Shulou(Shulou.com)06/01 Report--

This article will explain in detail the process of connecting Client to Broker, and the content of the article is of high quality, so the editor will share it with you for reference. I hope you will have some understanding of the relevant knowledge after reading this article.

Client must connect to Broker before it can publish and subscribe to messages. Let's take a look at the process of Client connecting to Broker.

The process of connecting Client to Broker

The process for Client to establish a connection to Broker is as follows: "CONNECT":

The establishment of the connection is initiated by the Client side, and the Client side first sends a CONNECT packet to Broker. The CONNECT packet contains the following (let's skip Fixed header here).

1. Variable head (Variable header)

The CONNECT packet variable header contains the following information.

Protocol name (Protocol Name): the value is fixed to the character "MQTT".

Protocol version (Protocol Level): for MQTT 3.1.1, the value is 4.

"user name ID" (User Name Flag): whether there is a user name field in the body of the message, 1 bitline 0 or 1.

"password ID" (Password Flag): whether there is a password field in the message body, 1 bit, 0 or 1.

This is how the process of connecting Client to Broker is shared here. I hope the above content can be helpful to you and learn more knowledge. If you think the article is good, you can share it for more people to see.

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