Replicating bleak code with pygatt: Failure to subscribe

[sunshineinsandiego]

Hi - Asked about this on SO, but no answers so decided to try directly at the source.

I am trying to subscribe to single characteristic on a BLE device. Using bleak I am able to connect to the device and then write / subscribe to characteristics. With virtually identical code using pygatt, I can connect to the same device using my BLED112 dongle, but am not able to write/subscribe to that same characteristic. I am using OSX 11.5, but being able to establish the connection to the peripheral via the BLED112 seems to make the issue code-related rather than OS related.

bleak test program:

import sys
import os
import asyncio
import aioconsole


from bleak import BleakClient


ADDRESS = '28686572-5A71-435E-952A-6F4292F5B04A'
#ADDRESS = '00:55:DA:B7:98:9C'
CHARACTERISTIC_UUID = '273e0003-4c4d-454d-96be-f03bac821358'

if len(sys.argv) == 3:
    ADDRESS = sys.argv[1]
    CHARACTERISTIC_UUID = sys.argv[2]


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


async def run(address):

    async with BleakClient(address) as client:

        await client.connect()
        print("Is connected")

        # start notifications on control characteristic
        await client.start_notify('273e0001-4c4d-454d-96be-f03bac821358', notification_handler)
        # write to control handle, set preset to 21
        await client.write_gatt_char('273e0001-4c4d-454d-96be-f03bac821358', bytearray([0x04, 0x70, 0x32, 0x31, 0x0a]), False)
        # write to control handle get device info
        await client.write_gatt_char('273e0001-4c4d-454d-96be-f03bac821358', bytearray([0x03, 0x76, 0x31, 0x0a]), False)
        # write to control handle for resume
        await client.write_gatt_char('273e0001-4c4d-454d-96be-f03bac821358', bytearray([0x02, 0x64, 0x0a]), False)
        # start notifications on TP9
        await client.start_notify('273e0003-4c4d-454d-96be-f03bac821358', notification_handler)
        # wait for input
        await aioconsole.ainput('Running: Press a key to quit')
        await client.stop_notify('273e0003-4c4d-454d-96be-f03bac821358')


if __name__ == "__main__":

    os.environ["PYTHONASYNCIODEBUG"] = str(1)
    loop = asyncio.get_event_loop()
    loop.run_until_complete(run(ADDRESS))

Output:

$ python3 bleaktest.py                                         
Is connected
13: bytearray(b'\x08{"rc":0}\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
13: bytearray(b'\x10{"ap":"headset",\x00\x00\x00')
13: bytearray(b'\x13"sp":"Blackcomb_rev')
13: bytearray(b'\x03B",":"Blackcomb_rev')
13: bytearray(b'\x10"tp":"consumer",rev')
13: bytearray(b'\x0c"hw":"10.6",er",rev')
13: bytearray(b'\x07"bn":2,0.6",er",rev')
13: bytearray(b'\x0e"fw":"1.0.21",",rev')
13: bytearray(b'\r"bl":"1.0.0",,",rev')
13: bytearray(b'\x07"pv":1,.0.0",,",rev')
13: bytearray(b'\x07"rc":0}.0.0",,",rev')
Running: Press a key to quit
13: bytearray(b'\x08{"rc":0}0.0",,",rev')
31: bytearray(b'\x00\x00\x80\x08\x00z\xa8\xdfL@\x00\xa8!\xb6p\xa0\x00hA\x92')
31: bytearray(b'\x00\x01\x9d0\x00]q\x86\xb5\xb0\x00+\xaf\x96\xf3#\x1a\x00\t\x88')
31: bytearray(b'\x00\x02\x1bh\x04\x00\x06\x14\x18\t\xe8\x00\x05&\x13\xdc%\x00\x01\x97')
...
31: bytearray(b'\x00\x19_\xf1\x85\x9e\xc0\x00GP\xe9\xcb@\x00\t\x9c\xaf\x11\x15\xe4')
...

