Trying to convert Arduino 's Lora library to STM32 code

I want to convert Lora library (sandeepmistry 's Lora lib) to STM32 code (for Atollic TrueSTUDIO).
But in order to achieve this I 'll have to get a better understanding of this library.

(I 'm using the LoraSender(from the examples of Lora in Arduino IDE))

So, when code execution goes to '#include <LoRa.h>', this is when the constuctor of the class ('LoRaClass::LoRaClass()') is called?

Which STM32 core are you using with the Arduino IDE ?

I 'm not using any STM32 core.
I 've built a project with Arduino+Lora, I just want to convert it to STM32+Lora.

I was not quite clear, please let me explain a little better:
I want to convert the Arduino Lora library to TrueSTUDIO code for STM32 (this means to a 'driver' in TrueSTUDIO 's terminology? Or a 'library' maybe? I don't really know).