How can I make an automatic Bluetooth connection?

RE: How can I make an automatic Bluetooth connection?

Kenneth — Tue, 22 Sep 2020 07:39:18 GMT

The application may call ble_advertising_start() at any time, for instance on the BLE_GAP_EVT_CONNECTED event.

Best regards,
Kenneth

RE: How can I make an automatic Bluetooth connection?

schosdas — Tue, 22 Sep 2020 07:16:30 GMT

Hello Kenneth!

As you said, I can enable or disable automatic pairing by adding that code.

But it only works when I manually disconnect it. The function I want is similar to Bluetooth earphones. The Bluetooth connection may be lost, such as when the Central is out of range of Bluetooth communication or when power is off. And if it's possible to reconnect, It is sending a pairing request to the Central that previously connected to.

Can you help me with this?

Thank you.

static 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_GENERAL_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; //advertising timeout
    init.evt_handler = on_adv_evt;

    init.config.ble_adv_on_disconnect_disabled = false; //Auto pairing test, true : if disconnet no advertising(scan) / false : if disconnet auto advertising(scan) and connected

    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);
}

RE: How can I make an automatic Bluetooth connection?

schosdas — Mon, 21 Sep 2020 13:13:35 GMT

Thank you! I will refer to it and test it.

RE: How can I make an automatic Bluetooth connection?

Kenneth — Mon, 21 Sep 2020 09:53:59 GMT

Hi,

Advertising is typically is configured by calling ble_advertising_init() and started by calling ble_advertising_start(). When calling ble_advertising_init() you can configure it to advertise on disconnect by:

init.config.ble_adv_on_disconnect_disabled = false;

Best regards,
Kenneth