https://devzone.nordicsemi.com/f/nordic-q-a/4973/how-to-reconnect-after-disconnecting-via-ios-appI&#39;m using the example ble_app_hrs along with the HRM part of the nRF Toolbox iOS app . It makes sense to handle this in on_ble_evt in main.c but am unclear how I can recover from enter system mode off. static void on_ble_evt(ble_evt_t * p_ble_evt)en-USTelligent Community 13Fri, 10 Apr 2015 07:49:55 GMThttps://devzone.nordicsemi.com/thread/17521?ContentTypeID=1Fri, 10 Apr 2015 07:49:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a85f7820-6eea-467e-b841-435c89e3b746charlie<p>If i want to pair the 51822 with an IOS app some time without the 51822 powre off and on,can i use a button ISR to excute the advertising_start() function? how should i do? thank you in advance!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/17520?ContentTypeID=1Wed, 31 Dec 2014 23:23:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:052d91fe-dfe9-432e-892c-2f7ebe625400la-ble<p>Assuming all other denitializations/initializations specific to your firmware app and the template overhead are handled appropriately, all you really need to do is re-start advertising at that point.</p> <pre><code>case BLE_GAP_EVT_DISCONNECTED: /* // @note Flash access may not be complete on return of this API. System attributes are now // stored to flash when they are updated to ensure flash access on disconnect does not // result in system powering off before data was successfully written. // Go to system-off mode, should not return from this function, wakeup will trigger // a reset. system_off_mode_enter(); */ // TODO: Deinit whatever you need, stop timers, etc // Restart advertising advertising_start(); break; </code></pre><div style="clear:both;"></div>