bleak android error

[ps2229]

• bleak version:0.14.2
• Python version:3
• Operating System:android
• BlueZ version (bluetoothctl -v) in case of Linux:

Description

Trying to implement bleak start_notify function

What I Did

 async def begin_scan1(self):
    async def callback2(sender: int, data: bytearray):
        print(sender, data,'llllll')
    a = []
    scanned_devices = await bleak.BleakScanner.discover(1)

    if len(scanned_devices) == 0:
        print("NO DEVICES")
    scanned_devices.sort(key=lambda device: -device.rssi)
    for device in scanned_devices:
        device1 = f"{device.name}"
        print(device1)
        if device1 == "Bluno":
            try:
                async with bleak.BleakClient(device) as client:
                    print('rr')
                    paired = client.pair(protection_level=2)
                    print(f"Paired: {paired}")
                    COLOR_CHARACTERISTIC = "0000dfb1-0000-1000-8000-00805f9b34fb"
                    uu = '1'
                    write_value = bytearray([int(uu)])
                    await client.write_gatt_char(COLOR_CHARACTERISTIC, write_value) 
                    print('www')
                    await client.start_notify(COLOR_CHARACTERISTIC, callback2)
                    print('wwee')
                    await asyncio.sleep(10.0)
                    print('rrrq')
                    await client.stop_notify(COLOR_CHARACTERISTIC)
               
            except:

                asyncio.sleep(10)
                toast('error')
                self.main_pop.dismiss()
        else:
            toast('Device Not Found', duration=1)
            self.main_pop.dismiss()
    self.main_pop.dismiss()

Was getting error bleak.exc.bleakerror:descriptor None was not found.
Any clue why I am getting this issue or how to solve it.

[dlech]

Duplicate of #828.