afterwards. It’s not possible to keep the connection and listen to data.

Also tried it in Node-Red with package node-red-contrib-tuya-smart-device which uses latest tuyapi. Same error, it constantly reconnects. But at least it receives some data events which results in error logs with messages like Error: CRC mismatch: expected -674619356, was -22843090

Maybe the problem is the protocol version 3.4? Didn’t find any information if tuyapi supports 3.4.

debug output:

node test.js
  TuyAPI Finding missing IP undefined or ID bf97ae127518bd821b1mdo +0ms
  TuyAPI Received UDP message. +4s
  TuyAPI UDP data: +1ms
  TuyAPI {
  TuyAPI   payload: {
  TuyAPI     ip: '192.168.0.42',
  TuyAPI     gwId: 'bf97ae127518bd821b1mdo',
  TuyAPI     active: 2,
  TuyAPI     ablilty: 0,
  TuyAPI     encrypt: true,
  TuyAPI     productKey: 'keyyj3fy8x98arty',
  TuyAPI     version: '3.4',
  TuyAPI     token: true
  TuyAPI   },
  TuyAPI   leftover: false,
  TuyAPI   commandByte: 35,
  TuyAPI   sequenceN: 0
  TuyAPI } +1ms
  TuyAPI Connecting to 192.168.0.42... +5ms
  TuyAPI Socket connected. +7ms
Connected to device!
  TuyAPI GET Payload: +2ms
  TuyAPI {
  TuyAPI   gwId: 'bf97ae127518bd821b1mdo',
  TuyAPI   devId: 'bf97ae127518bd821b1mdo',
  TuyAPI   t: '1623446698',
  TuyAPI   dpId: [ 18, 19, 20 ],
  TuyAPI   uid: 'bf97ae127518bd821b1mdo'
  TuyAPI } +0ms
  TuyAPI GET Payload: +3ms
  TuyAPI {
  TuyAPI   gwId: 'bf97ae127518bd821b1mdo',
  TuyAPI   devId: 'bf97ae127518bd821b1mdo',
  TuyAPI   t: '1623446698',
  TuyAPI   dps: {},
  TuyAPI   uid: 'bf97ae127518bd821b1mdo'
  TuyAPI } +0ms
  TuyAPI Socket closed: 192.168.0.42 +13ms
  TuyAPI Disconnect +1ms
Disconnected from device.

[harryzz]

Hello I made some changes for support 3.4 version and pushed code in my repository @github. If someone interested and have time can review and clean code and make PR here. Tested about 2 month with tuya-mqtt(patched to support zigbee gateways). Tested devices: sensors, switches, dimmers, valves.

regards, Zahari

[harryzz]

If someone interested I will send linux binary (tyZ3Gw: ELF 32-bit MSB executable, MIPS, MIPS-I version 1 (SYSV), dynamically linked, interpreter /lib/ld-uClibc.so.0). Seems the protocol for crypt/decrypt messages are the same AES/ECB/NoPadding. May be localKey is modified to be used for crypt/decrypt. There are also token send in registration process encrypted with md5(constant) - like broadcast message.

regards, Zahari