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MQTT 3.1.1 中文版

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中文版 HTML MQTT 3.1.1 中文版
中文版 PDF MQTT 3.1.1 中文版
英文版 HTML MQTT Version 3.1.1
英文版 PDF MQTT Version 3.1.1

概述

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MQTT是一个客户端服务端架构的发布/订阅模式的消息传输协议。它的设计**是轻巧、开放、
简单、规范,因此易于实现。这些特点使得它对很多场景来说都是很好的选择,包括受限的环境如
机器与机器的通信(M2M)以及物联网环境(IoT),这些场景要求很小的代码封装或者网络带宽
非常昂贵。

MQTT协议运行在TCP/IP或其它提供了有序、可靠、双向连接的网络上,特点:

  • 使用发布/订阅消息模式,提供了一对多的消息分发和应用之间的解耦。
  • 消息传输不需要知道有效载荷的内容。
  • 提供三种等级的服务质量:.
    • "最多一次",尽操作环境所能提供的最大努力分发消息。
    • "至少一次",保证消息可以到达,但是可能会重复。
    • "仅一次",保证消息只到达一次。
  • 很小的传输消耗和协议数据交换,最大限度减少网络流量
  • 异常连接断开发生时,能通知到相关各方。

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