As you can see from the output, the writes are successful because of the response handles. And the subscriptions are clearly functional given the responses from both the control characteristic and the secondary characteristic.

pygatt test program:

import pygatt
import time
from binascii import hexlify

from pygatt.backends.backend import BLEAddressType



def handle_data(handle, data):
    """
    handle -- integer, characteristic read handle the data was received on
    raw_value -- bytearray, the data returned in the notification
    """

    print(hexlify(data))

#adapter = pygatt.GATTToolBackend('hci0') linux backend
adapter = pygatt.BGAPIBackend()

try:
    adapter.start()
    device = adapter.connect('00:55:DA:B7:98:9C', address_type = BLEAddressType.public)
    print("Is connected")
    # start notifications on control characteristic
    device.subscribe('273e0001-4c4d-454d-96be-f03bac821358', callback = handle_data, wait_for_response = True)
    # write to control handle, set preset to 21
    device.char_write('273e0001-4c4d-454d-96be-f03bac821358', bytearray([0x04, 0x70, 0x32, 0x31, 0x0a]), wait_for_response = True)
    # write to control handle get device info
    device.char_write('273e0001-4c4d-454d-96be-f03bac821358', bytearray([0x03, 0x76, 0x31, 0x0a]), wait_for_response = True)
    # write to control handle for resume
    device.char_write('273e0001-4c4d-454d-96be-f03bac821358', bytearray([0x02, 0x64, 0x0a]), wait_for_response = True)
    time.sleep(5)
    # subscribe to eeg characteristic
    device.subscribe('273e0003-4c4d-454d-96be-f03bac821358', callback = handle_data, indication = False, wait_for_response = True)
    time.sleep(5)
finally:
    print("Adapter stopped")
    adapter.stop()

Output:

$ python3 pygatttest.py
Is connected
Adapter stopped

The pygatt program is able to connect to the device (I can see the indicator light change states from flashing to solid), but subscription fails. I don't know if char_write is working because I don't receive a return notification. Am in the process of trying the logging module to figure out more per the comments below.

Updated output with logging enabled:

