driver = BLEDriver( NameError: name 'BLEDriver' is not defined

[echesoni]

I am trying to run the heart_rate_collector.py example in Nordic's pc_ble_driver_py library. When I try to execute the program, I get the following error:

Traceback (most recent call last):
  File "/Users/elainechesoni/Dev/Nordic/pc-ble-driver-py/pc_ble_driver_py/examples/heart_rate_collector.py", line 234, in <module>
    main(serial_port)
  File "/Users/elainechesoni/Dev/Nordic/pc-ble-driver-py/pc_ble_driver_py/examples/heart_rate_collector.py", line 168, in main
    driver = BLEDriver(
NameError: name 'BLEDriver' is not defined

Command used to run example:

python3 heart_rate_collector.py NRF52

(I have also tried running with python instead of python3)

I have modified the code in two places:

• main function starting on Line 166 now reads:
  

  def main(selected_serial_port):
      print("Serial port used: {}".format(selected_serial_port))
      driver = BLEDriver(
          serial_port=selected_serial_port, auto_flash=False, baud_rate=1000000, log_severity_level="info"
      )
  
      print("BLEDriver has been established...")
      adapter = BLEAdapter(driver)
  
      print("Adapter has been established...")
      collector = HRCollector(adapter)
  
      print("Collector has been established...")
      collector.open()
  
      print("Open to advertising devices...")
      # conn = collector.connect_and_discover()
  
      conn = None
  
      while conn == None:
          conn = collector.connect_and_discover()
          print(conn)
  
      if conn is not None:
          # time.sleep(10)
          # time.sleep(1000)
          while True:
              print("Connection not none")
  
      print("Closing collector...")
      collector.close()
      print("Collector has been closed.")

• Line 216 now reads:
  

  if __name__ == "__main__":
       serial_port = #hard coded serial port
       main(serial_port)
       quit()

Things I have tried to resolve this issue:

• Uninstalling Python3.9, and installing Python3.8.8
• I have tried using different serial ports on my computer

The issue still exists.

Additionally, I am using a Mac, and have followed instructions here to properly disable MSD. I am able to verify that the board connects successfully via the serial port by opening nRF Connect and selecting the device.

My system Information:

OS: macOS Big Sur version 11.2.1

Python version 3.8.8

Connectivity firmware version: 4.2.1

SoftDevice API version 5

What am I unable to execute the pc_ble_driver_py example?

Please let me know if I can offer any additional information to help resolve this issue.

[Jørgen Holmefjord]

Hi,

Did you install pc-ble-driver-py through pip, or are you running the example without installing? Have you made sure that it is installed for the same version of python that you are using to run the example?

Best regards,
Jørgen

[echesoni]

Hi Jorgen,

Have you been able to dig into this issue any further? I am still looking for a path forward using the pc-ble-driver-py with a mac...

Best,

Elaine

[Jørgen Holmefjord]

Unfortunately, I have not been able to run pc-ble-driver-py on macOS Big Sur. From the date of the pc-ble-driver-py release, it appears that is have not been tested on Big Sur.

How have you installed Python on your macOS (Homebrew, pyenv, etc)? Are you running the application from another location than where pip installs the package (site-packages)? Could you try to run the example directly from the location where it is installed (see "Location" under "pip show pc-ble-driver-py")?

[echesoni]

Yes, as I replied above, I have installed Python on my computer. I am running the application in PyCharm, with the interpreter pointing to the python 3 installation (there is only one in my system).

I am trying to use the pc-ble-driver-py with Windows now. Still running into issues.

[Jørgen Holmefjord]

Are you seeing the same error on Windows?

[echesoni]

No, I am seeing this issue trying to run the heart_rate_collector.py the pc-ble-driver-py on windows:

"C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python37_64\python.exe" C:/Users/elainechesoni/WindowsDev/pc-ble-driver-py/pc_ble_driver_py/examples/heart_rate_collector.py NRF52
Traceback (most recent call last):
  File "C:/Users/elainechesoni/WindowsDev/pc-ble-driver-py/pc_ble_driver_py/examples/heart_rate_collector.py", line 208, in <module>
    init(sys.argv[1])
  File "C:/Users/elainechesoni/WindowsDev/pc-ble-driver-py/pc_ble_driver_py/examples/heart_rate_collector.py", line 56, in init
    from pc_ble_driver_py.ble_driver import (
  File "C:\Users\elainechesoni\WindowsDev\pc-ble-driver-py\pc_ble_driver_py\ble_driver.py", line 80, in <module>
    import pc_ble_driver_py.lib.nrf_ble_driver_sd_api_v5 as driver
ModuleNotFoundError: No module named 'pc_ble_driver_py.lib.nrf_ble_driver_sd_api_v5'

I created a ticket detailing the issue here.

[Jørgen Holmefjord]

There are a few other reports of users having issues with running pc-ble-driver-py on macOS Big Sur:

• https://devzone.nordicsemi.com/f/nordic-q-a/72894/error-on-macos-when-trying-to-run-heart_rate_collector-py-file-modulenotfounderror-no-module-named-pc_ble_driver_py-lib-nrf_ble_driver_sd_api_v5
• https://devzone.nordicsemi.com/f/nordic-q-a/72883/receiving-modulenotfounderror-no-module-named-pc_ble_driver_py-when-trying-to-run-pc-ble-driver-py-example-heart-rate-collector-on-macos

You may follow the first thread to see if the developers will come up with some solutions or new/tested releases for this macOS version, but it looks like it may be some path issues with pc-ble-driver-py/python finding the libraries.