https://devzone.nordicsemi.com/f/nordic-q-a/74336/nrf52840---mqtt-with-tlsHi, I&#39;m working on a project with the nRF52840 PCA10056 board. Using the IoT LwIP MQTT example, I can communicate with the insecure MQTT. However, I need to provide security for this connection. I don&#39;t know where to add the ca certificate, server keyen-USTelligent Community 13Fri, 30 Apr 2021 15:33:59 GMThttps://devzone.nordicsemi.com/thread/307713?ContentTypeID=1Fri, 30 Apr 2021 15:33:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9080c09c-4d03-44b0-8a12-c2f5753edfc6Sigurd<p>Hi,</p> <p>If you are developing an IPv6-based application on a nRF52840, I would recommend the Thread protocol.</p> <p>nRF5- SDK:&nbsp;<a href="https://www.nordicsemi.com/Software-and-tools/Software/nRF5-SDK-for-Thread-and-Zigbee">https://www.nordicsemi.com/Software-and-tools/Software/nRF5-SDK-for-Thread-and-Zigbee</a></p> <p>nRF Connect SDK:&nbsp;<a href="http://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.5.1/nrf/ug_thread.html">http://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.5.1/nrf/ug_thread.html</a></p> <p>The nRF5 SDK IoT libraries was&nbsp;discontinued in the least nRF5 SDK version, nRF SDK 17.0.2, and&nbsp;IoT LwIP MQTT example was removed. But maybe this post <a href="https://devzone.nordicsemi.com/f/nordic-q-a/46308/putting-the-right-certificates-in-certificates/182540#182540">here</a> might show you how to configure the certificates.</p><div style="clear:both;"></div>