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一个工业物联网的底层架构框架，专注于底层的技术通信及跨平台，跨语言通信功能，实现各种主流的PLC数据读写，实现modbus的各种协议读写等等

There is a newer version: 3.7.0

package HslCommunication.MQTT;

import HslCommunication.BasicFramework.SoftBasic;

/**
 * 订阅的消息类，用于客户端向服务器请求订阅的信息

 * Subscribed message class, used by the client to request subscription information from the server
 */
public class MqttSubscribeMessage {
    /**
     * 实例化一个默认的对象

     * Instantiate a default object
     */
    public MqttSubscribeMessage( )
    {
        QualityOfServiceLevel = MqttQualityOfServiceLevel.AtMostOnce;
    }

    /**
     * 这个字段表示应用消息分发的服务质量等级保证。分为，最多一次，最少一次，正好一次

     * This field indicates the quality of service guarantee for application message distribution. Divided into, at most once, at least once, exactly once
     */
    public MqttQualityOfServiceLevel QualityOfServiceLevel;

    /**
     * 当前的消息的标识符，当质量等级为0的时候，不需要重发以及考虑标识情况

     * The identifier of the current message, when the quality level is 0, do not need to retransmit and consider the identification situation
     */
    public int Identifier = 0;

    /**
     * 当前订阅的所有的主题的数组信息

     * Array information of all topics currently subscribed
     */
    public String[] Topics = null;

    public String toString( ) {
        return  "MqttSubcribeMessage" + SoftBasic.ArrayFormat( Topics ) + "}";
    }
}