Hello @Gencay
You can get started with this wiki Introduction to NETXDUO - stm32mcu
You can check Application Nx_MQTT_Client. It demonstrates how to exchange data between client and server using MQTT protocol in an encrypted mode supporting TLS v1.2
You can find DTLS implementation under this link.
stm32_mw_netxduo/nx_secure/src at 52418498ef76f8b733b6414420c0672eb38684bf · STMicroelectronics/stm32_mw_netxduo (github.com)
However, there is no example code for DTLS protocol.
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