$ python3 pygatttest.py    
INFO:pygatt.backends.bgapi.bgapi:Initialized new BGAPI backend
INFO:pygatt.backends.bgapi.bgapi:Auto-detecting serial port for BLED112
DEBUG:pygatt.backends.bgapi.util:Found 4 serial USB devices
DEBUG:pygatt.backends.bgapi.util:Checking serial USB device: /dev/cu.Bluetooth-Incoming-Port - n/a
DEBUG:pygatt.backends.bgapi.util:Checking serial USB device: /dev/cu.usbmodem11 - Low Energy Dongle - CDC data
DEBUG:pygatt.backends.bgapi.util:USB device: Low Energy Dongle - CDC data VID=0x2458 PID=0x0001 on /dev/cu.usbmodem11
INFO:pygatt.backends.bgapi.bgapi:Found BLED112 on serial port /dev/cu.usbmodem11
INFO:pygatt.backends.bgapi.bgapi:Resetting and reconnecting to device for a clean environment
DEBUG:pygatt.backends.bgapi.bgapi:Opening connection to serial port (attempt 1)
INFO:pygatt.backends.bgapi.bgapi:Auto-detecting serial port for BLED112
DEBUG:pygatt.backends.bgapi.util:Found 4 serial USB devices
DEBUG:pygatt.backends.bgapi.util:Checking serial USB device: /dev/cu.Bluetooth-Incoming-Port - n/a
DEBUG:pygatt.backends.bgapi.util:Checking serial USB device: /dev/cu.usbmodem11 - Low Energy Dongle - CDC data
DEBUG:pygatt.backends.bgapi.util:USB device: Low Energy Dongle - CDC data VID=0x2458 PID=0x0001 on /dev/cu.usbmodem11
INFO:pygatt.backends.bgapi.bgapi:Found BLED112 on serial port /dev/cu.usbmodem11
DEBUG:pygatt.backends.bgapi.bgapi:Opening connection to serial port (attempt 1)
INFO:pygatt.backends.bgapi.bgapi:Auto-detecting serial port for BLED112
DEBUG:pygatt.backends.bgapi.util:Found 3 serial USB devices
DEBUG:pygatt.backends.bgapi.util:Checking serial USB device: /dev/cu.Bluetooth-Incoming-Port - n/a
DEBUG:pygatt.backends.bgapi.bgapi:Failed to open serial port
Traceback (most recent call last):
  File ".../pygatt/backends/bgapi/bgapi.py", line 171, in _open_serial_port
    serial_port = self._serial_port or self._detect_device_port()
  File ".../pygatt/backends/bgapi/bgapi.py", line 147, in _detect_device_port
    raise BGAPIError("Unable to auto-detect BLED112 serial port")
pygatt.backends.bgapi.exceptions.BGAPIError: Unable to auto-detect BLED112 serial port
DEBUG:pygatt.backends.bgapi.bgapi:Opening connection to serial port (attempt 2)
INFO:pygatt.backends.bgapi.bgapi:Auto-detecting serial port for BLED112
DEBUG:pygatt.backends.bgapi.util:Found 3 serial USB devices
DEBUG:pygatt.backends.bgapi.util:Checking serial USB device: /dev/cu.Bluetooth-Incoming-Port - n/a
...
INFO:pygatt.backends.bgapi.bgapi:Auto-detecting serial port for BLED112
DEBUG:pygatt.backends.bgapi.util:Found 4 serial USB devices
DEBUG:pygatt.backends.bgapi.util:Checking serial USB device: /dev/cu.Bluetooth-Incoming-Port - n/a
...
DEBUG:pygatt.backends.bgapi.util:Checking serial USB device: /dev/cu.usbmodem11 - Low Energy Dongle - CDC data
DEBUG:pygatt.backends.bgapi.util:USB device: Low Energy Dongle - CDC data VID=0x2458 PID=0x0001 on /dev/cu.usbmodem11
INFO:pygatt.backends.bgapi.bgapi:Found BLED112 on serial port /dev/cu.usbmodem11
INFO:pygatt.backends.bgapi.bgapi:Running receiver
INFO:pygatt.backends.bgapi.bgapi:Disabling advertising
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<ResponsePacketType.gap_set_mode: 58>] within 1.000000s
DEBUG:pygatt.backends.bgapi.bgapi:Received a ResponsePacketType.gap_set_mode packet: Success
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<ResponsePacketType.sm_set_bondable_mode: 51>] within 1.000000s
DEBUG:pygatt.backends.bgapi.bgapi:Received a ResponsePacketType.sm_set_bondable_mode packet: Success
DEBUG:pygatt.backends.bgapi.bgapi:Stopping any outstanding GAP procedure
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<ResponsePacketType.gap_end_procedure: 61>] within 1.000000s
DEBUG:pygatt.backends.bgapi.bgapi:Received a ResponsePacketType.gap_end_procedure packet: Device in wrong state
INFO:pygatt.backends.bgapi.bgapi:Connecting to device at address 00:55:DA:B7:98:9C (timeout 5s)
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<ResponsePacketType.sm_set_bondable_mode: 51>] within 1.000000s
DEBUG:pygatt.backends.bgapi.bgapi:Received a ResponsePacketType.sm_set_bondable_mode packet: Success
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<ResponsePacketType.gap_connect_direct: 60>] within 1.000000s
DEBUG:pygatt.backends.bgapi.bgapi:Received a ResponsePacketType.gap_connect_direct packet: Success
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<EventPacketType.connection_status: 11>] within 5.000000s
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.connection_status packet: Success
INFO:pygatt.backends.bgapi.bgapi:Connection status: handle=0x0, flags=5, address=0xb'9c98b7da5500', connection interval=75.000000ms, timeout=1000, latency=0 intervals, bonding=0xff
INFO:pygatt.backends.bgapi.bgapi:Connected to 00:55:DA:B7:98:9C
Is connected
DEBUG:pygatt.device:Looking up handle for characteristic 273e0001-4c4d-454d-96be-f03bac821358
INFO:pygatt.backends.bgapi.bgapi:Fetching characteristics for connection 0
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<ResponsePacketType.attclient_find_information: 41>] within 1.000000s
DEBUG:pygatt.backends.bgapi.bgapi:Received a ResponsePacketType.attclient_find_information packet: Success
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<EventPacketType.attclient_procedure_completed: 17>] within 30.000000s
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found approved characteristic 00002a05-0000-1000-8000-00805f9b34fb
