nRF52840 DK restarts application after 3 minutes when not connected to any device via BLE

[Mathangopal]

Hi. I have edited the Heart Rate Service Example project in SDK 17.02 and I am currently using nRF52840 DK.

I am not sure of the reason why the application restarts after 3 minutes when it is idle.

It does not restart when it is connected to nRF toolbox mobile app.

Is there a reason why?

I will appreciate the help.

Thank you.

[abdelali]

Hi,

the application advertising interval is 180 seconds (3 minutes). 

#define APP_ADV_DURATION                    18000                                   /**< The advertising duration (180 seconds) in units of 10 milliseconds. */

If the device wasn't connected within that period, the application enters the idle state ( adv event : BLE_ADV_EVT_IDLE ) in which it enters the deep sleep mode.

static void on_adv_evt(ble_adv_evt_t ble_adv_evt)
{
    ret_code_t err_code;

    switch (ble_adv_evt)
    {
        case BLE_ADV_EVT_FAST:
            NRF_LOG_INFO("Fast advertising.");
            err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING);
            APP_ERROR_CHECK(err_code);
            break;

        case BLE_ADV_EVT_IDLE:
            sleep_mode_enter();
            break;

        default:
            break;
    }
}

One reason of the restart could be that you pressed the wakeup button.

Note that the wakeup resets the application, means that it'll restart..

Hope that helps,

[Mathangopal]

Hi. Is the wake button the Reset button?