Continue advertising even after getting connected

[xtian]

Good day,

i would like to know if it is possible to continue broadcasting even if the device is already connected. i am using nrf52832 with SDK17.1

[Susheel Nuguru]

If you have NRF_SDH_BLE_PERIPHERAL_LINK_COUNT more than 1, then you can just call advertising_start() in the ble_evt_handler-> BLE_GAP_EVT_CONNECTED event. The code for advertising start is shown in many ble_peripheral examples.

/**@brief Function for starting advertising.
 */
static void advertising_start(void)
{
    ret_code_t           err_code;

    err_code = sd_ble_gap_adv_start(m_adv_handle, APP_BLE_CONN_CFG_TAG);
    APP_ERROR_CHECK(err_code);

    bsp_board_led_on(ADVERTISING_LED);
}

[xtian]

when device gets connected, i want it to advertise as non-connectable. and when it gets disconnected, it should return to connectable advertisement again. is this possible?

[Susheel Nuguru]

Yes, you can do that. In the connected event you can do below and start the advertiser

    static ble_gap_adv_params_t m_adv_params;  

    // Initialize advertising parameters (used when starting advertising).
    memset(&m_adv_params, 0, sizeof(m_adv_params));

    m_adv_params.properties.type = BLE_GAP_ADV_TYPE_NONCONNECTABLE_NONSCANNABLE_UNDIRECTED;
    m_adv_params.p_peer_addr     = NULL;    // Undirected advertisement.
    m_adv_params.filter_policy   = BLE_GAP_ADV_FP_ANY;
    m_adv_params.interval        = NON_CONNECTABLE_ADV_INTERVAL;
    m_adv_params.duration        = 0;       // Never time out.

    err_code = ble_advdata_encode(&advdata, m_adv_data.adv_data.p_data, &m_adv_data.adv_data.len);
    APP_ERROR_CHECK(err_code);

    err_code = sd_ble_gap_adv_set_configure(&m_adv_handle, &m_adv_data, &m_adv_params);
    APP_ERROR_CHECK(err_code);

When you disconnect and get the disconnected event, you can stop the non connectable advertising and reconfigure it to be connectable and start the advertiser again as connectable.

[xtian]

i get an error in the sd_ble_gap_adv_set_configure.

<error> app: ERROR 4 [NRF_ERROR_NO_MEM] at: 0x0002871F