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How to get a secure thread network ?

Hi all,

I am working with Thread SDK v3.1.

When I run mqttsn-client-public and subcribe to make MQTT-SN network use UDP. But it doesn't have DLTS. 

In the topic : https://devzone.nordicsemi.com/f/nordic-q-a/41054/mqttsn-with-dtls , they said, this example is using AES128 and Thread embedded encryption, I tried to find the part using AES128 but I did't see it. 

Data was sent by otUdpSend function, so it doesn't have AES128 secure, I think it only use Thread embedded encryption.

Please show me how to use AES128 in the example ?