[HELP] BLE STM32WB55 acting as a Central/Peripherical


I’m new to mbed studio, and I’m working on a project to connect multiple periphericals (6 Arduino 33 BLE) to a central/peripherical (STM32WB55). The data that I receive from the arduino, I have to send them to a PC through the STM32WB55.
The problem is that I’m kinda lost with the mbed language and I cannot figure out how to connect properly at least the arduinos to the STM.
I coded the software of the arduino (on the Arduino IDE) to send the data by BLE and it works.

If someone could just give me a bit of help of where to start it will help me a lot.