mqtt

After MQTT is successfully connected , messages may be published .

MQTT成功连接之后，就可以发布消息了。

This article explained how to create a fully functional MQTT publisher .

本文介绍了如何创建功能全面的MQTT发布程序。

This article is a guide to writing an MQTT publisher application in Java .

本文是用Java编写MQTT发布程序的指南。

An MQTT properties object is constructed and supplied to the client creation factory .

首先，必须构成并向客户机创建工厂提供MQTT属性对象。

The registerCallback method provides registration features for the MQTT client .

registerCallback方法提供MQTT客户机的注册特性。

Applications publish through an MQTT client object .

应用程序通过MQTT客户对象发布消息。

The IBM MQTT protocol is used in many diverse environments to connect a variety of sensor systems .

在许多不同的环境中，IBMMQTT协议被用来连接各种传感器系统。

As a protocol , MQTT has no throttling features .

作为协议，MQTT没有节流功能。

After properties configuration , an MQTT client instance is obtained from the MQTT client factory .

属性配置之后，MQTT客户实例会从MQTT客户机工厂获得。

MQTT messages also do not have the concept of user-defined header properties as JMS does .

MQTT消息也没有JMS的那些用户自定义的报头属性的概念。

MQTT is a powerful transport for the publish / subscribe messaging paradigm .

MQTT是面向发布/订阅消息范型的一个功能强大的传送机制。

The aspects covered by this article are also directly applicable to WebSphere Message Broker because both support the MQTT protocol .

本文所涵盖的方方面面都可以直接应用到WebSphereMessageBroker，因为二者都支持MQTT协议。

This article extends the concepts of the previous article and goes on to explain how to publish messages using MQTT .

本文扩展了上述文章中所触及的概念并继续介绍了如何使用MQTT发布消息。

To receive notifications , an implementation of the advanced callback interface must be registered with the MQTT client .

要接收通知，高级回调接口的实现必须要用MQTT客户端注册。

When you create your MQTT application , you must carefully plan the topic space to be logical and to enable flexible subscriptions .

在创建MQTT应用程序时，必须认真将主题空间设计得符合逻辑，并且支持灵活订阅。

By the end of this article , you are equipped with the knowledge required to create a simple MQTT publisher for your business .

学习完本文后，您应该具备了按自己的业务需要创建简单的MQTT发布程序所需的知识。

In the first scenario , a person with an MQTT client application on his or her phone is meeting someone at the airport .

在第一个场景中，假设此人的电话上安装了MQTT客户应用程序，他在机场等待接机。

When an update arrives from an MQTT topic , determine the target feed and add the update to an internal queue structure .

在收到来自MQTT主题的更新时，要确定目标Feed并将更新添加到内部队列结构。

The MQTT client supports the three qualities of service defined by the MQTT protocol specification for sending messages to the broker

MQTT客户机支持MQTT协议规范为向代理发送消息而定义的三种服务质量

MQTT enforces few rules about the topic space , and you are responsible for designing a logical information space that makes sense for your application .

MQTT对于主题空间有一些强制规定，但设计适合您自己应用程序的逻辑信息空间则由您负责。

To receive acknowledgments of publications , a callback handler must be created and registered with the MQTT client object .

要收到发布的确认，必须创建回调处理程序，此处理程序还必须用MQTT客户机对象注册。

MQTT is a TCP / IP-based publish / subscribe messaging protocol , designed for communication over low-overhead networks .

MQTT是基于TCP/IP的发布/订阅消息传递协议，针对低负荷网络的通信而设计。

The micro broker supports the specialist pervasive messaging MQTT protocol specification and provides a proprietary Java MQTT messaging client .

微代理支持专家级的普及消息传递MQTT协议规范，并提供专有的JavaMQTT消息传递客户机。

Typically , an individual source of data is mapped to an MQTT topic , which usually means that each source of sensor information will have its own topic .

通常，会将个人数据来源映射到MQTT主题，这意味着每个传感器的信息来源都有自己的主题。

Subscribing and publishing to MQTT topics

订阅并发布到MQTT主题

The MQTT protocol lets brokers optionally control access using username and password pairs , but once authenticated , all actions are authorised .

MQTT协议允许Broker使用用户名和密码有选择地控制访问，但在通过身份验证之后，所有操作均被授权。

The MQTT client has much simpler semantics than JMS because there is no concept of sessions , consumers , producers , or application control of transactions .

MQTT客户机的语义比JMS简单很多，因为没有会话、用户、生产者或事务处理的应用程序控制这样的概念。

MQTT is a messaging protocol developed by IBM , previously available in WebSphere Message Broker , and donated by IBM to the open-source community .

MQTT是由IBM开发的信息传递协议，以前可用于WebSphereMessageBroker并由IBM捐献给开源社区。

The MQTT client tracks any publications that were in flight in the event of a connection failure , and it attempts to complete the message delivery upon reconnection .

MQTT客户机可跟踪连接故障时的所有发布，并试图一旦重建连接就即刻完成消息传递。

MQ Telemetry Transport ( MQTT ) is a lightweight broker-based publish / subscribe messaging protocol designed to be open , simple , lightweight and easy to implement .

MQ遥测传输（MQTT）是轻量级基于代理的发布/订阅的消息传输协议，设计思想是开放、简单、轻量、易于实现。