[Python] Python Bleak start_notify callback not invoked

I tried to connect my ble device using Python bleak module. The device is getting scanned and connected. I try to enable notification for one of the characteristic using start_notify function.

await client.start_notify(notify_char,notify_callback)
def notify_callback(handle, data):
print(handle, data)


The notify_callback function is not getting invoked.

Any pointers on how to get data notified continously from ble.

Full code:

import asyncio
import sys from bleak
import BleakClient

notify_char = "2ea78970-7d44-44bb-b097-26183f402401"

def notify_callback(handle: int, data: bytearray):
print(f"{handle}: {data}")

async def main(address):
async with BleakClient(address) as client:
if (not client.is_connected):
raise "client not connected"
services = await client.get_services()
await client.start_notify(notify_char,notify_callback)
await asyncio.sleep(5.0)
await client.stop_notify(notify_char)

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