Device Failing to Connect

[ccorreia-rhaeos]

• bleak version: 0.14.2
• Python version: 3.9
• Operating System: Windows 11 Build: 22000.613
• BlueZ version (bluetoothctl -v) in case of Linux:

Description

I am a first-time bleak user and want to talk to a GATT server with a known address. Connection can be established as shown within Windows Bluetooth settings however it seems like Bleak never recognizes that the device connects and is stuck waiting

What I Did

async with BleakClient(address) as client: print('connected')

Force quitting this yields the following error:

  ----> 1 async with BleakClient(address) as client:
        2         print('connected')
  ~\anaconda3\lib\site-packages\bleak\backends\client.py in __aenter__(self)
       59 
       60     async def __aenter__(self):
  ---> 61         await self.connect()
       62         return self
       63 
  ~\anaconda3\lib\site-packages\bleak\backends\winrt\client.py in connect(self, **kwargs)
      273 
      274         # Obtain services, which also leads to connection being established.
  --> 275         await self.get_services()
      276 
      277         return True
  
  ~\anaconda3\lib\site-packages\bleak\backends\winrt\client.py in get_services(self, **kwargs)
      444             logger.debug("Get Services...")
      445             services: Sequence[GattDeviceService] = _ensure_success(
  --> 446                 await self._requester.get_gatt_services_async(
      447                     BluetoothCacheMode.UNCACHED
      448                 ),
  
  CancelledError: 
  
  
  
  
  
  ```

[hientv1999]

I'm currently having the same issue. This issue just happens on Windows 11. People here say they can make it work by pairing on another app first. https://stackoverflow.com/questions/70178620/bleak-python-does-not-respond-on-connect I have tried with Bluetooth LE Explorer from Microsoft but it didn't work still. Hope someone can give a great solution for this weird behavior rather than rolling back to Windows 10

[dlech]

I usually solve issues like this by logging Bluetooth packets to see what is going on behind the scenes.

[hientv1999]

In my case, it stucks at "Get Services..." for an hour. Sometimes if it doesn't stuck there, it still got this error.

[ccorreia-rhaeos]

Yes I am having the issue as you described

[angrygorilla]

im also having the same issue

[nickbedbury]

I think am also having this issue. bleak==0.14.3 and bleak-winrt==1.1.1 on Windows 10 Pro.

Sometimes I see the log message Services resolved for BleakClientWinRT <BDADDR> but it does not seem to connect properly.

[dlech]

Can everyone please provide a minimal reproducible test case and Wireshark logs of the Bluetooth packets?

[nickbedbury]

I see similar behavior with the connect_by_bledevice.py example from this repo, so that might be a minimal reproducible test case.

>python connect_by_bledevice.py
Traceback (most recent call last):
  File "C:\Users\user\AppData\Local\Programs\Python\Python39-32\lib\asyncio\locks.py", line 226, in wait
    await fut
asyncio.exceptions.CancelledError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\user\AppData\Local\Programs\Python\Python39-32\lib\asyncio\tasks.py", line 490, in wait_for
    return fut.result()
asyncio.exceptions.CancelledError

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:\Users\user\Desktop\connect_by_bledevice.py", line 26, in <module>
    asyncio.run(main(sys.argv[1] if len(sys.argv) == 2 else ADDRESS))
  File "C:\Users\user\AppData\Local\Programs\Python\Python39-32\lib\asyncio\runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "C:\Users\user\AppData\Local\Programs\Python\Python39-32\lib\asyncio\base_events.py", line 647, in run_until_complete
    return future.result()
  File "C:\Users\user\Desktop\connect_by_bledevice.py", line 18, in main
    async with BleakClient(device) as client:
  File "C:\Users\user\AppData\Local\Programs\Python\Python39-32\lib\site-packages\bleak\backends\client.py", line 61, in __aenter__
    await self.connect()
  File "C:\Users\user\AppData\Local\Programs\Python\Python39-32\lib\site-packages\bleak\backends\winrt\client.py", line 268, in connect
    await asyncio.wait_for(event.wait(), timeout=timeout)
  File "C:\Users\user\AppData\Local\Programs\Python\Python39-32\lib\asyncio\tasks.py", line 492, in wait_for
    raise exceptions.TimeoutError() from exc
asyncio.exceptions.TimeoutError

Despite the timeout error, the device I am trying to connect to registered that Windows was connected for a moment.

I am not able to capture Wireshark presently. I'm not too familiar with doing that for Bluetooth...but it shows no activity when I enabled capture.

[dlech]

I am not able to capture Wireshark presently. I'm not too familiar with doing that for Bluetooth...but it shows no activity when I enabled capture.

There are instructions on how to do this at https://bleak.readthedocs.io/en/latest/troubleshooting.html#windows-10

[nickbedbury]

I updated to bleak==0.15.1 and am able to connect now. I haven't done an exhaustive test, but 5 attempts were successful in a row, which seems improved from before.

The hold-up recording Wireshark for me is permission related (work laptop, no admin rights).

I am still unable to write to a CHRC, but perhaps that is some other problem. --> EDIT: can confirm this is a different issue. (needed response=True)