Bonjour Gisèlle
As I understand it, there are similarities between STM32 microcontrollers and Arduino microcontrollers in terms of programming them (C code). The HC-05 should work with "Classic" Bluetooth, typically v2.x + EDR.
There are many App Inventor examples using Classic Bluetooth, just search this forum :)
My website has links on various Microcontrollers and Bluetooth - it's important to know what the various versions of Bluetooth can and cannot do.