Problems in debug I-CUBE_LRWAN in PINGPONG MODE.

Hello everyone, I am debugging my stm32L073+sx1272 in the pingpong mode. I run the program in debug mode. I know that there is a while loop and the "state" variable should be the variable to implement different functions such as TX RX RX_TIMEOUT and so on. Though I read the manual, I don't know when and where the "state" variable is modified. It is modified in the IRQ Interrupt? Thanks.