https://devzone.nordicsemi.com/f/nordic-q-a/8623/creating-custom-service-and-characteristics-with-bluetooth-base-uuidHi, I am creating a custom service and corresponding characteristic. For that I am planning to use bluetooth base uuid (for confirmation : 0000 0000 -0000-1000-8000-00805F9B34FB). I used following settings for the service: In structure ble_uuid_t : en-USTelligent Community 13Mon, 10 Aug 2015 13:26:04 GMThttps://devzone.nordicsemi.com/thread/31546?ContentTypeID=1Mon, 10 Aug 2015 13:26:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cc5ae8ac-c79a-4638-a954-c4a7fc6f6a52Petter Myhre<p>I just tested this, and if I only change the UUID to 0xccc0 and 0xccc1 both returns NRF_SUCCESS. I guess there is something else that is causing the error returned from sd_ble_gatts_characteristic_add(). What is the error code?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/31548?ContentTypeID=1Mon, 10 Aug 2015 12:19:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:27f135f4-ac19-47b4-953b-c565c1338ae2akhil<p>@Petter Myhre , oh, but what could be the reason that the service registration function become successful?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/31547?ContentTypeID=1Sat, 08 Aug 2015 10:21:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:04085046-9b66-42d4-80a4-4af6cf7a6bf0Petter Myhre<p>For custom services and characteristics you can&#39;t use the Bluetooth SIG base UUID. The Bluetooth SIG base UUID can only be used with <a href="https://developer.bluetooth.org/gatt/services/Pages/ServicesHome.aspx">these</a> services.</p> <p>See <a href="https://devzone.nordicsemi.com/question/39043/how-to-acquire-a-vendor-base-uuid/">this</a> question for how to acquire a UUID for your custom services and characteristics.</p><div style="clear:both;"></div>