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found approved characteristic 00002a00-0000-1000-8000-00805f9b34fb
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found approved characteristic 00002a01-0000-1000-8000-00805f9b34fb
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found approved characteristic 00002a04-0000-1000-8000-00805f9b34fb
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found custom characteristic 273e0001-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found custom characteristic 273e0008-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found custom characteristic 273e0009-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found custom characteristic 273e000a-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found custom characteristic 273e000b-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found custom characteristic 273e0002-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found custom characteristic 273e0003-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found custom characteristic 273e0004-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found custom characteristic 273e0005-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found custom characteristic 273e0006-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found custom characteristic 273e0007-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found custom characteristic 273e000c-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found custom characteristic 273e000d-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found custom characteristic 273e000e-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found custom characteristic 273e000f-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found custom characteristic 273e0010-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
INFO:pygatt.backends.bgapi.bgapi:Found custom characteristic 273e0011-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_find_information_found packet: Success
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_procedure_completed packet: Success
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x00002a05-0000-1000-8000-00805f9b34fb is handle 0x3
INFO:pygatt.backends.bgapi.bgapi:Characteristic descriptor 0x00002902-0000-1000-8000-00805f9b34fb is handle 0x4
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x00002a00-0000-1000-8000-00805f9b34fb is handle 0x7
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x00002a01-0000-1000-8000-00805f9b34fb is handle 0x9
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x00002a04-0000-1000-8000-00805f9b34fb is handle 0xb
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x273e0001-4c4d-454d-96be-f03bac821358 is handle 0xe
INFO:pygatt.backends.bgapi.bgapi:Characteristic descriptor 0x00002902-0000-1000-8000-00805f9b34fb is handle 0xf
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x273e0008-4c4d-454d-96be-f03bac821358 is handle 0x11
INFO:pygatt.backends.bgapi.bgapi:Characteristic descriptor 0x00002902-0000-1000-8000-00805f9b34fb is handle 0x12
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x273e0009-4c4d-454d-96be-f03bac821358 is handle 0x14
INFO:pygatt.backends.bgapi.bgapi:Characteristic descriptor 0x00002902-0000-1000-8000-00805f9b34fb is handle 0x15
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x273e000a-4c4d-454d-96be-f03bac821358 is handle 0x17
INFO:pygatt.backends.bgapi.bgapi:Characteristic descriptor 0x00002902-0000-1000-8000-00805f9b34fb is handle 0x18
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x273e000b-4c4d-454d-96be-f03bac821358 is handle 0x1a
INFO:pygatt.backends.bgapi.bgapi:Characteristic descriptor 0x00002902-0000-1000-8000-00805f9b34fb is handle 0x1b
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x273e0002-4c4d-454d-96be-f03bac821358 is handle 0x1d
INFO:pygatt.backends.bgapi.bgapi:Characteristic descriptor 0x00002902-0000-1000-8000-00805f9b34fb is handle 0x1e
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x273e0003-4c4d-454d-96be-f03bac821358 is handle 0x20
INFO:pygatt.backends.bgapi.bgapi:Characteristic descriptor 0x00002902-0000-1000-8000-00805f9b34fb is handle 0x21
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x273e0004-4c4d-454d-96be-f03bac821358 is handle 0x23
INFO:pygatt.backends.bgapi.bgapi:Characteristic descriptor 0x00002902-0000-1000-8000-00805f9b34fb is handle 0x24
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x273e0005-4c4d-454d-96be-f03bac821358 is handle 0x26
INFO:pygatt.backends.bgapi.bgapi:Characteristic descriptor 0x00002902-0000-1000-8000-00805f9b34fb is handle 0x27
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x273e0006-4c4d-454d-96be-f03bac821358 is handle 0x29
INFO:pygatt.backends.bgapi.bgapi:Characteristic descriptor 0x00002902-0000-1000-8000-00805f9b34fb is handle 0x2a
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x273e0007-4c4d-454d-96be-f03bac821358 is handle 0x2c
INFO:pygatt.backends.bgapi.bgapi:Characteristic descriptor 0x00002902-0000-1000-8000-00805f9b34fb is handle 0x2d
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x273e000c-4c4d-454d-96be-f03bac821358 is handle 0x2f
INFO:pygatt.backends.bgapi.bgapi:Characteristic descriptor 0x00002902-0000-1000-8000-00805f9b34fb is handle 0x30
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x273e000d-4c4d-454d-96be-f03bac821358 is handle 0x32
