ble_evt_handler function called from where?

[PAJ]

where will function ble_evt_handler be called from?

How does event handling work exactly?

[PAJ]

Hi,

To give more insight on my problem, I am afraid I can do it.

At present, I am unable to come out of below while loop loop becuase of some reason,

while (nrf_fstorage_is_busy(&my_instance)) {

printf("in while loop");

sd_app_evt_wait();
}

I understand sd_app_ent_wait is the function which needs to give the signal from somewhere? 

Am I correct? May I please know how to debug it.