ESP32 esp-idf BLE UART example in C similar to Arduino

Hello to all colleagues,

I have a question and a request at the same time, maybe any colleagues have an example in C for esp-idf similar to the arduino BLE UART? Before I start rewriting it I thought I would ask here. I'm generally starting to embrace QT and have written an Android terminal type app (based on the course) which works well with the example on Arduino. I've tried with the examples from esp-idf for BLE however I'm a bit stuck with the services and sending data from ESP to Android.

Have you browsed this website?
https://github.com/JoaoLopesF/Esp-Mobile-Apps-Esp32
Admittedly in C++, but already without Arduino HAL .

Thanks a lot! I've scrolled through this code before, but it was in the early days when I was starting to think about communication over BT. And it's actually easier to analyse such code.