https://devzone.nordicsemi.com/f/nordic-q-a/77379/s110-softdevice-useHow to make sure that I have used S110 Softdevice API function? Customer suspected that I did not use S110 function,but i can&#39;t explanation.en-USTelligent Community 13Tue, 13 Jul 2021 14:01:00 GMThttps://devzone.nordicsemi.com/thread/319850?ContentTypeID=1Tue, 13 Jul 2021 14:01:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:645a731e-43e2-4ce0-8e8d-c8985d960abeHung Bui<p>Hi Ray,&nbsp;<br />Could you give some more information ? If you use any BLE function on the nRF51 you are using the S110 (if you have flashed the S110 softdevice ) .In the source code you can show that you called many softdevice API (sd_* APIs)&nbsp;<br />The list of the functions can be found in ble_gap.h for example.&nbsp;</p><div style="clear:both;"></div>