https://devzone.nordicsemi.com/f/nordic-q-a/46385/sdk-12---custom-service-exampleHi, I am using Keil microVision5 with an nRF51-DK S130 and SDK 12. I followed the custom service tutorials in the link: https://devzone.nordicsemi.com/tutorials/b/bluetooth-low-energy/posts/ble-services-a-beginners-tutorial and found that theyen-USTelligent Community 13Tue, 23 Apr 2019 08:19:29 GMThttps://devzone.nordicsemi.com/thread/183024?ContentTypeID=1Tue, 23 Apr 2019 08:19:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4e50d1ff-c5f8-440a-94f2-32a09dc055b4ovrebekk<p>Hi Jack</p> <p>Sorry for the slow response, we had greatly reduced staff during the Easter holiday.&nbsp;</p> <p>There is an <a href="https://github.com/NordicPlayground/nrf51-ble-tutorial-service/tree/sdk11">SDK11 branch</a> in the repo that you can use for older SDK&#39;s. It might not work out of the box with SDK v12, but it should be much easier to adapt than the SDK v15 version.&nbsp;</p> <p>Please give it a try <span class="emoticon" data-url="https://devzone.nordicsemi.com/cfs-file/__key/system/emoji/1f642.svg" title="Slight smile">&#x1f642;</span></p> <p>Best regards<br />Torbjørn</p><div style="clear:both;"></div>