Error in "is_UUID_present"

Question

Hi! 
 I want to connect a nrf51 dk with a beacon and I'm using the UUID to make the connection. In the beacon code I define the UUID in this way: 
 ble_uuid_t adv_uuids[] = {{BCS_UUID_SERVICE, m_bcs.uuid_type}};
ble_uuid_t m_adv_uuids[]= {BLE_UUID_OUR_SERVICE_UUID,BLE_UUID_TYPE_VENDOR_BEGIN}; //aggiunta da noi
// Build and set advertising data
memset(&advdata, 0, sizeof(advdata));
advdata.name_type = BLE_ADVDATA_FULL_NAME;
advdata.include_appearance = true;
advdata.flags.size = sizeof(flags);
advdata.flags.p_data = &flags;

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;

err_code = ble_advdata_set(&advdata, &scanrsp);
APP_ERROR_CHECK(err_code);
 
 In the nrf51 I use the function is_UUID_present and I get the error NRF_ERROR_NOT_FOUND (for a 128bit UUID no match in the populated table of UUIDs ) and the code that I use is 
 else if ( (field_type == BLE_GAP_AD_TYPE_128BIT_SERVICE_UUID_MORE_AVAILABLE)
 || (field_type == BLE_GAP_AD_TYPE_128BIT_SERVICE_UUID_COMPLETE)
 )
{
 
 err_code = sd_ble_uuid_decode(UUID128_SIZE, 
 &p_data[index + 2], 
 &extracted_uuid);
 if (err_code == NRF_SUCCESS)
 { 
 if ((extracted_uuid.uuid == p_target_uuid->uuid)
 && (extracted_uuid.type == p_target_uuid->type))
 {
 return true;
 }
 }
 
}
 
 Can someone explain me why this happens? Thank you so much!
 projects.rar

MartinBL · Accepted Answer

Hi, 
 I think the problem is on the central side. Since you are using is_uuid_present() I assume that you base your code on the ble_app_uart_c example? You need to add your beacon base UUID with its 16-bit service UUID to the table of UUIDs in ble_nus_c_init() located in ble_nus_c.c. The method is almost identical to the method used in the tutorial. 
 EDIT 1: 
Modify ble_nus_c_init() to look like this: 
 uint32_t ble_nus_c_init(ble_nus_c_t * p_ble_nus_c, ble_nus_c_init_t * p_ble_nus_c_init)
{
 uint32_t err_code;
 ble_uuid_t uart_uuid;
 ble_uuid128_t nus_base_uuid = BLE_UUID_OUR_BASE_UUID; // NORDIC: Use our base UUID instead
 
 VERIFY_PARAM_NOT_NULL(p_ble_nus_c);
 VERIFY_PARAM_NOT_NULL(p_ble_nus_c_init);
 
 err_code = sd_ble_uuid_vs_add(&nus_base_uuid, &p_ble_nus_c->uuid_type);
 VERIFY_SUCCESS(err_code);
 
 uart_uuid.type = p_ble_nus_c->uuid_type;
 uart_uuid.uuid = BLE_UUID_OUR_SERVICE; // NORDIC: Use our service UUID instead
 
 p_ble_nus_c->conn_handle = BLE_CONN_HANDLE_INVALID;
 p_ble_nus_c->evt_handler = p_ble_nus_c_init->evt_handler;
 p_ble_nus_c->handles.nus_rx_handle = BLE_GATT_HANDLE_INVALID;
 p_ble_nus_c->handles.nus_tx_handle = BLE_GATT_HANDLE_INVALID;
 
 return ble_db_discovery_evt_register(&uart_uuid);
}
 
 You also need to modify the static const ble_uuid_t m_nus_uuid variable located almost at the top of main.c: 
 static const ble_uuid_t m_nus_uuid = 
{
 .uuid = BLE_UUID_OUR_SERVICE,
 .type = BLE_UUID_TYPE_VENDOR_BEGIN
};
 
 EDIT 2: Modified ble_app_uart_c example that works with finished service tutorial code: 77683-ble_app_uart_c 
 EDIT 3: Example is for SDK 11. Search for "// NORDIC" to see what I have modified. 
 EDIT 4: I have looked at your code and I think I have found the issue. After I compiled and ran your beacon code I could see that you are not advertising the the correct vendor specific UUID. You have actually placed the DFU UUID in your scan response, not the BLE_UUID_OUR_BASE_UUID. The root cause is found in advertising_init() and services_init() in the Beacon project. In services_init() you initiate three services; dfu, bcs, and our service. All three services add a 128-bit UUID to the table of UUIDs in the BLE stack, and BLE_UUID_OUR_BASE_UUID is the third UUID to be added to the table. So the solution is simply to change this line in advertising_init() : 
 ble_uuid_t m_adv_uuids[]= {BLE_UUID_OUR_SERVICE,BLE_UUID_TYPE_VENDOR_BEGIN};
 
 to this: 
 ble_uuid_t m_adv_uuids[]= {BLE_UUID_OUR_SERVICE,BLE_UUID_TYPE_VENDOR_BEGIN + 2};
 
 then you will put the third 128-bit UUID into your scan response packet. That was the only change I had to make to get your code working (after altering the ble_nus_c.c file as above of course).