https://devzone.nordicsemi.com/f/nordic-q-a/119394/how-to-control-cmux-on-nrf9151-dkHi everybody I&#39;m trying to modify the Zephyr serial LTE modem example so that CMUX can be controlled using another communication interface, specifically I&#39;m imagining UART1 (basically I don&#39;t care if it&#39;s UART1, UART2, etc.). The idea is thaten-USTelligent Community 13Sun, 16 Mar 2025 22:07:18 GMThttps://devzone.nordicsemi.com/thread/527484?ContentTypeID=1Sun, 16 Mar 2025 22:07:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:440d3f0b-ebe2-439b-aaa3-23a6dbdb322bSigurd<p>Hi!</p> [quote user=""]The idea is that I will switch the modem to PPP mode, but in the event that I need to leave this mode, I am not able to implement it, because in PPP mode the modem does not respond to AT commands.[/quote] <p>What do you mean by &quot;not able to implement it&quot;? You can switch off PPP mode with&nbsp;<span>AT#XPPP=0 , send your AT commands, and if you want to enable PPP mode again, use&nbsp;AT#XPPP=1&nbsp;</span></p><div style="clear:both;"></div>