Fails every time with HCI TIMEOUT error on `_bleio.Connection..discover_remote_services()`

[o-murphy]

CircuitPython version and board name

LILYGO T-Display S3, ESP32S3

Code/REPL

async def _discover_services_task(self):
        if hasattr(self._connection, "_bleio_connection"):
            bleio_conn = self._connection._bleio_connection
            if hasattr(bleio_conn, "discover_remote_services"):

                await asyncio.sleep(1.0)
                try:
                    await asyncio.sleep(1)
                    return bleio_conn.discover_remote_services()
                except Exception as e:
                    raise BleakError(f"Failed to discover remote services: {e}")
        raise BleakError("Discover remote services not available")

Behavior

1368.945: DEBUG - Connected to BLE device @ 55:26:5e:02:d3:6b
1368.949: DEBUG - Retrieving services from BLE device @ 55:26:5e:02:d3:6b
Traceback (most recent call last):
  File "/lib/bleak/backends/circuitpython/client.py", line 114, in _discover_services_task
_bleio.BluetoothError: Unknown BLE error: 7

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 38, in <module>
  File "asyncio/core.py", line 346, in run
  File "asyncio/core.py", line 299, in run_until_complete
  File "asyncio/core.py", line 283, in run_until_complete
  File "asyncio/funcs.py", line 181, in gather
  File "asyncio/core.py", line 283, in run_until_complete
  File "<stdin>", line 22, in main
  File "/lib/bleak/__init__.py", line 565, in __aenter__
  File "/lib/bleak/__init__.py", line 587, in connect
  File "/lib/bleak/backends/circuitpython/client.py", line 79, in connect
  File "asyncio/core.py", line 283, in run_until_complete
  File "/lib/bleak/backends/circuitpython/client.py", line 116, in _discover_services_task
BleakError: Failed to discover remote services: Unknown BLE error: 7

Description

I'm trying to make bleak-compatible backend for CircuitPython, for now every time I wanna discover all services for peripheral i got _bleio.BluetoothError 7 HCI TIMEOUT

Additional information

No response

[dhalbert]

Could you show a complete simple example to reproduce?

Where are you getting HCI TIMEOUT from? ESP32-S3 has native BLE and does not use HCI. But there are multiple LILYGO Display boards, both ESP32 and ESP32-S3. What is the exact name of the .uf2 or .bin file you're loading onto the LILYGO? I want to confirm it is the S3 Lilygo.

[dhalbert]

Could you give an example that is not using your bleak layer, but just _bleio or adafruit_ble?

[o-murphy]

Could you give an example that is not using your bleak layer, but just _bleio or adafruit_ble?

Yes, simply

from _bleio import UUID
from adafruit_ble import BLERadio
from adafruit_ble.advertising import Advertisement
from adafruit_ble.advertising.standard import (
    ProvideServicesAdvertisement,
    SolicitServicesAdvertisement,
)

radio = BLERadio()


scan_results = radio.start_scan(
    Advertisement,
    ProvideServicesAdvertisement,
    SolicitServicesAdvertisement,
    active=True,
    timeout=20
)

lookup_service = UUID("f47b5e2d-4a9e-4c5a-9b3f-8e1d2c3a4b5c")

found_adv = None
for adv in scan_results:
    if isinstance(adv, ProvideServicesAdvertisement):
        for srv in adv.services:
            if srv == lookup_service:
                found_adv = adv
                radio.stop_scan()
                break
    
if found_adv:
    connection = radio.connect(found_adv.address)
    is_connected = connection.connected
    print("Is connected:", is_connected)
    if is_connected:
        discovered_services = connection._bleio_connection.discover_remote_services()
        print(discovered_services)
else:
    print("Not found")

Is connected: True
Traceback (most recent call last):
  File "<stdin>", line 36, in <module>
_bleio.BluetoothError: Unknown BLE error: 7

[o-murphy]

Could you show a complete simple example to reproduce?

Where are you getting HCI TIMEOUT from? ESP32-S3 has native BLE and does not use HCI. But there are multiple LILYGO Display boards, both ESP32 and ESP32-S3. What is the exact name of the .uf2 or .bin file you're loading onto the LILYGO? I want to confirm it is the S3 Lilygo.

Possibly i'm wrong, but i found that: A Bluetooth error 0x07 indicates that a device is out of range or Memory Capacity Exceeded

[o-murphy]

Could you show a complete simple example to reproduce?

Where are you getting HCI TIMEOUT from? ESP32-S3 has native BLE and does not use HCI. But there are multiple LILYGO Display boards, both ESP32 and ESP32-S3. What is the exact name of the .uf2 or .bin file you're loading onto the LILYGO? I want to confirm it is the S3 Lilygo.

The latest one from https://circuitpython.org/board/lilygo_tdisplay_s3/
v9.2.8, same happen on 9.2.6

Adafruit CircuitPython 9.2.8 on 2025-05-28; LILYGO T-DISPLAY S3 v1.2 with ESP32S3

sys.platform=Espressif, os.uname()=(sysname='ESP32S3', nodename='ESP32S3', release='9.2.8', version='9.2.8 on 2025-05-28', machine='LILYGO T-DISPLAY S3 v1.2 with ESP32S3')
sys.version=3.4.0; CircuitPython 9.2.8 on 2025-05-28
sys.implementation=(name='circuitpython', version=(9, 2, 8, ''), _machine='LILYGO T-DISPLAY S3 v1.2 with ESP32S3', _mpy=774)

[o-murphy]

You can try it with bitchat app. I used it to simulate ble device with my iphone/android