RE: BLE "User Data" Service

vadim.barshaw — Fri, 14 Aug 2020 21:28:43 GMT

I know, it's been a while since the question was asked, but I've just happened to add user data service to my project.

static ble_gatts_char_handles_t fname_handles;
static ble_gatts_char_handles_t lname_handles;
uint16_t uds_handle;

static void add_userdata_service (void)
{
    ret_code_t      err_code;
    ble_uuid_t      ble_uuid;

    /* Add User Data Service */

    BLE_UUID_BLE_ASSIGN (ble_uuid, 0x181C);

    err_code = sd_ble_gatts_service_add (BLE_GATTS_SRVC_TYPE_PRIMARY,
                                         &ble_uuid,
                                         &uds_handle);
    APP_ERROR_CHECK (err_code);

    /* Add First Name characteristic */

    char * fname = "Vadim";
    ble_add_char_params_t fname_char_params = {
        .uuid               = 0x2A8A,
        .max_len            = strlen (fname),
        .init_len           = strlen (fname),
        .p_init_value       = (uint8_t *) fname,
        .char_props.read    = 1u,
        .read_access        = SEC_OPEN
    };

    err_code = characteristic_add (uds_handle,
                                   &fname_char_params,
                                   &fname_handles);
    APP_ERROR_CHECK (err_code);

    /* Add Last Name characteristic */

    char * lname = "Barshaw";
    ble_add_char_params_t lname_char_params = {
        .uuid               = 0x2A90,
        .max_len            = strlen (lname),
        .init_len           = strlen (lname),
        .p_init_value       = (uint8_t *) lname,
        .char_props.read    = 1u,
        .read_access        = SEC_OPEN
    };

    err_code = characteristic_add (uds_handle,
                                   &lname_char_params,
                                   &lname_handles);
    APP_ERROR_CHECK (err_code);
}

Hope this helps.

Vadim

RE: BLE "User Data" Service

Petter Myhre — Wed, 07 Dec 2016 10:00:24 GMT

We do not have an example that implements this service.

I'm not sure if we have something similar, but I would recommend starting with for example Heart Rate Application.