https://devzone.nordicsemi.com/f/nordic-q-a/59069/segger-studio-with-9160I started with the mqtt_simple example. I added: #CONFIG_MQTT_PASSWORD=&quot;pass&quot; #CONFIG_MQTT_USERNAME=&quot;David&quot; to the prj.conf file. Relaunched the project which rebuild the generated file configs.c. When I look at the newly generated file, theseen-USTelligent Community 13Fri, 13 Mar 2020 14:20:34 GMThttps://devzone.nordicsemi.com/thread/239763?ContentTypeID=1Fri, 13 Mar 2020 14:20:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:062cdfdb-dcba-46e9-b0d9-ad50b650ad0em9th<p>Good information to know.</p> <p>Actually turned out the problem was that they weren&#39;t defined in Kconfig.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/239751?ContentTypeID=1Fri, 13 Mar 2020 13:53:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5626e53a-beab-4f40-ad58-5c97401f70e3Sigurd<p>Hi,</p> [quote userid="78282" url="~/f/nordic-q-a/59069/segger-studio-with-9160"]#CONFIG_MQTT_PASSWORD=&quot;pass&quot;<br />#CONFIG_MQTT_USERNAME=&quot;David&quot;[/quote] <p>The prefix&nbsp;<span style="font-family:monospace;">#</span>&nbsp;is used to comment out configs. You need to remove the # for them to get applied.</p><div style="clear:both;"></div>