example_ble_1.py: Can't find device then timeout and crash

[nasrat-v]

Hi,

First thanks you for all the great job you've made in this repository.

I run the example_ble_1.py as sudo with Python 3.5.7 to communicate with STEVAL-BCN002V1 (BlueTile)

It look like errors are from the bluepy packages :

Discovery started.
Traceback (most recent call last):
  File "/usr/local/lib/python3.5/site-packages/blue_st_sdk/manager.py", line 313, in discover
    self._scanner.scan(timeout_s)
  File "/usr/local/lib/python3.5/site-packages/bluepy/btle.py", line 854, in scan
    self.stop()
  File "/usr/local/lib/python3.5/site-packages/bluepy/btle.py", line 803, in stop
    self._mgmtCmd(self._cmd()+"end")
  File "/usr/local/lib/python3.5/site-packages/bluepy/btle.py", line 312, in _mgmtCmd
    raise BTLEManagementError("Failed to execute management command '%s'" % (cmd), rsp)
bluepy.btle.BTLEManagementError: Failed to execute management command 'scanend' (code: 11, error: Rejected)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "./example_ble_1.py", line 312, in <module>
    main(sys.argv[1:])
  File "./example_ble_1.py", line 189, in main
    manager.discover(SCANNING_TIME_s)
  File "/usr/local/lib/python3.5/site-packages/blue_st_sdk/manager.py", line 325, in discover
    raise BlueSTInvalidOperationException(msg)
blue_st_sdk.utils.blue_st_exceptions.BlueSTInvalidOperationException: 
Bluetooth scanning requires root privilege, so please run the script with "sudo".

[ArthurKun21]

have you tried this

sudo apt-get install python3-pip libglib2.0-dev for python3 or sudo apt-get install python-pip libglib2.0-dev for python2

it was part of Bluepy

I also did some sudo apt-get update and sudo apt-get upgrade

[nasrat-v]

Hi, thanks for your quick answer.

I'm on Archlinux. Glib is installed, same for Python2.7, 3.5 and 3.7. My system is up to date.

If i try it with Python 2.7, I only got blue_st_sdk errors. I think the problem is coming from archlinux. I probably should install debian or ubuntu ?

Discovery started.
Traceback (most recent call last):
  File "example_ble_1.py", line 312, in <module>
    main(sys.argv[1:])
  File "example_ble_1.py", line 189, in main
    manager.discover(SCANNING_TIME_s)
  File "/usr/lib/python2.7/site-packages/blue_st_sdk/manager.py", line 325, in discover
    raise BlueSTInvalidOperationException(msg)
blue_st_sdk.utils.blue_st_exceptions.BlueSTInvalidOperationException: 
Bluetooth scanning requires root privilege, so please run the script with "sudo".

[nasrat-v]

On what platform do you use this library ? I tried Archlinux, Ubuntu and Debian and still the same errors.

Do I need to use a x86 linux ?

[ArthurKun21]

I think Debian would be good since i am using Raspbian Buster which is based Debian Buster and the developer of bluepy have develop it in Raspberry Pi (one of the reasons that i choose to use Raspberry Pi) and according to him

At present it runs on Linux only; I've mostly developed it using a Raspberry Pi, but it will also run on x86 Debian Linux.

[ArthurKun21]

you could also see this reply.

VM couldn't figure out how to talk to the bluetooth hardware correctly.

it might be one your configuration on how to talk to the bluetooth hardware

[nasrat-v]

Okay so I tried on Ubuntu x64, Debian x64 and x86. Still the same error. I should probably try directly on a Raspbian.

Maybe the problem is coming from the way I install all the depencies (a conflict version between some packets).

[musk95]

Please use this command 'sudo python3 example_ble_1.py'.

pi@raspberrypi:~ $ python3 example_ble_1.py

##################

BlueST Example

##################

Scanning Bluetooth devices...

Discovery started. Traceback (most recent call last): File "/usr/local/lib/python3.7/dist-packages/blue_st_sdk/manager.py", line 313, in discover self._scanner.scan(timeout_s) File "/usr/local/lib/python3.7/dist-packages/bluepy/btle.py", line 852, in scan self.start(passive=passive) File "/usr/local/lib/python3.7/dist-packages/bluepy/btle.py", line 790, in start self._mgmtCmd("le on") File "/usr/local/lib/python3.7/dist-packages/bluepy/btle.py", line 312, in _mgmtCmd raise BTLEManagementError("Failed to execute management command '%s'" % (cmd), rsp) bluepy.btle.BTLEManagementError: Failed to execute management command 'le on' (code: 20, error: Permission Denied)

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "example_ble_1.py", line 312, in main(sys.argv[1:]) File "example_ble_1.py", line 189, in main manager.discover(SCANNING_TIME_s) File "/usr/local/lib/python3.7/dist-packages/blue_st_sdk/manager.py", line 325, in discover raise BlueSTInvalidOperationException(msg) blue_st_sdk.utils.blue_st_exceptions.BlueSTInvalidOperationException: Bluetooth scanning requires root privilege, so please run the script with "sudo".

pi@raspberrypi:~ $ sudo python3 example_ble_1.py

##################

BlueST Example

##################

Scanning Bluetooth devices...

Discovery started. New device discovered: BCN-002. Discovery stopped.

Available Bluetooth devices: 1) BCN-002: [e0:f5:f4:fe:de:ad]

[nasrat-v]

Thanks for you answer.

But as I said in my first comment: "I run the example_ble_1.py as sudo with Python 3.5.7". I also tried with python2.

[ArthurKun21]

could you try adding this line os.system("sudo service bluetooth start") here? and be sure to add import os first

[nasrat-v]

Ok, I solved the issue. systemctl status bluetooth.service and rfkill list showed me that rfkill was blocking my bluetooth service to work properly.

I just used rfkill unblock all to unblock the service. Then the exemple_ble.py script start working with Python 3.8.

Thanks for help !