https://devzone.nordicsemi.com/f/nordic-q-a/25840/how-to-turn-on-leds-only-for-advertising-timeHi, i am using SDK v8.0 and in main function, initialization like this err_code = bsp_init(BSP_INIT_LED | BSP_INIT_BUTTONS, APP_TIMER_TICKS(100, APP_TIMER_PRESCALER), button_event_handler); and in advertising_start function, calling function isen-USTelligent Community 13Mon, 16 Oct 2017 10:26:27 GMThttps://devzone.nordicsemi.com/thread/101784?ContentTypeID=1Mon, 16 Oct 2017 10:26:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a2e40573-cb23-4188-9319-0f478e6b8ee8Joakim Jakobsen<p>Hi Ketan_Patel. I&#39;m not sure if I understand what you are trying to do.<br /> You want the LED to blink when your device is advertising, but turned OFF when in a connection?</p><div style="clear:both;"></div>