https://devzone.nordicsemi.com/f/nordic-q-a/1965/how-to-send-data-when-notification-is-acticveI need to send a data package when radio is ON every time but I try to send data by &quot;sd_ble_gatts_hvx()&quot; I find it can not work,it seems that I can&#39;t call this API to send data. I what to know how to use SWI1_IRQHandler , if I what to prepare anden-USTelligent Community 13Mon, 24 Mar 2014 11:14:39 GMThttps://devzone.nordicsemi.com/thread/8458?ContentTypeID=1Mon, 24 Mar 2014 11:14:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d99cb9ea-820d-47af-b747-7759570b8c3fOle Morten<p>I believe that the code snippet you show here will cause a HardFault. Remember that you can&#39;t call softdevice API functions from APP_HIGH, so instead, you need to set a flag or put an event in the scheduler queue to actually send the data.</p> <p>You can read more about this <a href="https://devzone.nordicsemi.com/index.php/how-to-redefine-ppi-tasks-inside-a-timer-interrupt">here</a>, and in the Reference Manual section that refers to.</p><div style="clear:both;"></div>