https://devzone.nordicsemi.com/f/nordic-q-a/93106/nrf9160-mfw-1-3-2-nrfxlib-2-1-0---additional-tls-detailsAccording nrfxlib - modem library - supported features , the nRF9160 firmware supports: DTLS 1.2 client TLS 1.2 client My experience with the TLS client is, that it supports TLS 1.3 as well. Using fd = socket ( AF_INET , SOCK_STREAMen-USTelligent Community 13Fri, 21 Oct 2022 14:47:36 GMThttps://devzone.nordicsemi.com/thread/391942?ContentTypeID=1Fri, 21 Oct 2022 14:47:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:806c0dae-49f7-4434-8d3e-35988c508835Achim Kraus<p>The TLS 1.3 traffic was a different client, which I was unaware of.</p><div style="clear:both;"></div>