基本信息

---

下载

   友情提示：（无需注册或充值，赞助后即可获取资源下载链接）

---

     嘿，亲！知识可是无价之宝呢，但咱这精心整理的资料也耗费了不少心血呀。小小地破费一下，绝对物超所值哦！如有下载和支付问题，请联系我们QQ(微信同号)：813200300

本次赞助数额为： 2 元　

支付宝支付

微信支付

   源码介绍

---

MQTT-3.1.1-CN.pdf

目录
1 概述 ......................................................................................................................................................8
1.1 MQTT 协议的组织结构........................................................................................................................8
1.2 术语.....................................................................................................................................................8
1.3 规范引用..............................................................................................................................................9
1.4 非规范引用........................................................................................................................................10
1.5 数据表示............................................................................................................................................12
1.5.1 二进制位 ....................................................................................................................................12
1.5.2 整数数值 ....................................................................................................................................12
1.5.3 UTF-8 编码字符串 .....................................................................................................................12
1.6 编辑约定............................................................................................................................................13
2 MQTT 控制报文格式...........................................................................................................................14
2.1 MQTT 控制报文的结构......................................................................................................................14
2.2 固定报头............................................................................................................................................14
2.2.1 MQTT 控制报文的类型 ..............................................................................................................14
2.2.2 标志 ...........................................................................................................................................15
2.2.3 剩余长度 ....................................................................................................................................16
2.3 可变报头............................................................................................................................................17
2.3.1 报文标识符.................................................................................................................................17
2.4 有效载荷............................................................................................................................................19
3 MQTT 控制报文 ..................................................................................................................................20
3.1 CONNECT – 连接服务端..................................................................................................................20
3.1.1 固定报头 ....................................................................................................................................20
3.1.2 可变报头 ....................................................................................................................................20
3.1.3 有效载荷 ....................................................................................................................................26
3.1.4 响应 ...........................................................................................................................................27
3.2 CONNACK – 确认连接请求 ..............................................................................................................28
3.2.1 固定报头 ....................................................................................................................................28
3.2.2 可变报头 ....................................................................................................................................28
3.2.3 有效载荷 ....................................................................................................................................30
3.3 PUBLISH – 发布消息........................................................................................................................30
3.3.1 固定报头 ....................................................................................................................................30
3.3.2 可变报头 ....................................................................................................................................32
3.3.3 有效载荷 ....................................................................................................................................33
3.3.4 响应 ...........................................................................................................................................33
3.3.5 动作 ...........................................................................................................................................33
3.4 PUBACK –发布确认..........................................................................................................................33
3.4.1 固定报头 ....................................................................................................................................33
3.4.2 可变报头 ....................................................................................................................................34
3.4.3 有效载荷 ....................................................................................................................................34
MQTT-3.1.1-CN 5
3.4.4 动作 ...........................................................................................................................................34
3.5 PUBREC – 发布收到（QoS 2，第一步） ........................................................................................34
3.5.1 固定报头 ....................................................................................................................................34
3.5.2 可变报头 ....................................................................................................................................34
3.5.3 有效载荷 ....................................................................................................................................35
3.5.4 动作 ...........................................................................................................................................35
3.6 PUBREL – 发布释放（QoS 2，第二步）.........................................................................................35
3.6.1 固定报头 ....................................................................................................................................35
3.6.2 可变报头 ....................................................................................................................................35
3.6.3 有效载荷 ....................................................................................................................................36
3.6.4 动作 ...........................................................................................................................................36
3.7 PUBCOMP – 发布完成（QoS 2，第三步） .....................................................................................36
3.7.1 固定报头 ....................................................................................................................................36
3.7.2 可变报头 ....................................................................................................................................36
3.7.3 有效载荷 ....................................................................................................................................36
3.7.4 动作 ...........................................................................................................................................36
3.8 SUBSCRIBE - 订阅主题 ...................................................................................................................37
3.8.1 固定报头 ....................................................................................................................................37
3.8.2 可变报头 ....................................................................................................................................37
3.8.3 有效载荷 ....................................................................................................................................37
3.8.4 响应 ...........................................................................................................................................39
3.9 SUBACK – 订阅确认.........................................................................................................................40
3.9.1 固定报头 ....................................................................................................................................40