INFO:pygatt.backends.bgapi.bgapi:Characteristic descriptor 0x00002902-0000-1000-8000-00805f9b34fb is handle 0x33
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x273e000e-4c4d-454d-96be-f03bac821358 is handle 0x35
INFO:pygatt.backends.bgapi.bgapi:Characteristic descriptor 0x00002902-0000-1000-8000-00805f9b34fb is handle 0x36
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x273e000f-4c4d-454d-96be-f03bac821358 is handle 0x38
INFO:pygatt.backends.bgapi.bgapi:Characteristic descriptor 0x00002902-0000-1000-8000-00805f9b34fb is handle 0x39
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x273e0010-4c4d-454d-96be-f03bac821358 is handle 0x3b
INFO:pygatt.backends.bgapi.bgapi:Characteristic descriptor 0x00002902-0000-1000-8000-00805f9b34fb is handle 0x3c
INFO:pygatt.backends.bgapi.bgapi:Characteristic 0x273e0011-4c4d-454d-96be-f03bac821358 is handle 0x3e
INFO:pygatt.backends.bgapi.bgapi:Characteristic descriptor 0x00002902-0000-1000-8000-00805f9b34fb is handle 0x3f
DEBUG:pygatt.device:Found <Characteristic uuid=273e0001-4c4d-454d-96be-f03bac821358 handle=14>
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<ResponsePacketType.attclient_attribute_write: 43>] within 1.000000s
DEBUG:pygatt.backends.bgapi.bgapi:Received a ResponsePacketType.attclient_attribute_write packet: Success
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<EventPacketType.attclient_procedure_completed: 17>] within 30.000000s
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_procedure_completed packet: Success
INFO:pygatt.device:Subscribed to uuid=273e0001-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.device:Looking up handle for characteristic 273e0001-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.device:Found <Characteristic uuid=273e0001-4c4d-454d-96be-f03bac821358 handle=14>
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<ResponsePacketType.attclient_attribute_write: 43>] within 1.000000s
DEBUG:pygatt.backends.bgapi.bgapi:Received a ResponsePacketType.attclient_attribute_write packet: Success
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<EventPacketType.attclient_procedure_completed: 17>] within 30.000000s
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_procedure_completed packet: Write not permitted
DEBUG:pygatt.device:Looking up handle for characteristic 273e0001-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.device:Found <Characteristic uuid=273e0001-4c4d-454d-96be-f03bac821358 handle=14>
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<ResponsePacketType.attclient_attribute_write: 43>] within 1.000000s
DEBUG:pygatt.backends.bgapi.bgapi:Received a ResponsePacketType.attclient_attribute_write packet: Success
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<EventPacketType.attclient_procedure_completed: 17>] within 30.000000s
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_procedure_completed packet: Write not permitted
DEBUG:pygatt.device:Looking up handle for characteristic 273e0001-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.device:Found <Characteristic uuid=273e0001-4c4d-454d-96be-f03bac821358 handle=14>
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<ResponsePacketType.attclient_attribute_write: 43>] within 1.000000s
DEBUG:pygatt.backends.bgapi.bgapi:Received a ResponsePacketType.attclient_attribute_write packet: Success
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<EventPacketType.attclient_procedure_completed: 17>] within 30.000000s
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_procedure_completed packet: Write not permitted
DEBUG:pygatt.device:Looking up handle for characteristic 273e0003-4c4d-454d-96be-f03bac821358
DEBUG:pygatt.device:Found <Characteristic uuid=273e0003-4c4d-454d-96be-f03bac821358 handle=32>
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<ResponsePacketType.attclient_attribute_write: 43>] within 1.000000s
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.connection_disconnected packet: Success
DEBUG:pygatt.backends.bgapi.bgapi:Received a ResponsePacketType.attclient_attribute_write packet: Not connected
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<EventPacketType.attclient_procedure_completed: 17>] within 30.000000s
Adapter stopped
INFO:pygatt.backends.bgapi.bgapi:Stopping
INFO:pygatt.backends.bgapi.bgapi:Stopping receiver

I'm not sure if I'm interpreting this information correctly, but it seems as if the subscription is working and that I'm receiving information but the callback is not being fired. Does this have something to do with the write not completed portion of the loop here:

DEBUG:pygatt.device:Found <Characteristic uuid=273e0001-4c4d-454d-96be-f03bac821358 handle=14>
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<ResponsePacketType.attclient_attribute_write: 43>] within 1.000000s
DEBUG:pygatt.backends.bgapi.bgapi:Received a ResponsePacketType.attclient_attribute_write packet: Success
DEBUG:pygatt.backends.bgapi.bgapi:Expecting a response of one of [<EventPacketType.attclient_procedure_completed: 17>] within 30.000000s
DEBUG:pygatt.backends.bgapi.bgapi:Received a EventPacketType.attclient_procedure_completed packet: Write not permitted

I also tried the solution here: https://stackoverflow.com/questions/60888220/pygatt-unable-to-execute-device-subscribe by adding the time.sleep() lines to my code, but the output did not change.

How can I translate my bleak program to pygatt and subscribe successfully using pygatt? Thanks!