https://devzone.nordicsemi.com/f/nordic-q-a/124201/nordic-sdk-3-1-0-sample-adviceHello, I currently have a product using the nrf9160, that started development 4 or 5 years ago. The firmware uses SDK 1.6.1, and whilst I have had to correct some bugs in the SDK, it works fine. As a company, there has been some desire to updateen-USTelligent Community 13Mon, 08 Sep 2025 11:25:00 GMThttps://devzone.nordicsemi.com/thread/548047?ContentTypeID=1Mon, 08 Sep 2025 11:25:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9de6e1ed-e8bb-4071-859c-06c5f1e70524Benjamin<p>Hi Damien,</p> <p>Yes, there is an&nbsp;<a href="https://docs.zephyrproject.org/latest/connectivity/networking/api/mqtt.html">MQTT&nbsp;API</a>.&nbsp;<span>You don’t need to use SMF or ZBUS, though the MQTT sample demonstrates it that way.</span></p> <p>These samples should help you get going:<br /><br /><a href="https://github.com/nrfconnect/sdk-zephyr/tree/main/samples/net/mqtt_publisher">MQTT Publisher</a>&nbsp;(MQTT Sample without SMF and ZBUS)<br /><a href="https://github.com/nrfconnect/sdk-nrf/tree/main/samples/cellular/modem_callbacks">Modem Callbacks</a>&nbsp;(Simple Connection with Callbacks)<br /><a href="https://github.com/nrfconnect/sdk-zephyr/tree/main/samples/drivers/spi_flash">SPI Flash</a>&nbsp;(External SPI-NOR flash)<br /><br />I also highly recommend checking out our&nbsp;<a href="https://academy.nordicsemi.com/">Developer Academy</a>&nbsp;for great&nbsp;reading material and samples/exercises.<br /><br />Regards,<br />Benjamin</p><div style="clear:both;"></div>