main.py

# scan for temp sensors in area.
import aioble
import uasyncio as asyncio
from ubluetooth import UUID
import bluetooth
import struct

__TIMEOUT_MS = 30000
__SCAN_TIM_MS = 20000

async def scan_for_device():
    matching = {}
    async with aioble.scan(duration_ms=__SCAN_TIM_MS, interval_us=30000, window_us=30000, active=True) as scanner:
        async for result in scanner:
            adv_name = str(result.name())
            if 'ATC_' in adv_name:
                print(result, adv_name, result.rssi)
                matching[adv_name] = result.device
    return matching

async def list_services(device):
    try:
        connection = await device.connect(timeout_ms=__TIMEOUT_MS)
        print("Connected to device")
        SERVICE_UUID = bluetooth.UUID(0x181A)
        CHAR_UUID = bluetooth.UUID(0x2A1F)
        service = await connection.service(SERVICE_UUID,timeout_ms=__TIMEOUT_MS)
        if service is not None:
            temp_char = await service.characteristic(CHAR_UUID,timeout_ms=__TIMEOUT_MS)
            data = await temp_char.read(timeout_ms=__TIMEOUT_MS)
            #data = await temp_char.notified(timeout_ms=20000)
            # little endian
            temperature = struct.unpack('<h', data)[0]
            print(temperature)

    except Exception as e:
        print(e)
    if connection is not None:
        await connection.disconnect()
    print("Disconnected from device")

async def main():
    print("Scanning for devices...")
    devices = await scan_for_device()
    if len(devices) > 0:
        for device in devices:
            await list_services(devices[device])
    else:
        print(f'Device {device} not found')

asyncio.run(main())