仅在订阅 mqtt Broker 一个主题的一个用户处发送消息

Question

I apologize if the question may seem silly.

I have a mqtt broker on which I have for example the topic "ChatBox/Chat_1", on this topic there are subcribed many users, but if the master that is subcribed so "ChatBox" wanted to send a message to a single user in Chat_1 without the others receiving it, there is a method or not?

Answer 1

MQTT Messages are published to topics, not individual clients/users. All clients subscribed to the topic will receive all messages published to that topic.

There is no way to send a message to a specific client without writing a totally custom MQTT broker (which would then be in violation of the spec)