When 128bit characteristic UUID is different form 128bit service UUID，how to discovery it?

Question

I have the same problem as how to discovery 128bit characteristic UUID which is totally different form 128bit service UUID ，the uuid in this question is the same with me,but I can not find solution . 
 
 I modified the ble_nus_c_init() like this: 
 #define BASE_UUID {{0xfb,0x34,0x9b,0x5f,0x80,0x00,0x00,0x80,0x00,0x10,0x00,0x00,0x00,0x00,0x00,0x00}}
#define BASE_UUID_FEE9 {{0xfb,0x34,0x9b,0x5f,0x80,0x00,0x00,0x80,0x00,0x10,0x00,0x00,0xe9,0xfe,0x00,0x00}}
#define BASE_UUID_CHAR_RX {{0x00,0x96,0x12,0x16,0x54,0x92,0x75,0xb5,0xa2,0x45,0xfd,0xab,0x39,0xc4,0x4b,0xd4}}
#define BASE_UUID_CHAR_TX {{0x01,0x96,0x12,0x16,0x54,0x92,0x75,0xb5,0xa2,0x45,0xfd,0xab,0x39,0xc4,0x4b,0xd4}}


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_uuid1,ble_uuid2;
 ble_uuid128_t nus_base_uuid =BASE_UUID; //NUS_BASE_UUID;
 ble_uuid128_t base_uuid1 = BASE_UUID_CHAR_RX;
 ble_uuid128_t base_uuid2 = BASE_UUID_CHAR_TX;
 
 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 = 0xfee9; //BLE_UUID_NUS_SERVICE;

 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_tx_handle = BLE_GATT_HANDLE_INVALID;
 p_ble_nus_c->handles.nus_rx_handle = BLE_GATT_HANDLE_INVALID;

 ble_db_discovery_evt_register(&uart_uuid);
 
 ble_uuid1.uuid = 0; 
 err_code = sd_ble_uuid_vs_add(&base_uuid1, &ble_uuid1.type);
 VERIFY_SUCCESS(err_code);

 ble_uuid2.uuid = 0; 
 err_code = sd_ble_uuid_vs_add(&base_uuid2, &ble_uuid2.type);
 VERIFY_SUCCESS(err_code);

 err_code=ble_db_discovery_evt_register(&ble_uuid1);
 err_code=ble_db_discovery_evt_register(&ble_uuid2);
 return err_code;
} 
 And I set NRF_SDH_BLE_VS_UUID_COUNT to 4 , modified the ram start and size. 
 I can't receive the event BLE_DB_DISCOVERY_COMPLETE, but receive event BLE_DB_DISCOVERY_ERROR and BLE_DB_DISCOVERY_SRV_NOT_FOUND 
 When I change 0xFEE9 to 0xFEE8 I can receive the event BLE_DB_DISCOVERY_COMPLETE,but characteristic.uuid.uuid = 0x00 I don't know why. 
 How to discovery 128bit characteristic UUID which is totally different form 128bit service UUID? 
 Can someone help me? 
 NRF52832 SDK14.2 code base "on ble_app_uart_c" pca10040 s132 
 Thanks.

Andy · Answer

This is what you need, modify it as you see fit: 
 In your init function: 
 ble_uuid128_t your_service_base_uuid = YOUR_SERVICE_BASE_UUID;
ble_uuid128_t your_characteristic_base_uuid = YOUR_CHARACTERISTIC_BASE_UUID;
APP_ERROR_CHECK(sd_ble_uuid_vs_add(&your_service_base_uuid, &your_service.type));
APP_ERROR_CHECK(sd_ble_uuid_vs_add(&your_characteristic_base_uuid, &your_characteristic.type));

your_service.uuid = BLE_UUID_YOUR_SERVICE;
your_characteristic.uuid = BLE_UUID_YOUR_CHARACTERISTIC;

APP_ERROR_CHECK(ble_db_discovery_evt_register(&your_service)); 
 In your db_evt_handler: 
 if (p_evt->evt_type == BLE_DB_DISCOVERY_COMPLETE) {
	if ((p_evt->params.discovered_db.srv_uuid.uuid == your_service.uuid) &&
 (p_evt->params.discovered_db.srv_uuid.type == your_service.type)) {
 for (uint8_t i = 0; i < p_evt->params.discovered_db.char_count; i++) {
 if (p_evt->params.discovered_db.charateristics[i].characteristic.uuid.type == your_characteristic.type) {
 if (p_evt->params.discovered_db.charateristics[i].characteristic.uuid.uuid == your_characteristic.uuid) {
 cccd_handle = p_evt->params.discovered_db.charateristics[i].cccd_handle;
 value_handle = p_evt->params.discovered_db.charateristics[i].characteristic.handle_value;
 }
 }
 }
	}
} 
 That should work. If it doesn't, my bet is that your calls to ble_db_discovery_evt_register are returning errors. Check the return codes of those functions to verify that they are returning NRF_SUCCESS.