https://devzone.nordicsemi.com/f/nordic-q-a/59691/rtt-viewer-not-always-showing-all-hex-stringsRTT is a very strange beast. It looks that, depending the printed binary content, the output in the viewer can be displayed - or not. It seems that the rtt viewer acts on some byte sequences. I attached 2 pictures. Picture 1 seems to print nothing afteren-USTelligent Community 13Tue, 31 Mar 2020 14:42:01 GMThttps://devzone.nordicsemi.com/thread/242744?ContentTypeID=1Tue, 31 Mar 2020 14:42:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:86c16b52-c460-4d4e-b494-d91df203f5efWim<p>Hi Edvin,</p> <p>you are right, it is the viewer itself. I set up&nbsp;JLinkExe /&nbsp;JLinkRTTClient (telnet) which&nbsp;works perfectly.</p> <p>Thanks,</p> <p>Wim</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/242696?ContentTypeID=1Tue, 31 Mar 2020 12:29:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6e4400d6-5feb-419e-bfa1-67b68f9e99edEdvin<p>Hello,</p> <p>This is probably not related to the nRF, but rather Segger&#39;s RTT Viewer?</p> <p>It may be that for some reason, you are logging with text color (=black)? Is that the case?</p> <p>In your sdk_config.h file, what is&nbsp;NRF_LOG_USES_COLORS defined as?&nbsp;</p> <p>Have you tried using Segger Embedded Studio, and monitor the log there? Does the lines sometime disappear there as well?&nbsp;</p><div style="clear:both;"></div>