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MQTT物联网协议完全实践指南 · App Inventor 2 中文网
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MQTT采用客户端-服务器架构，基于发布/订阅（Publish/Subscribe）模式实现消息传递：
graph LR
A[发布者A] --> C[MQTT代理服务器]
B[发布者B] --> C
C --> D[订阅者X]
C --> E[订阅者Y]
C --> F[订阅者Z]
核心组件说明：
发布者...
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