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I have two Python scripts that i need to communicate with each another. The first is a GUI made in PySide2. The GUI consists of simple controls for controlling a bluetooth audio device (play, pause, next, previous, etc...). These commands operate with a second python script that i found. The second script is a loop that waits for these commands to be entered and responds once those commands are executed. I'm pretty new to programming, i'm guessing this is essentially connecting a front end with a back end, but its something i've never done before.

I've written a simplified version of my GUI to only display the controls i need. The "back-end" is also below but can originally be found here: https://scribles.net/controlling-bluetooth-audio-on-raspberry-pi/

I've previously asked a similar question and was given a solid and working answer by @eyllanesc here: Execute command to a Python script from separate Python script? However, using the QProcess method i could not work out how to get the print outputs from the back-end into the front-end script. The error messages print correctly however. I have tried playing around with sys.stdout in the back-end, variants of process.read, and QByteArrays but can't seem to get anything going.

The other issue i'm having is that the script will only work if a bluetooth device is connected prior to starting the script. If i disconnect while it is running and try to reconnect, it will no longer accept commands. If there is also a way to monitor whether a device is playing/paused so that the play/pause button can update depending on the devices state, that would also be useful, but its not important at this stage.

Theres a number of ways that it can be done, but i feel that ultimately it would be better for me to have both scripts integrated into one, however i'm open to any solution that works. If anyone has any advice or can get me started i'd be very appreciative!

Front-end:

Summary: I have a microbit connected to a rpi-zero. I coded the microbit, when A button is pressed it will then send data through uart.write to the rpi-zero.

In this test, the microbit will uart.write("Test"), write a "Test" word to the rpi-zero.

My ultimate goal is to use rpi-zero's BLE capabilities to act as a control device with instructions sent from microbit buttons.

I found this GATT Server Code written in python for rpi. Which it ran with no problem at all.

The code below will be used for listening to microbit uart service and check whether if data received is "Test":

I have a raspberry pi zero setup as a BLE GATT server, which I followed exactly with this guide.

My ultimate goal is just trying to send a text from the pi zero to my laptop.

Being a little familiar with python, I have tried to use Bleak to communicate with the GATT server but for some reason, I'm never able to connect to the GATT server. So I gave up trying to tinker with Bleak.

( Please note that I have used nRF Toolbox to verify that the pi zero BLE GATT server is set up correctly )

Fast foward, one day I saw this BLE GATT Client Sample from Microsoft. So I downloaded VisualStudio and followed the guide to deploy the sample.

Everything worked fine, I can connect to the GATT server and write data to the specific RX characteristics.

But the real problem resides on the TX characteristics, when I try to send data from the GATT server console to the laptop. The BLE Client Sample will show the value as "Unknown Format"

It seems that the data will be encoded ( value.append(dbus.Byte(c.encode())) ) with this before updating the TX charactersitics.

I tried to Google about this, but any further research will only make my head burn harder.

I'm sorry, can anyone tell me how to fix this "Unknown Format" data decode problem?

Thanks so much in advance.

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