I am using MQTT node to publish and subscribe on different topics (all the same flow) to mosquitto broker.
everything work very well, I can send command to the node-red in raspberry pi3 and publish data from sensor to the broker.
but I monitor the traffic in wireshark, I have found that MQTT publish and subscriber in the same TCP Channel, when I checked the conversation statistic in wireshark it is only one connection with two way, that means, it has only the following two connections:
raspberry pi IP to Mosquitto IP
mosquitto IP to raspberry pi
only these two, and the packet counts and size are increasing all the time.
my question, can we make mqtt over multiple TCP connections?