https://devzone.nordicsemi.com/f/nordic-q-a/74649/can-t-establish-tls-psk-connection-to-mqtt-brokerHello, I&#39;m writing software for my own board with nrf52840 and SIM800C modem. I try to connect to MQTT broker. It works when I have TLS disabled or have TLS with certificate enabled. But fails when I try to connect to broker with TLS-PSK enabled.en-USTelligent Community 13Tue, 04 May 2021 12:16:48 GMThttps://devzone.nordicsemi.com/thread/308167?ContentTypeID=1Tue, 04 May 2021 12:16:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c76ee550-9d7a-42d3-bdde-8dd6dd1b7642Grzegorz Blach<p>I&#39;m running TLS stack on the nRF52840. Generally the network part of my application is based on these samples:</p> <p><a href="https://github.com/nrfconnect/sdk-zephyr/tree/master/samples/net/gsm_modem">https://github.com/nrfconnect/sdk-zephyr/tree/master/samples/net/gsm_modem</a></p> <p><a href="https://github.com/nrfconnect/sdk-zephyr/tree/master/samples/net/dns_resolve">https://github.com/nrfconnect/sdk-zephyr/tree/master/samples/net/dns_resolve</a></p> <p><a href="https://github.com/nrfconnect/sdk-zephyr/tree/master/samples/net/mqtt_publisher">https://github.com/nrfconnect/sdk-zephyr/tree/master/samples/net/mqtt_publisher</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/308074?ContentTypeID=1Tue, 04 May 2021 07:43:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:39e76035-0aa2-4f70-b1c5-f4248bbc8835Heidi<p>Hi!</p> <p></p> <p>I&#39;ll need some more information about your application. For instance, are you running the TLS stack on the nRF52840 or the modem?&nbsp;</p> <p></p> <p>Best regards,</p> <p>Heidi</p><div style="clear:both;"></div>