I am using mosquitto MQTT protocol. I want to know when queue created in MQTT broker ,while publishing or subscription or both subscription and publishing?
$SYS/broker/clients/connected displays number of connected clients, at the same can we find number of queues in MQTT broker..?
Thanks in advance..
The short answer is you don't.
MQTT uses topics not queues (this is important as they are very different concepts) and a topic basically only really exists at the moment a message is published to it.
When a message is published the broker checks all the existing subscriptions for any that matches and then delivers that message to those clients with the matching subscription.
A queue is a mechanism where normally messages are collected and each message is only delivers to one client no matter how many are connected to the queue. With a topic messages are delivered to every client that has a matching subscription.
