BLE Peripheral restarts after 3 minutes when not connected to any device via BLE

[User1321]

Hi Nordic, 

my BLE peripheral with the nrf52840 and sdk 15.3 with s140 restarts if not connected after 180s. I assume that the reason is the .config.ble_adv_fast_timeout  parameter but if i set this ne to 0, application does not start with an ble_advertising_start() error.  How should i set this= i want the peripheral to keep advertising until someone connects to it. 

void advertising_init(void)
{
    uint32_t               err_code;
    ble_advertising_init_t init;

    memset(&init, 0, sizeof(init));

    init.advdata.name_type          = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance = false;
    init.advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;

    init.srdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    init.srdata.uuids_complete.p_uuids  = m_adv_uuids;

    init.config.ble_adv_fast_enabled  = true;
    init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
    init.config.ble_adv_fast_timeout  = APP_ADV_DURATION;
    init.evt_handler = on_adv_evt;

    err_code = ble_advertising_init(&m_advertising, &init);
    APP_ERROR_CHECK(err_code);

    ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);
}

void advertising_start(void)
{
    uint32_t err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST);
    APP_ERROR_CHECK(err_code);
    NRF_LOG_INFO("advertising_start");            
}

I could also start the advertising again after the timeout but would that be ok?

Thanks!

[Amanda Hsieh]

Hi, 

Since you've set BLE_GAP_ADV_FLAG_LE_LIMITED_DISC_MODE, the maximum advertising timeout allowed will be 180 seconds. If you change this to BLE_GAP_ADV_FLAG_LE_GENERAL_DISC_MODE it will be unlimited, and you can set the ble_adv_fast_timeout_set to 0 to let it advertise without a timeout.

-Amanda H.

[User1321]

Unfortunatelly, while using the SDK 15.3, when using both 

init.advdata.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE; 

or

init.advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;

In both cases, the peripheral stops advertising after some minutes, the only thing that i found to work there is to start again the advertising while receiving the BLE_ADV_EVT_IDLE event.  Is this a wrong approach? 

[Amanda Hsieh]

That could be an alternate. 

-Amanda