org.springframework.boot
      spring-boot-starter-integration
    
    
      org.springframework.integration
      spring-integration-stream
    
    
      org.springframework.integration
      spring-integration-mqtt
    

  @Bean
  public MqttPahoClientFactory mqttClientFactory() {
    DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
    factory.setServerURIs("tcp://demo:1883");
//    factory.setUserName("guest");
//    factory.setPassword("guest");
    return factory;
  }

  @Bean
  public IntegrationFlow mqttInFlow() {
    return IntegrationFlows.from(mqttInbound())
        .transform(p -> p + ", received from MQTT")
        .handle(logger())
        .get();
  }

  private LoggingHandler logger() {
    LoggingHandler loggingHandler = new LoggingHandler("INFO");
    loggingHandler.setLoggerName("siSample");
    return loggingHandler;
  }

  @Bean
  public MessageProducerSupport mqttInbound() {
    MqttPahoMessageDrivenChannelAdapter adapter = new MqttPahoMessageDrivenChannelAdapter("siSampleConsumer",
        mqttClientFactory(), "siSampleTopic");
    adapter.setCompletionTimeout(5000);
    adapter.setConverter(new DefaultPahoMessageConverter());
    adapter.setQos(1);
    return adapter;
  }

@Bean
  public IntegrationFlow mqttOutFlow() {
    //console input
//    return IntegrationFlows.from(CharacterStreamReadingMessageSource.stdin(),
//        e -> e.poller(Pollers.fixedDelay(1000)))
//        .transform(p -> p + " sent to MQTT")
//        .handle(mqttOutbound())
//        .get();
    return IntegrationFlows.from(outChannel())
        .handle(mqttOutbound())
        .get();
  }
  
  @Bean
  public MessageChannel outChannel() {
    return new DirectChannel();
  }

  @Bean
  public MessageHandler mqttOutbound() {
    MqttPahoMessageHandler messageHandler = new MqttPahoMessageHandler("siSamplePublisher", mqttClientFactory());
    messageHandler.setAsync(true);
    messageHandler.setDefaultTopic("siSampleTopic");
    return messageHandler;
  }

@MessagingGateway(defaultRequestChannel = "outChannel")
public interface MsgWriter {
  void write(String note);
}