https://devzone.nordicsemi.com/f/nordic-q-a/69850/pca10056-led5-blink-fast-when-jlinkrttclient-is-connectedHi all, I&#39;m starting a project with a nRF52840, and start protoyping with pca10056 board. I started with compiling ble_app_blinky example app, with armgcc. I can compile it, and flash it using make flash directive, without issue. App is runningen-USTelligent Community 13Wed, 23 Dec 2020 18:46:05 GMThttps://devzone.nordicsemi.com/thread/286513?ContentTypeID=1Wed, 23 Dec 2020 18:46:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:336f99ef-aace-4c6f-ad7f-bf31f93cb8e1vbelloir<p>OK, found the solution.<br />RTT should be enabled changing this line in sdk_config.h from</p> <blockquote> <p>#define NRF_LOG_BACKEND_RTT_ENABLED 0</p> </blockquote> <p>to</p> <blockquote> <p>#define NRF_LOG_BACKEND_RTT_ENABLED 1</p> <p>Sorry for that question<code></code></p> <p><code></code></p> </blockquote><div style="clear:both;"></div>