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MQTT物联网协议完全实践指南 · App Inventor 2 中文网
...载：
de.ullisroboterseite.ursai2pahomqtt.aix
完整示例项目：
mqtt_demo.aia
MQTT协议深度解析
1. 协议架构与通信模式
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：
grap...
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Test whether string is a valid integer
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12 Answers
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PHP validation/regex for URL
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/(.*)<FooBar>/s
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