Is MQTT payload encrypted?

[FrozenArm]

Hello, I have an application on ESP-IDF v4.2 that is using the IDF's "mqtt_client" to publish to a broker. The application is passing a CA cert to authenticate the broker.

However, I'm wondering if the data being published by the mqtt_client is encrypted? And if not, is there a way for me to do that?

[ESP_YJM]

Yes, we supporrt mqtts. It will encrypt mqtt packet.