ADD UUID 128 custom service to advertising packet

[annapalu]

Hi all,

is there an example to add the uuid 128 of a custom service on advertising data?

[Jørgen Holmefjord]

Hi,

The BLE UART example shows how to add a custom UUID to the scan response data. You can also find a detailed explanation of how you do this in the BLE Services, a beginner's tutorial. Note that you can add it to the advertising data if you have enough available space, but the maximum payload of one advertising packet is 27 bytes.

Best regards,

Jørgen

[annapalu]

Hi jorgen,

thanks for the answer. i see the uart example, it's very simple.

static ble_uuid_t                       m_adv_uuids[] = {{BLE_UUID_NUS_SERVICE, NUS_SERVICE_UUID_TYPE}};  

/**< Universally unique service identifier. */

/**@brief Function for initializing the Advertising functionality.
 */

static void advertising_init(void)
{
    uint32_t               err_code;
    ble_advdata_t          advdata;
    ble_advdata_t          scanrsp;
    ble_adv_modes_config_t options;

// Build advertising data struct to pass into @ref ble_advertising_init.
memset(&advdata, 0, sizeof(advdata));
advdata.name_type          = BLE_ADVDATA_FULL_NAME;
advdata.include_appearance = false;
advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;

memset(&scanrsp, 0, sizeof(scanrsp));
scanrsp.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
scanrsp.uuids_complete.p_uuids  = m_adv_uuids;

memset(&options, 0, sizeof(options));
options.ble_adv_fast_enabled  = true;
options.ble_adv_fast_interval = APP_ADV_INTERVAL;
options.ble_adv_fast_timeout  = APP_ADV_TIMEOUT_IN_SECONDS;

err_code = ble_advertising_init(&advdata, &scanrsp, &options, on_adv_evt, NULL);
APP_ERROR_CHECK(err_code);

}

my problem is the define of BLE_UUID_NUS_SERVICE is not simple 0xXXXX but it's somethink like that

ble_uuid128_t bds_base_uuid = {{0xB6, 0x9D, 0x21, 0x57, 0xA7, 0xA3, 0xFA, 0xA0, 0x97, 0x4A, 0x72, 0xA7, 0x00, 0x00, 0x20, 0xF3}};

and i don't know how meange it

[Jørgen Holmefjord]

The BLE UART UUID is also 128 bit. This is described in this thread.

[annapalu]

thx, very helpful. For use a UIID 128 i set the advdata.include_appearance = false; because the size is limited. I think that is not a problem- But i would understand what means.

Thanks, Anna

[Jørgen Holmefjord]

Appearance allows you device to appear as a predefined type for your computer/phone etc. when scanning for Bluetooth devices. Some more information can be found here and here. It is no problem to turn this off if you do not require this feature.