Custom service is advertised with NUS base UUID

RE: Custom service is advertised with NUS base UUID

Einar Thorsrud — Thu, 11 Apr 2024 12:59:16 GMT

That is good to hear. Thanks for letting me know it worked 🙂

RE: Custom service is advertised with NUS base UUID

masterLee — Thu, 11 Apr 2024 12:42:59 GMT

Yes you are right! It worked! Great! Thank you for your support!!

RE: Custom service is advertised with NUS base UUID

Einar Thorsrud — Thu, 11 Apr 2024 12:35:56 GMT

[quote user="masterLee"]I haven't changed something else in the code. Only the parts I mentioned before.[/quote]

Then you are still using the wrong base for your custom service, and that needs to be updated. NUS_SERVICE_UUID_TYPE is defined to BLE_UUID_TYPE_VENDOR_BEGIN, which is 2. So with this snippet you are using the same base as NUS:

static ble_uuid_t m_adv_uuids[]   =                                  
{
   {BLE_UUID_NUS_SERVICE, NUS_SERVICE_UUID_TYPE},
   {BLE_UUID_BATTERY_SERVICE, BLE_UUID_TYPE_BLE},
   {CUSTOM_SERVICE_UUID, BLE_UUID_TYPE_VENDOR_BEGIN}
};

You should use BLE_UUID_TYPE_VENDOR_BEGIN+1 instead (you can define it to something sensible, like is done in the SDK for NUS_SERVICE_UUID_TYPE if you like). Note that te way this is done, the order matters as mentionned before, but that is not a big problem.

RE: Custom service is advertised with NUS base UUID

masterLee — Thu, 11 Apr 2024 11:12:59 GMT

I haven't changed something else in the code. Only the parts I mentioned before.

How do I update the type where you add the service to the advertising packet?

Also, I noticed that when I place the last code part before NUS initialization, both services , NUS and custom service get the UUID of the custom service ...

RE: Custom service is advertised with NUS base UUID

Einar Thorsrud — Thu, 11 Apr 2024 10:26:47 GMT

This looks OK with regards to how the service is added to the GATT table. But did you make sure to also update the type where you add the service to the advertising packet? Can you show the updated code you have for that?

RE: Custom service is advertised with NUS base UUID

masterLee — Thu, 11 Apr 2024 10:07:50 GMT

Update: I added the following code in services_init(), in sdk_config I set NRF_SDH_BLE_VS_UUID_CNT to 2 and updated the ram size but the result is the same again.

    ret_code_t  err_code;
    ble_uuid_t ble_uuid;
    uint16_t service_handle;
    uint8_t  uuid_type = 0;

    ble_uuid128_t base_uuid = CUSTOM_UUID_BASE;
    err_code = sd_ble_uuid_vs_add(&base_uuid, &uuid_type);
    if (err_code != NRF_SUCCESS) {
      NRF_LOG_INFO("CUSTOM SERVICE ERROR %X| UUID TYPE: %X",err_code ,uuid_type);
    }
    NRF_LOG_INFO(" UUID TYPE: %X",uuid_type);  // returns 3

    ble_uuid.type = uuid_type;
    ble_uuid.uuid = CUSTOM_SERVICE_UUID;   //0x1523

    // Add the service.
    err_code = sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY,
                                        &ble_uuid,
                                        &service_handle);
   
    if (err_code != NRF_SUCCESS) {
        NRF_LOG_INFO("CUSTOM SERVICE ERROR %X| SERVICE HANDLE: %X",err_code ,service_handle);
    }
    NRF_LOG_INFO("SERVICE HANDLE: %X",service_handle); //returns 11

RE: Custom service is advertised with NUS base UUID

masterLee — Thu, 11 Apr 2024 09:10:22 GMT

Ok I will try it out and I will respond

RE: Custom service is advertised with NUS base UUID

Einar Thorsrud — Thu, 11 Apr 2024 09:05:20 GMT

Hi,

In order to get the correct base UUID you need to register it with sd_ble_uuid_vs_add(). And when you do, the second parameter is an output, and this is the type you need to use when you subsequently refer to it (this is a counter though, so if the base used by NUS is added first this will be 2 (BLE_UUID_TYPE_VENDOR_BEGIN), and your will be 3, so you can use this as well, but then things will break if the order you register the base addresses change).