https://devzone.nordicsemi.com/f/nordic-q-a/10878/nrf51822-gzll-used-softdevice-apiI need to do this, A product ble and Gazell should be used. Switch bluetooth or Gazell mode by pressing the button, but ble and Gazell not used the same time. When I switch to Gazell mode Because of there is no initialization ble protocol stack, so thaten-USTelligent Community 13Wed, 16 Dec 2015 11:35:41 GMThttps://devzone.nordicsemi.com/thread/40693?ContentTypeID=1Wed, 16 Dec 2015 11:35:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:028e81fc-da5f-4508-b7ad-15e8000f4808Hung Bui<p>Hi Cesar,</p> <p>I don&#39;t think app_scheduler.c use any softdevice API call. If there is no event queued that require any call to softdevice API, you should be fine.</p> <p>Could you check which error is thrown ?</p> <p>Note that if you don&#39;t plan to use app scheduler, you can always use a flag to enable or disable the call to app_sched_execute() whether the softdevice is used or not.</p> <ul> <li>Yes, you can use Gazell when in timeslot. But for your application I don&#39;t think you need to do Gazell with timeslot.</li> </ul><div style="clear:both;"></div>