content: package com.smart.common.mqtt;
  
  import lombok.extern.slf4j.Slf4j;
  import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
  import org.springframework.beans.factory.annotation.Value;
  import org.springframework.context.annotation.Bean;
  import org.springframework.context.annotation.Configuration;
  import org.springframework.integration.annotation.IntegrationComponentScan;
  import org.springframework.integration.annotation.ServiceActivator;
  import org.springframework.integration.channel.DirectChannel;
  import org.springframework.integration.mqtt.core.DefaultMqttPahoClientFactory;
  import org.springframework.integration.mqtt.core.MqttPahoClientFactory;
  import org.springframework.integration.mqtt.outbound.MqttPahoMessageHandler;
  import org.springframework.messaging.MessageChannel;
  import org.springframework.messaging.MessageHandler;
  
  @Slf4j
  @Configuration
  @IntegrationComponentScan
  public class MqttSenderConfig {
  
      @Value("${spring.mqtt.username}")
      private String username;
      @Value("${spring.mqtt.password}")
      private String password;
      @Value("${spring.mqtt.url}")
      private String hostUrl;
      @Value("${spring.mqtt.client.id}")
      private String clientId;
      @Value("${spring.mqtt.default.topic}")
      private String defaultTopic;
      @Value("${spring.mqtt.default.completionTimeout}")
      private int completionTimeout;
  
      @Bean
      public MqttConnectOptions getMqttConnectOptions() {
          MqttConnectOptions mqttConnectOptions = new MqttConnectOptions();
          mqttConnectOptions.setCleanSession(true);
          mqttConnectOptions.setConnectionTimeout(10);
          mqttConnectOptions.setKeepAliveInterval(90);
          mqttConnectOptions.setAutomaticReconnect(true);
          mqttConnectOptions.setUserName(username);
          mqttConnectOptions.setPassword(password.toCharArray());
          mqttConnectOptions.setServerURIs(new String[]{hostUrl});
          mqttConnectOptions.setKeepAliveInterval(2);
          return mqttConnectOptions;
      }
  
      @Bean
      public MqttPahoClientFactory mqttClientFactory() {
          DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
          factory.setConnectionOptions(getMqttConnectOptions());
          return factory;
      }
  
      @Bean
      @ServiceActivator(inputChannel = "mqttOutboundChannel")
      public MessageHandler mqttOutbound() {
          MqttPahoMessageHandler messageHandler = new MqttPahoMessageHandler(clientId, mqttClientFactory());
          messageHandler.setAsync(true);
          messageHandler.setDefaultTopic(defaultTopic);
          return messageHandler;
      }
  
      @Bean
      public MessageChannel mqttOutboundChannel() {
          return new DirectChannel();
      }
  }
  