https://devzone.nordicsemi.com/f/nordic-q-a/7096/send-notification-via-gpiote-interrupteHi, I am using a gpiote interrupte handle function to send a notification to the master,but I find when the sd_ble_gatts_hvx() function is used,the interrupte handle function breaks down and the system has no reaction.Therefore there is no any erroren-USTelligent Community 13Tue, 19 May 2015 12:18:32 GMThttps://devzone.nordicsemi.com/thread/25074?ContentTypeID=1Tue, 19 May 2015 12:18:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:acea0685-368b-44c2-a8b5-f5cd3c934b2fStefan Birnir Sverrisson<p>Hi</p> <p>This is probably because of priority violation. You can not call a sd_* function from a context with higher ARM priority than 2. The app_gpiote has a default ARM priority 1. Explanation on how the priorities work is given in <a href="https://devzone.nordicsemi.com/question/32040/using-i2c-nus-and-two-timer-interrupts-reading-sensor-from-both-timer-interrupts/?answer=32422#post-id-32422">this thread</a>. To avoid this problem, you should use the scheduler to call sd_* functions form the main context, see <a href="https://devzone.nordicsemi.com/question/33283/scheduler-benefits/">this thread</a>.</p><div style="clear:both;"></div>