MQTT supports TLS and TLS can be implemented and the standard too defines a port 8883 for the TLS…
DSM Ranjith Kumar
1

Thanks Ranjith for adding your comment. MQTT needs to evolve as it goes and widely used in real use cases. It has undergone lot of changes and now it is an OASIS standard.

https://www.oasis-open.org/news/announcements/mqtt-version-3-1-1-becomes-an-oasis-standard

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