MQTT协议5.0中文版_mqtt中文版,mqtt5.0协议资源-CSDN文库

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2017 年 10 月 26 日

MQTT v5.0 公开评审草案中文版 1/132

MQTT 协议 5.0 中文版

委员会规范草案 02 /

公开评审草案 02

2017 年 10 月 26 日

规范链接

当前版本：

http://docs.oasis-open.org/mqtt/mqtt/v5.0/csprd02/mqtt-v5.0-csprd02.docx (Authoritative)

http://docs.oasis-open.org/mqtt/mqtt/v5.0/csprd02/mqtt-v5.0-csprd02.html

http://docs.oasis-open.org/mqtt/mqtt/v5.0/csprd02/mqtt-v5.0-csprd02.pdf

以前的版本：

http://docs.oasis-open.org/mqtt/mqtt/v5.0/csprd01/mqtt-v5.0-csprd01.docx (Authoritative)

http://docs.oasis-open.org/mqtt/mqtt/v5.0/csprd01/mqtt-v5.0-csprd01.html

http://docs.oasis-open.org/mqtt/mqtt/v5.0/csprd01/mqtt-v5.0-csprd01.pdf

最新版本

位置。技术委员会产生的其他修订版和其他技

术文档都列在这里：https://www.oasis-

open.org/committees/tc_home.php?wg_abbrev=mqtt#technical .

技术委员会成员对本规范的评论应该发送到技术委员会的邮件列表。其他人应该发送评论到技术委

员会的公共评论列表，方法是点击技术委员会网站的发送评论按钮，网页地址是

https://www.oasis-open.org/committees/mqtt/ .

本规范草案的发布基于 OASIS 知识产权政策的 Non-Assertion 模式。关于实现本规范必不可少的

任何专利是否已公开，以及其他的专利许可条款相关的信息，请参考技术委员会网站的知识产权部

分 (https://www.oasis-open.org/committees/mqtt/ipr.php).

请注意，为本产品声明的任何机器可读内容（计算机语言定义）单独提供纯文本文件。对于产品叙

述文档中出现的任何不一致，以纯文本文档为准。

引用格式：

引用此规范时应该使用下面的引文格式：

[mqtt-v5.0]

MQTT Version 5.0. Edited by Andrew Banks, Ed Briggs, Ken Borgendale, and Rahul Gupta. 26

October 2017. OASIS Committee Specification Draft 02 / Public Review Draft 02.

http://docs.oasis-open.org/mqtt/mqtt/v5.0/csprd02/mqtt-v5.0-csprd02.html. Latest version:

http://docs.oasis-open.org/mqtt/mqtt/v5.0/mqtt-v5.0.html

2017 年 10 月 26 日

MQTT v5.0 公开评审草案中文版 4/132

注意

All capitalized terms in the following text have the meanings assigned to them in the OASIS Intellectual Property

Rights Policy (the "OASIS IPR Policy"). The full Policy may be found at the OASIS website.

This document and translations of it may be copied and furnished to others, and derivative works that comment on

or otherwise explain it or assist in its implementation may be prepared, copied, published, and distributed, in whole

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OASIS invites any party to contact the OASIS TC Administrator if it is aware of a claim of ownership of any patent

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The name "OASIS" is a trademark of OASIS, the owner and developer of this specification, and should be used only

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for above guidance.

2017 年 10 月 26 日

MQTT v5.0 公开评审草案中文版 5/132

1 概述 ................................................................................................................................................................... 12

1.0 知识产权政策 .................................................................................................................................................. 12

1.1 MQTT 协议的组织结构 .................................................................................................................................. 12

1.2 术语 .................................................................................................................................................................. 12

1.3 规范引用 .......................................................................................................................................................... 14

1.4 非规范引用 ...................................................................................................................................................... 14

1.5 数据表示 .......................................................................................................................................................... 17

1.5.1 二进制位 .................................................................................................................................................. 17

1.5.2 双字节整数 .............................................................................................................................................. 17

1.5.3 四字节整数 .............................................................................................................................................. 17

1.5.4 UTF-8 编码字符串 ................................................................................................................................. 17

1.5.5 变长字节整数 .......................................................................................................................................... 19

1.5.6 二进制数据 .............................................................................................................................................. 20

1.5.7 UTF-8 字符串对...................................................................................................................................... 20

1.6 安全 .................................................................................................................................................................. 20

1.7 编辑约定 .......................................................................................................................................................... 20

1.8 变更历史 .......................................................................................................................................................... 20

1.8.1 MQTT v3.1.1 .......................................................................................................................................... 20

1.8.2 MQTT v5.0 .............................................................................................................................................. 20

2 MQTT 控制报文格式........................................................................................................................................ 22

2.1 MQTT 控制报文结构 ...................................................................................................................................... 22

2.1.1 固定报头 .................................................................................................................................................. 22

2.1.2 MQTT 控制报文的类型 .......................................................................................................................... 22

2.1.3 标志 .......................................................................................................................................................... 23

2.1.4 剩余长度 .................................................................................................................................................. 24

2.2 可变报头 .......................................................................................................................................................... 24

2.2.1 报文标识符 .............................................................................................................................................. 24

2.2.2 属性 .......................................................................................................................................................... 26

2.2.2.1 属性长度 ........................................................................................................................................................... 26

2.2.2.2 属性 ................................................................................................................................................................... 26

2.3 有效载荷 .......................................................................................................................................................... 27

2.4 原因码 .............................................................................................................................................................. 28

3 MQTT 控制报文 ............................................................................................................................................... 31

3.1 CONNECT – 连接请求 .................................................................................................................................. 31

3.1.1 CONNECT 固定报头 ............................................................................................................................. 31

3.1.2 CONNECT 可变报头 ............................................................................................................................. 31

3.1.2.1 协议名 ............................................................................................................................................................... 31

3.1.2.2 协议版本 ........................................................................................................................................................... 32

3.1.2.3 连接标志 ........................................................................................................................................................... 32