128 bit UUID's

[Yalcin Akdogan]

Hi,

Function call to > err_code = ble_advdata_set(&advdata, NULL);

returns always err_code = 7 (NRF_ERROR_INVALID_PARAMETER) for a 128 bit UUID type (BLE_UUID_TYPE_VENDOR_BEGIN).

For 16 bit UUID types it works fine. Here is the code:

#define UUID_128       1

static void advertising_init(void)
{
    uint32_t      err_code;
    ble_advdata_t advdata;
    uint8_t       flags = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;

    ble_uuid_t adv_uuids[] =
    {
#ifdef UUID_128
    	{BLE_UUID_ANCS_SERVICE,          BLE_UUID_TYPE_VENDOR_BEGIN},
#else
    	{BLE_UUID_ANCS_SERVICE,          BLE_UUID_TYPE_BLE},
#endif
    };

    // Build and set advertising data
    memset(&advdata, 0, sizeof(advdata));

    advdata.name_type               = BLE_ADVDATA_NO_NAME;
    advdata.include_appearance      = true;
    advdata.flags.size              = sizeof(flags);
    advdata.flags.p_data            = &flags;
    advdata.uuids_complete.uuid_cnt = sizeof(adv_uuids) / sizeof(adv_uuids[0]);
    advdata.uuids_complete.p_uuids  = adv_uuids;

    err_code = ble_advdata_set(&advdata, NULL);

    sprintf(BUFFER, "err_code := %d in %s \n\r", (int)err_code, __FUNCTION__);
    DEBUGF(BUFFER);
    APP_ERROR_CHECK(err_code);

    // Initialise advertising parameters (used when starting advertising)
    memset(&m_adv_params, 0, sizeof(m_adv_params));
    
    m_adv_params.type        = BLE_GAP_ADV_TYPE_ADV_IND;
    m_adv_params.p_peer_addr = NULL;                           // Undirected advertisement
    m_adv_params.fp          = BLE_GAP_ADV_FP_ANY;
    m_adv_params.interval    = APP_ADV_INTERVAL;
    m_adv_params.timeout     = APP_ADV_TIMEOUT_IN_SECONDS;
}

questions:

• what I am doing wrong?
• documentation says octets 12-13 to use from 128 bit UUID. does it count by starting at 0?

Yalcin

[Ole Morten]

It seems you haven't added your custom base correctly. I just posted this question and answer to properly explain how to add a base. If you follow this scheme, you must pass the type sd_ble_uuid_vs_add() retured instead of BLE_UUID_TYPE_VENDOR_BEGIN. If not, the softdevice will not be able to find out which base UUID should be used, and hence return an error.

Note that you must also make sure that sd_ble_uuid_vs_add() is called before you set up the advertisement package. This most likely means that you should have your services_init() before your advertising_init() in main().

[Jim Credland]

This is really badly documented. You could usefully move this post to the bit that says 'Detailed Description' here: devzone.nordicsemi.com/.../group___b_l_e___u_u_i_d___t_y_p_e_s.html (and in similar locations for other SDK versions!)