bru_send_command.py

#!/usr/bin/env python3

import asyncio
import binascii
import sys

from bleak import BleakClient
from bleak.backends.characteristic import BleakGATTCharacteristic

NOTIFY_UUID = "aae28f01-71b5-42a1-8c3c-f9cf6ac969d0"
WRITE_UUID  = "aae28f02-71b5-42a1-8c3c-f9cf6ac969d0"

def callback(sender: BleakGATTCharacteristic, data: bytearray):
    print(f"{sender}: {binascii.hexlify(data)}")

async def main():
    async with BleakClient(sys.argv[1]) as client:
        await client.start_notify(NOTIFY_UUID, callback)
        print("connected")
        await client.write_gatt_char(WRITE_UUID, bytearray.fromhex(sys.argv[2]), response=True)
        print("written")
        await asyncio.sleep(1)  # allow for any slow messages
        await client.stop_notify(NOTIFY_UUID)

asyncio.run(main())