davidferguson

## Background

The Xiaomi Mi 2 temperature sensors are very cheap (less than £5 with battery included) temperature sensors that are designed to work with the Xiaomi Home IoT system. However, clever people have written custom firmware allowing them to be used outside of this, on Bluetooth BLE or Zigbee.

However starting in mid 2025, a new firmware was flashed by default on the Mi 2 sensors that means that in order to flash the custom firmware, you first have to obtain the device ID, token and key. You can do this by connecting it to Xiaomi Home, using a tool to extract the keys, and then not using Xiaomi Home again.


## Checking if you have firmware 2.1.1_0159

1. Go to https://pvvx.github.io/ATC_MiThermometer/TelinkMiFlasher.html in Chrome

davidferguson

var websocket

function doConnect()
{
  websocket = new WebSocket('ws://localhost:8000/')
  websocket.onopen = function(evt) { onOpen(evt) }
  websocket.onclose = function(evt) { onClose(evt) }
  websocket.onmessage = function(evt) { onMessage(evt) }
  websocket.onerror = function(evt) { onError(evt) }
}

davidferguson

from bottle import *
app = Bottle()

@app.hook('after_request')
def enable_cors():
    print("after_request hook")
    response.headers['Access-Control-Allow-Origin'] = '*'
    response.headers['Access-Control-Allow-Methods'] = 'GET, POST, PUT, OPTIONS'
    response.headers['Access-Control-Allow-Headers'] = 'Origin, Accept, Content-Type, X-Requested-With, X-CSRF-Token'

davidferguson

<xml id="toolbox" style="display: none">
    <category name="{catLogic}" colour="210">
      <block type="controls_if"></block>
      <block type="logic_compare"></block>
      <block type="logic_operation"></block>
      <block type="logic_negate"></block>
      <block type="logic_boolean"></block>
      <block type="logic_null"></block>
      <block type="logic_ternary"></block>
    </category>