https://devzone.nordicsemi.com/f/nordic-q-a/33236/52840-dtmDear Nordic Engineer, I am working on sdk15,52840,ble app uart project, i saw BLE_DTM_ENABLED in sdk config. // &lt;q&gt; BLE_DTM_ENABLED - ble_dtm - Module for testing RF/PHY using DTM commands #ifndef BLE_DTM_ENABLED #define BLE_DTM_ENABLED 1 #endifen-USTelligent Community 13Tue, 10 Apr 2018 12:41:03 GMThttps://devzone.nordicsemi.com/thread/127619?ContentTypeID=1Tue, 10 Apr 2018 12:41:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e8777c0a-6e51-4822-8982-e7d2efa1c498H&#229;kon Alseth<p>Hi,</p> <p>&nbsp;</p> <p>The DTM project can be found in&nbsp;\examples\dtm\direct_test_mode, and since this example uses the radio peripheral, it cannot run while the softdevice is enabled.</p> <p>You need to disable the softdevice, then run the direct_test_mode application (you&#39;ll need to merge this project with your application) if your requirement is to add it alongside of your application.</p> <p>&nbsp;</p> <p>Best regards,</p> <p>Håkon</p> <p>&nbsp;</p><div style="clear:both;"></div>