creating custom service and characteristics with Bluetooth Base UUID.

Question

Hi, 
 
 Am using nrf51822 uint32_t ble_nus_c_init(ble_nus_c_t * p_ble_nus_c, ble_nus_c_init_t * p_ble_nus_c_init)
{

 // for RN_4871
 uint32_t err_code;
 ble_uuid_t uart_uuid;
 ble_uuid128_t nus_base_uuid = NUS_BASE_UUID;

 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_NUS_SERVICE;
	
	
 ble_uuid128_t char1_base_uuid = CHAR1_BASE_UUID;

 err_code = sd_ble_uuid_vs_add(&char1_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_NUS_TX_CHARACTERISTIC;


 ble_uuid128_t char2_base_uuid = CHAR2_BASE_UUID;

 err_code = sd_ble_uuid_vs_add(&char2_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_NUS_RX_CHARACTERISTIC;

 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;
 
 return ble_db_discovery_evt_register(&uart_uuid);
} a central, i want to discover the service of anothe rble module (which is RN4871 from microship). 
 My problem here is that this RN4871 advertise a service with a different base UUID for service and for its two characteristics. 
 Am not able to discover this service, although i tried to use the fucntion sd_ble_uuid_vs_add(.....) more then one time, first time for service and two times for each characteristic. 
 after each use of "sd_ble_uuid_vs_add" a VERIFY_SUCCESS(err_code); is used, but is stucks after the first use of sd_ble_uuid_vs_add(). 
 PS1 : the bases are : 
 #define NUS_BASE_UUID {{0x55, 0xE4, 0x05, 0xD2, 0xAF, 0x9F, 0xA9, 0x8F, 0xE5, 0x4A, 0x7D, 0xFE, 0x43, 0x53, 0x53, 0x49}} //Used vendor specific UUID. #define CHAR1_BASE_UUID {{0x16, 0x96, 0x24, 0x47, 0xC6, 0x23, 0x61, 0xBA, 0xD9, 0x4B, 0x4D, 0x1E, 0x43, 0x53, 0x53, 0x49}} // Used vendor specific UUID. #define CHAR2_BASE_UUID {{0xB3, 0x9B, 0x72, 0x34, 0xBE, 0xEC, 0xD4, 0xA8, 0xF4, 0x43, 0x41, 0x88, 0x43, 0x53, 0x53, 0x49}} // Used vendor specific UUID. 
 #define BLE_UUID_NUS_SERVICE 0x5343 // The UUID of the Nordic UART Service. #define BLE_UUID_NUS_TX_CHARACTERISTIC 0x5343 // The UUID of the Characteristic1. #define BLE_UUID_NUS_RX_CHARACTERISTIC 0x5344 // The UUID of the Characteristic2. 
 PS2: i adjusted the RAM. 
 PS3: i adjusted the uuid count with : p_ble_enable_params->common_enable_params.vs_uuid_count = 3 in function ble_stack_init(void) since am using SDk 12.3.0 ( don't has NRF_SDH_BLE_VS_UUID_COUNT in it's sdk_config.h) 
 
 would you help me please. 
 Thnks in advance

Einar Thorsrud · Accepted Answer

Your changes to ble_nus_c.h seems sensible. This also worked when I tested on my side. Perhaps the issue is with how you configured support for more UUIDs? 
 Referring to the NUS central sample in SDK 12.3 I did this minor change to main.c to make it work, 
 diff --git a/examples/ble_central/ble_app_uart_c/main.c b/examples/ble_central/ble_app_uart_c/main.c
index ca13f2a..55bf742 100644
--- a/examples/ble_central/ble_app_uart_c/main.c
+++ b/examples/ble_central/ble_app_uart_c/main.c
@@ -494,6 +494,8 @@ static void ble_stack_init(void)
 PERIPHERAL_LINK_COUNT,
 &ble_enable_params);
 APP_ERROR_CHECK(err_code);
+ 
+ ble_enable_params.common_enable_params.vs_uuid_count = 3;
 
 //Check the ram settings against the used number of links
 CHECK_RAM_START_ADDR(CENTRAL_LINK_COUNT,PERIPHERAL_LINK_COUNT);
 
 And in the Keil project I configure the IRAM1 start address to 0x20002800 and size to 0x1800 (could perhaps be optimized).

creating custom service and characteristics with Bluetooth Base UUID.

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