package com.ssi.mqtt;

import lombok.extern.slf4j.Slf4j;
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;

@Slf4j
public class MQTTSubcribeClient {

  public String HOST;
  private MqttClient client;
  private MqttConnectOptions options;

  public MQTTSubcribeClient(String host, String clientid, String mqttCAPath) {
    try {
      this.HOST = host;
      log.info("MQTTSubcribeClient instanced");
      // host为主机名，clientid即连接MQTT的客户端ID，一般以唯一标识符表示，MemoryPersistence设置clientid的保存形式，默认为以内存保存
      client = new MqttClient(HOST, clientid, new MemoryPersistence());
      // MQTT的连接设置
      options = new MqttConnectOptions();
      // 设置是否清空session,这里如果设置为false表示服务器会保留客户端的连接记录，设置为true表示每次连接到服务器都以新的身份连接
      options.setCleanSession(false);
      // 设置超时时间 单位为秒
      options.setConnectionTimeout(20);
      // 设置会话心跳时间 单位为秒 服务器会每隔5秒的时间向客户端发送个消息判断客户端是否在线，但这个方法并没有重连的机制
      options.setKeepAliveInterval(10);
      options.setAutomaticReconnect(true);//设置自动重连

      // 设置回调
      try {
        options.setSocketFactory(SslUtil.getSocketFactory(mqttCAPath, "/UserProfile/ca/client.crt",
            "/UserProfile/ca/client.key", "123456"));
      } catch (Exception e) {
        e.printStackTrace();
      }

      client.setCallback(new SubcribeCallBack());
      client.connect(options);
      //订阅消息
      String[] topic1 = {"ssiweb"};
      client.subscribe(topic1);
    } catch (MqttException e) {
      e.printStackTrace();
    }

  }
}