3.9.2 可变报头 ....................................................................................................................................40
3.9.3 有效载荷 ....................................................................................................................................41
3.10 UNSUBSCRIBE –取消订阅 ............................................................................................................41
3.10.1 固定报头 ..................................................................................................................................42
3.10.2 可变报头 ..................................................................................................................................42
3.10.3 有效载荷 ..................................................................................................................................42
3.10.4 响应 .........................................................................................................................................43
3.11 UNSUBACK – 取消订阅确认 ..........................................................................................................43
3.11.1 固定报头 ..................................................................................................................................44
3.11.2 可变报头 ..................................................................................................................................44
3.11.3 有效载荷 ..................................................................................................................................44
3.12 PINGREQ – 心跳请求.....................................................................................................................44
3.12.1 固定报头 ..................................................................................................................................44
3.12.2 可变报头 ..................................................................................................................................45
3.12.3 有效载荷 ..................................................................................................................................45
3.12.4 响应 .........................................................................................................................................45
3.13 PINGRESP – 心跳响应...................................................................................................................45
3.13.1 固定报头 ..................................................................................................................................45
MQTT-3.1.1-CN 6
3.13.2 可变报头 ..................................................................................................................................45
3.13.3 有效载荷 ..................................................................................................................................45
3.14 DISCONNECT –断开连接...............................................................................................................45
3.14.1 固定报头 ..................................................................................................................................46
3.14.2 可变报头 ..................................................................................................................................46
3.14.3 有效载荷 ..................................................................................................................................46
3.14.4 响应 .........................................................................................................................................46
4 操作行为 .............................................................................................................................................47
4.1 状态存储............................................................................................................................................47
4.1.1 非规范示例.................................................................................................................................47
4.2 网络连接............................................................................................................................................47
4.3 服务质量等级和协议流程 ..................................................................................................................48
4.3.1 QoS 0:最多分发一次..................................................................................................................48
4.3.2 QoS 1: 至少分发一次.................................................................................................................48
4.3.3 QoS 2: 仅分发一次 ....................................................................................................................49
4.4 消息分发重试 ....................................................................................................................................51
4.5 消息收到............................................................................................................................................51
4.6 消息排序............................................................................................................................................51
4.7 主题名和主题过滤器 .........................................................................................................................52
4.7.1 主题通配符.................................................................................................................................52
4.7.2 以$开头的主题...........................................................................................................................53
4.7.3 主题语义和用法 .........................................................................................................................53
4.8 错误处理............................................................................................................................................54
5 安全 ....................................................................................................................................................55
5.1 概述...................................................................................................................................................55
5.2 MQTT 解决方案：安全和认证...........................................................................................................55
5.3 轻量级的加密与受限设备 ..................................................................................................................55
5.4 实现注意事项 ....................................................................................................................................55
5.4.1 客户端身份验证 .........................................................................................................................56
5.4.2 客户端授权.................................................................................................................................56
5.4.3 服务端身份验证 .........................................................................................................................56
5.4.4 控制报文和应用消息的完整性....................................................................................................56
5.4.5 控制报文和应用消息的保密性....................................................................................................56
5.4.6 消息传输的不可否认性 ..............................................................................................................56
5.4.7 检测客户端和服务端的盗用 .......................................................................................................57
5.4.8 检测异常行为.............................................................................................................................57
5.4.9 其它的安全注意事项..................................................................................................................57
5.4.10 使用 SOCKS 代理....................................................................................................................58
5.4.11 安全配置文件...........................................................................................................................58
6 使用 WebSocket 作为网络层 ..............................................................................................................59
6.1 IANA 注意事项 ..................................................................................................................................59
MQTT-3.1.1-CN 7
7 一致性.................................................................................................................................................60
7.1 一致性目标........................................................................................................................................60
7.1.1 MQTT 服务端.............................................................................................................................60
7.1.2 MQTT 客户端.............................................................................................................................60
附录 B 强制性规范声明（非规范） .............................................................................................................62