Testing BLE? Ditch your phone!

import asyncio
import sys
from bleak import BleakScanner, BleakClient
from bleak.exc import BleakError
FIRMWARE_REV_UUID = "00002a26-0000-1000-8000-00805f9b34fb"
EXPECTED_FIRMWARE_REV = b'3.1'
async def run(address):
    device = await BleakScanner.find_device_by_address(address, timeout=20.0)
    if not device:
        raise BleakError('Device not found')
    try:
        async with BleakClient(device, timeout=5) as client:
            try:
                model_number = await client.read_gatt_char(FIRMWARE_REV_UUID)
            except (EOFError, BleakError):
                raise SystemExit(f'Could not read firmware revision of {device}')
            else:
                if model_number != EXPECTED_FIRMWARE_REV:
                    raise SystemExit(f"{device.name} Firmware Revision: {''.join(map(chr, model_number))}")
                else:
                    print("Firmware revision is correct!")
    except (BleakError, asyncio.TimeoutError):
        raise SystemExit(f'Could not connect to {device}')
def main():
    loop = asyncio.get_event_loop()
    address = sys.argv[1]
    loop.run_until_complete(run(address))
if __name__ == '__main__':
    main()