CODEWITHSUNDEEP
pythonshellbluetooth
Alexis Le Ny
Alexis Le Ny

Reputation: 1

Python script with bluetoothctl failed

Currently working on a project, I am trying to communicate with my RPi 3 to a BLE device (only reading information from the device). I am using bluez and bluetoothctl. I succeed in connecting the RPi to the device, and can select the attributes and read the characteristics, but I would like to do it with a python script (no need to write the commands).

My issue is, when I ran my code, it seems that it got stuck at the first command. This is my code : 

 import subprocess 
 subprocess.call('bluetoothctl')
 subprocess.call('connect E5:10:78:27:B5:22')

and here is the result

 pi@raspberrypi:~ $ cd Desktop/bluetooth/
 pi@raspberrypi:~/Desktop/bluetooth $ python main.py
 [NEW] Controller 5C:F3:70:87:7E:2E raspberrypi #1 [default]
 [NEW] Device E5:10:78:27:B5:22 PARKING CONNECTE
 [NEW] Controller B8:27:EB:6B:EC:CE raspberrypi 
 [NEW] Device E5:10:78:27:B5:22 PARKING CONNECTE
 [NEW] Device 0C:8F:FF:59:61:48 Wifi a vendre - 5e l'acces 
 [NEW] Device CF:8E:BE:9C:C1:30 Nordic_UART
 [bluetooth]#

Does anyone have a solution or another way to read the characteristics of the device? (and potentially get it back in a file)

Upvotes: 0

Views: 2488

Answers (1)

Montmons
Montmons

Reputation: 1436

I'd advise you to take a look at the subprocess module's docs and especially the subprocess.Popen() function.

I'm not sure if bluetoothctl is a program that takes arguments on launch, or if it has to keep running in order to listen to incoming commands.

If it's the second some untested dummy-code could look like something as:

import subprocess

process = subprocess.Popen(['bluetoothctl'], stdin=subprocess.PIPE, stdout=subprocess.PIPE)
process.stdin.write('connect E5:10:78:27:B5:22')
process.stdin.flush()
process.wait()
output, errors = process.communicate()

output_to_write_to_file = output.decode()

Then, all you have to do is Google on how to write the content of a variable to a file in Python. (Which really shouldn't be too hard to find).

Upvotes: 2

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