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amazfit-neo-python

Turn on bluetooth

$ bluetoothctl

[bluetooth] power on

Installing dependencies

$ python3 -m venv env

$ source env/bin/activate

$ pip install -r requirements.txt

Setting MAC address and auth key

set MAC and KEY in .env file according to example in .env.example

KEY=0xa12345b67890cd1e2fg3hi45j6789012
MAC=AA:AA:AA:AA:AA:AA

Running

python3 main.py

Services, Characteristics, Descriptors

Huami

Huami Service - 0000fee0-0000-1000-8000-00805f9b34fb Battery Char. - 00000006-0000-3512-2118-0009af100700

Huami Auth

Auth Service - 0000fee1-0000-1000-8000-00805f9b34fb Auth Char. - 00000009-0000-3512-2118-0009af100700 Auth Desc. - 00002902-0000-1000-8000-00805f9b34fb

Heartrate

Heartrate Service - 0000180d-0000-10008000-00805f9b34fb Heartrate Measurements Char. - 00002a37-0000-1000-8000-00805f9b34fb Heartate Control (Enabling/Disabling HR) Char. - 00002a39-0000-1000-8000-00805f9b34fb

Pipeline

Connect

  1. Get band's MAC address
  2. Connect to the device via bluetooth using the MAC

Battery Percentage

  1. Read byte array from Battery Char.
  2. The second byte from array is the value you need

Heart Rate

  1. Enable notifications for Heartrate Measurements Char.
  2. Write 3 bytes 0x15, 0x01, 0x01 to Heartate Control Char. (enables heart rate measurements on the device)
  3. Wait for notifications from Heartrate Measurements Char.
  4. Take the second byte from every new byte array you get - that's the value you need
  5. Write 0x15, 0x01, 0x00 to disable measurements

Auth (to prevent disconnecting after every request)

  1. Get Huami auth key - https://github.com/argrento/huami-token (e.g. 0xa3c10e34e5c14637eea6b9efc06106)
  2. Convert your hex key to bytes (e.g. 0xa3, 0xc1, 0x0e4, 0xe5, 0xc1F7, 0xee, 0xa6, 0xb9, 0xef, 0xc0a, 0x06)
  3. Create new AES cipher in ECB mode using converted key as a key
  4. Enable notifications from Auth Char. from Auth Service
  5. Write 2 bytes 0x01, 0x00 to Auth Desc. from Auth Service (enables auth service notifications)
  6. Write 2 bytes 0x02, 0x00 to Auth Char. from Auth Service (this requestes random key from device)
  7. Wait for response from Auth Char., you should get an array of bytes the first three bytes of which are 0x10, 0x02, 0x01. Save other bytes, except those three (data[3:])
  8. Concat 0x03, 0x00 with data[3:] encrypted with cipher made from you auth key
  9. Send it to Auth Char. from Auth Service
  10. If you've done everything right you will recive an array of bytes which starts with 0x10, 0x03, 0x01 from Auth Char. from Auth Service