is it possible to do 3way handshake only one time with mqtt communication?

Omar Best Answer 2 weeks ago

That’s actually a really good observation. By default, each time you run mosquitto_pub ragdoll hit , it opens a new TCP/TLS connection to the broker, which is why you see a full 3-way handshake every time. To avoid that overhead, you’d need to keep a persistent connection open instead of starting a new one for every message. You can do this using the Mosquitto client library (like in Python or C) where you connect once and publish repeatedly, or by using mosquitto_pub in a loop with the -l or --stdin-line option to reuse the same connection.