https://devzone.nordicsemi.com/f/nordic-q-a/102978/how-to-configure-modem-on-custom-nrf9160-pcbHi, using the nrf9160dk I can get an LTE-M connection and MQTT service (SW based on cellular fundamentals course examples). The same firmware on our custom PCB will not connect to LTE-M network. I assume I have to update device ID in custom PCB anden-USTelligent Community 13Thu, 24 Aug 2023 12:30:23 GMThttps://devzone.nordicsemi.com/thread/442974?ContentTypeID=1Thu, 24 Aug 2023 12:30:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ff6f7ada-785d-4f8b-bbb5-73e8657dd394DunKCubik<p>Hi Michal,</p> <p>&nbsp; &nbsp; thanks for your reply.&nbsp;</p> <p>I managed to find the problem. Our custom PCB has the option for eSIM or regular SIM and it was defaulting to eSIM. Solved! thank you.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/442354?ContentTypeID=1Mon, 21 Aug 2023 14:28:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1598925a-5fe8-4c47-839d-0d2a8bb6d742Michal<p>Hello Duncan,</p> <p>I know that our <a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.4.1/nrf/samples/nrf9160/modem_shell/README.html#segger-rtt-support">modem shell</a> supports RTT. You may want to look into that.</p> <p>If that is possible hardware-wise, you could also have a some kind of production test image with <a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/libraries/modem/at_host.html">AT host library</a> that redirects one of the UARTs to some unused pins and then do all the configuration that way before flashing the production image.</p> <p>Best regards,</p> <p>Michal</p><div style="clear:both;"></div>