说明：  MQTT3.1版，中文版本。MQ遥测传输（MQ Telemetry Transport，MQTT）是一个轻量级的基于代理的发布/订阅式消息传输协议，它的设计目标是开放、简单、轻量和易于实现。这些特征使它适用于各种受限环境，比如，但不限于： 网络代价昂贵，低带宽或不可靠。  在嵌入设备中运行，处理器和内存资源有限。
(MQ Telemetry Transport (MQTT) is a lightweight broker-based publish/subscribe messaging protocol designed to be open, simple, lightweight and easy to implement. These characteristics make it ideal for use in constrained environments, for example, but not limited to: Where the network is expensive, has low bandwidth or is unreliable When run on an embedded device with limited processor or memory resources)