> For the complete documentation index, see [llms.txt](https://coolpy7.gitbook.io/coolpy7book/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://coolpy7.gitbook.io/coolpy7book/mqtt-xie-yi-ji-chu-zhi-shi/yong-hu-zhi-nan.md).

# MQTT应用指南

### MQTT 发布订阅

 MQTT 是为移动互联网、物联网设计的轻量发布订阅模式的消息服务器:

![](/files/-LQXxTrU0pb8Uy4JFybz)

 CP7消息服务器安装启动后，任何设备或终端的 MQTT 客户端，可通过 MQTT 协议连接到服务器，发布订阅消息方式互通。

&#x20;MQTT 协议客户端库: <https://github.com/mqtt/mqtt.github.io/wiki/libraries>

&#x20;例如，mosquitto\_sub/pub 命令行发布订阅消息:

```
mosquitto_sub -t topic -q 2
mosquitto_pub -t topic -q 1 -m "Hello, MQTT!"
```

### MQTT WebSocket 连接

CP7 消息服务器支持 MQTT WebSocket 连接，Web 浏览器可直接通过 MQTT 协议连接服务器:

| WebSocket URI:          | ws(s)://host:8083/         |
| ----------------------- | -------------------------- |
| Sec-WebSocket-Protocol: | ‘mqttv3.1’ or ‘mqttv3.1.1’ |