How update Advertising Data in SDK 16.0.0?

[Yeyzz]

Hello everyone i need to update the Advertising Data of the device but i am not sure the correct way to do it.

First i have the next struct of the Adv Data that i want to use:

typedef struct {
    uint8_t model;
    uint16_t device_id;
    uint8_t led_r;
    uint8_t led_g;
    uint8_t led_b;
} device_adv_data_t;

The model and device_id are const values, but led params could change on execution time and i want to update the Advertising data with the new values. Right now i initialize the params using the example approach:

device_adv_data_t test_adv_data = {
    .device_id = DEVICE_ID_NUMBER,
    .model = DEVICE_MODEL_NUMBER,
    led_r = DEFAULT_R_COLOR,
    led_g = DEFAULT_G_COLOR,
    led_b = DEFAULT_B_COLOR
};

static void advertising_init(void)
{
    ret_code_t             err_code;
    ble_advertising_init_t init;

    memset(&init, 0, sizeof(init));
    
    static ble_uuid_t m_adv_uuids[] =                                              
    {   
        {SENSOR_UUID, BLE_UUID_TYPE_BLE} 
    };
    init.advdata.name_type               = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance      = true;
    init.advdata.flags                   = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
    init.advdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    init.advdata.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;

    /* Here we add more advertising data for devices, (manufacturer data) with the
    struct ble_advdata_manuf_data_t s.*/

    ble_advdata_manuf_data_t manuf_data;
    manuf_data.company_identifier = BT_SIG_COMPANY_ID;
    manuf_data.data.size = sizeof(test_adv_data);
    manuf_data.data.p_data = (uint8_t*) &test_adv_data;
    init.advdata.p_manuf_specific_data = &manuf_data;
    
    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);
}

My doubt is, if I update my test_adv_data struct, the adv data will automatically update when restart it since i pass the pointer to that struct? Or i have to do extra steps? 


Thanks to everyone. 

[Edvin]

Hello,

The SoftDevice holds it's own copy of the advertising data, so updating the test_adv_data struct alone doesn't update the advertising data.

I usually just say that you can stop, re-initialize the advertising data (just like you did the first time), and then restart it, but since some SDK update (prior to SDK16) we added ble_advertising_advdata_update(), which I believe you can use to update the advertising data on the fly. I have not tested it personally, but it is implemented in ble_advertising.c (same file that has ble_advertising_init()).

According to the declaration in ble_advertising.h: "This function can be called if you wish to reconfigure the advertising data The update
* will be effective even if advertising has already been started."

Best regards,

Edvin