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阿里云物联网开发支持LWM2M、MQTT、COAP哪些协议，支持NB、LoRa、WiFi等哪些通信模

如图所示，服务开发里面的mqtt订阅输入，如何配置其topic及调试？

如图所示，在业务逻辑开发里面的 mqtt订阅输入，这里的topic能否是我设备自定义的topic，应如何查看是否配置成功及调试？

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iOS开发之MQTT探究

1、什么是MQTT? MQTT(MessageQueueing Telemetry Transport Protocol)的全称是消息队列遥感传输协议的缩写，是由IBM公司推出的一种基于轻量级代理的发布/订阅模式的消息传输协议，运行在TCP协议栈之上，为其提供有序、可靠、双向连接的网络连接保证。由...

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