Show measurements from nearby ThermoPro TP357 Hygrometers.

tp357.py

#! /usr/bin/env python3

"""
Show measurements from nearby ThermoPro TP357 Hygrometers.
For more advanced features, use Theengs (https://github.com/theengs/decoder/blob/development/examples/python/ScanAndDecode.py)!
"""

import asyncio
from bleak import BleakScanner


def decode_tp357(manufacturer_id: int, payload: bytes):
    """
    Decode advertisement data from TP357.
    (See https://github.com/theengs/decoder/blob/development/src/devices/TPTH_json.h)
    """
    first_byte = (manufacturer_id >> 8) & 0xFF
    full_frame = bytes([first_byte]) + payload
    # Parse as little endian
    temperature = full_frame[0] | (full_frame[1] << 8)
    # Convert unsigned 16 bit number to signed
    if temperature >= 1 << 15:
        temperature -= 1 << 16
    temperature /= 10.0
    humidity = full_frame[2]
    low_battery = bool(full_frame[3] & 0x01)

    return {
        "temperature": temperature,
        "humidity": humidity,
        "low_battery": low_battery,
    }


async def main():
    scanner = BleakScanner()
    async with scanner:
        async for device, adv in scanner.advertisement_data():
            if device.name and device.name.startswith("TP357S "):
                manufacturer_id = list(adv.manufacturer_data.keys())[0]
                payload = list(adv.manufacturer_data.values())[0]
                print("Address:", device.address)
                print("Name:", device.name)
                print("Data:", decode_tp357(manufacturer_id, payload))
                print()


try:
    asyncio.run(main())
except KeyboardInterrupt:
    pass