enable_notifications.py

# -*- coding: utf-8 -*-
"""
Notifications
-------------

Example showing how to add notifications to a characteristic and handle the responses.

Updated on 2019-07-03 by hbldh <henrik.blidh@gmail.com>

"""

import sys
import asyncio
import platform

from bleak import BleakClient


# you can change these to match your device or override them from the command line
CHARACTERISTIC_UUID = "f000aa65-0451-4000-b000-000000000000"
ADDRESS = (
    "24:71:89:cc:09:05"
    if platform.system() != "Darwin"
    else "B9EA5233-37EF-4DD6-87A8-2A875E821C46"
)


def notification_handler(sender, data):
    """Simple notification handler which prints the data received."""
    print("{0}: {1}".format(sender, data))


async def main(address, char_uuid):
    async with BleakClient(address) as client:
        print(f"Connected: {client.is_connected}")

        await client.start_notify(char_uuid, notification_handler)
        await asyncio.sleep(5.0)
        await client.stop_notify(char_uuid)


if __name__ == "__main__":
    asyncio.run(
        main(
            sys.argv[1] if len(sys.argv) > 1 else ADDRESS,
            sys.argv[2] if len(sys.argv) > 2 else CHARACTERISTIC_UUID,
        )
    )