https://devzone.nordicsemi.com/f/nordic-q-a/39232/why-can-t-i-add-custom-uuidHi, I&#39;m trying to test adding my own custom service, but have errors when I tried to add a 128bit UUID, the test code is simple, in the service_init() function, I just added the following codes: ble_uuid128_t service_uuid = {{0x68, 0x26, 0xed, 0x42en-USTelligent Community 13Mon, 08 Oct 2018 08:11:13 GMThttps://devzone.nordicsemi.com/thread/151977?ContentTypeID=1Mon, 08 Oct 2018 08:11:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:759eada7-4778-4e76-8926-70b4119a7c96MartinBL<p>Hi,</p> <p>This is a quite common problem and there are lots of <a href="https://devzone.nordicsemi.com/search?q=vs%20uuid%20NRF_ERROR_NO_MEM#serpgroup=1&amp;serpdate=past_year">threads about it already here on devzone</a>. I&#39;m guessing that you have to <span><a href="https://devzone.nordicsemi.com/f/nordic-q-a/27806/the-function-sd_ble_uuid_vs_add-gives-error-4-nrf_error_no_mem-no-memory-for-operation/109665#109665">increase NRF_SDH_BLE_VS_UUID_COUNT in sdk_config.h</a>.</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/151899?ContentTypeID=1Sat, 06 Oct 2018 12:03:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:52920c69-ca88-411d-8ec4-ac9a064c4cf0jj8431<p>I found if I use the <strong>ble_app_uart</strong> example as the base and replace the adding custome UUID part with my above code, then no error is returned, so what is the difference?&nbsp;</p> <p>Is there something missed in the&nbsp;<span><strong>ble_app_template</strong> ?</span></p><div style="clear:both;"></div>