https://devzone.nordicsemi.com/f/nordic-q-a/5110/add-characteristic-to-existing-serviceI have the PCA 10028 Board. I would like to add a characteristic on an already existing service. In the nAN-36 I see, what is necessary to set up service and characteristic. In the LED Button application example there is one service with two characteristicsen-USTelligent Community 13Fri, 16 Jan 2015 09:17:53 GMThttps://devzone.nordicsemi.com/thread/17963?ContentTypeID=1Fri, 16 Jan 2015 09:17:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9a1a14c0-3b16-4e46-b37c-d921ff12a43bInspectron<p>Thank you! With your help I solved the problem. The initalization of the write handler was missing. Not it appears in the nRF Master Control Panel.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/17962?ContentTypeID=1Wed, 14 Jan 2015 10:10:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cd64723b-57ec-43cd-98f2-489f03ff6445Stefan Birnir Sverrisson<p>Hi</p> <p>There is a different version for the ble_app_lbs available <a href="https://devzone.nordicsemi.com/question/19055/set-gpio-over-button-click/?answer=20957#post-id-20957">here</a> which contains two leds and two buttons. Perhaps you can take a look at that to see if you can spot something that is missing in your code. It is implemented for SDK 5.2.0 but the added code for the extra characteristics should be also be valid for more recent SDK&#39;s. To see exactly what is added to the code, you could compare the code with the original <a href="https://github.com/NordicSemiconductor/nrf51-ble-app-lbs/tree/5.2.0">ble_app_lbs code on the SDK 5.2.0 branch</a>.</p><div style="clear:both;"></div>