Am using an lilygo t- beam board to transmit data to stm32f103c8 interfaced with rfm95 lorawan module(sx1276 chip) and it does not work while following keenly your tutorial video and using DIO0 and EXTI Callback function.
When i use the stm32 and rfm95 module for transmit, with the esp32 as receiver, it works well.
For the esp32 am using the Arduino LORA library by Sandeep Mistry.