https://devzone.nordicsemi.com/f/nordic-q-a/70365/problem-about-use-nrf-connect-sdk-v1-4-99-dev-to-implement-lwm2m-on-nrf52840dkI want to implement lwm2m, and I use nRF Connect SDK v1.4.99-dev to compile the thread firmware. I am using 52840DK, here is a screenshot of my project creation No code changes . Then select build-&gt;build zephyr zephyr .hex. and target-&gt;connect Jen-USTelligent Community 13Tue, 12 Jan 2021 12:08:14 GMThttps://devzone.nordicsemi.com/thread/288627?ContentTypeID=1Tue, 12 Jan 2021 12:08:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a6b03de3-f07a-4186-b3a6-33eeac2e06d6Marte Myrvold<p>Hi,</p> <p>The&nbsp;<a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.4.99-dev1/nrf/samples/nrf9160/lwm2m_client/README.html">LwM2M Client sample</a>&nbsp;is a nRF9160 sample, and therefore you won&#39;t be able to get it to work with nRF52840. The sample itself connects an nRF9160 DK to an LwM2M server via LTE, and the nRF52840 doesn&#39;t have LTE, so it wouldn&#39;t be possible to use the sample as it is on the nRF52840.</p> <p>Best regards,</p> <p>Marte</p><div style="clear:both;"></div>