Python的蓝牙库Bleak报“bleak.exc.BleakError: Could not get GATT services: Unreachable”，如何解决？

Question

I'm a rookie, I've been doing nothing for a few days and have to turn to overflow for help (┬┬﹏┬┬)

Windows 10 downloads a python third-party library of the bleak package and conda's virtual environment tf-gpu-3.7 local install it.

Use bleak's example file: https://github.com/hbldh/bleak/blob/develop/examples/get_services.py

The bluetooth service characteristic value can be obtained normally. I will be according to the document using read_gatt_descriptor and read_gatt_char, Pycharm is suddenly the error. (I didn't change the code for example file at this point)

ERROR:

C:\ProgramData\Anaconda3\envs\tf-gpu-3.7\python.exe C:/Users/Administrator/PycharmProjects/pythonProject/main.py
Traceback (most recent call last):
  File "C:/Users/Administrator/PycharmProjects/pythonProject/main.py", line 27, in <module>
    asyncio.run(main(sys.argv[1] if len(sys.argv) == 2 else ADDRESS))
  File "C:\ProgramData\Anaconda3\envs\tf-gpu-3.7\lib\asyncio\runners.py", line 43, in run
    return loop.run_until_complete(main)
  File "C:\ProgramData\Anaconda3\envs\tf-gpu-3.7\lib\asyncio\base_events.py", line 587, in run_until_complete
    return future.result()
  File "C:/Users/Administrator/PycharmProjects/pythonProject/main.py", line 19, in main
    async with BleakClient(address) as client:
  File "C:\ProgramData\Anaconda3\envs\tf-gpu-3.7\lib\site-packages\bleak-0.15.0a1-py3.7.egg\bleak\backends\client.py", line 61, in __aenter__
    await self.connect()
  File "C:\ProgramData\Anaconda3\envs\tf-gpu-3.7\lib\site-packages\bleak-0.15.0a1-py3.7.egg\bleak\backends\winrt\client.py", line 276, in connect
    await self.get_services()
  File "C:\ProgramData\Anaconda3\envs\tf-gpu-3.7\lib\site-packages\bleak-0.15.0a1-py3.7.egg\bleak\backends\winrt\client.py", line 456, in get_services
    "Could not get GATT services",
  File "C:\ProgramData\Anaconda3\envs\tf-gpu-3.7\lib\site-packages\bleak-0.15.0a1-py3.7.egg\bleak\backends\winrt\client.py", line 105, in _ensure_success
    raise BleakError(f"{fail_msg}: Unreachable")
bleak.exc.BleakError: Could not get GATT services: Unreachable

Picture: https://tupian.li/images/2022/03/26/image4e67fd58c248b7b3.png

I don't know how to solve it.The error is too sudden. It was fine a while ago, but now it doesn't work.

I recreated the virtual environment and re-installed the bleak, and unfortunately the error was repeated.

ESP32 restarted several times, pyCharm wrote again several times, but they all reported the same error. A few days ago, I asked the author for help, but I haven't replied yet...

ESP32 Code: https://github.com/hbldh/bleak/files/8348469/BLE.UART.txt

Captured Bluetooth packets: https://github.com/hbldh/bleak/files/8348459/ERROR.txt

How to resolve the sudden error: Could not get GATT services: Unreachable ?

Answer 1

Sorry, it's not clear where I will describe what is wrong...

The problem is over. I find the cause of the error:

ESP.restart();

I forgot to comment on the esp.restart function, causing ESP32 to keep rebooting. Therefore, the services of Bluetooth cannot be obtained.