spring-integration-mqtt With multiple Mqtt Servers for subscription

[rawat123]

I am using Spring's spring-integration-mqtt and i can connect to a single Mqtt server and can receive messages on subscribed topics , and now i want to make application which can connect to multiple Mqtt Servers and can receive data from every connection and i want to manage it as dynamic where i can add more Mqtt servers from database or text file.

a simple bean for single Mqtt connection for subscription is as follow

@Bean
    public MessageProducer inbound() {

        MqttPahoMessageDrivenChannelAdapter adapter2 =
                new MqttPahoMessageDrivenChannelAdapter("tcp://192.168.100.1:1883","mqtt_virtual_received_sus_2",
                                                 "DATA/#", "LD/#","CONF/#","CONFIG/#");
        adapter2.setCompletionTimeout(0);
        adapter2.setConverter(new DefaultPahoMessageConverter());
        adapter2.setQos(2);

        adapter2.setOutputChannel(mqttInputChannel());
        return adapter2;

    }

above code creates a connection for the mqtt server and can receive messages and if i copy paste the same code twice for second server with different Mqtt ip address i can connect to both Mqtt Server as follows

@Bean
        public MessageProducer inbound() {

            MqttPahoMessageDrivenChannelAdapter adapter2 =
                    new MqttPahoMessageDrivenChannelAdapter("tcp://192.168.100.1:1883","mqtt_virtual_received_sus_2",
                                                     "DATA/#", "LD/#","CONF/#","CONFIG/#");
            adapter2.setCompletionTimeout(0);
            adapter2.setConverter(new DefaultPahoMessageConverter());
            adapter2.setQos(2);

            adapter2.setOutputChannel(mqttInputChannel());
            return adapter2;

        }
@Bean
        public MessageProducer inbound2() {

            MqttPahoMessageDrivenChannelAdapter adapter2 =
                    new MqttPahoMessageDrivenChannelAdapter("tcp://192.168.100.14:1883","mqtt_virtual_received_sus_1",
                                                     "DATA/#", "LD/#","CONF/#","CONFIG/#");
            adapter2.setCompletionTimeout(0);
            adapter2.setConverter(new DefaultPahoMessageConverter());
            adapter2.setQos(2);

            adapter2.setOutputChannel(mqttInputChannel());
            return adapter2;

        }

above code also works fine and i can receive message from both Mqtt Servers, but is there any way i can manage it dynamically like as follows, i change the bean's return type to list, but didn't worked:

@Bean
 public List<MqttPahoMessageDrivenChannelAdapter> getAdapter () {
     List<MqttPahoMessageDrivenChannelAdapter > logConfList=new ArrayList<MqttPahoMessageDrivenChannelAdapter>();
     MqttPahoMessageDrivenChannelAdapter adapter2 =
             new MqttPahoMessageDrivenChannelAdapter("tcp://192.168.100.1:1883","mqtt_virtual_received_sus_2",
                                              "DATA/#", "LD/#","CONF/#","CONFIG/#");
     adapter2.setCompletionTimeout(0);
     adapter2.setConverter(new DefaultPahoMessageConverter());
     adapter2.setQos(2);

     adapter2.setOutputChannel(mqttInputChannel() );

     MqttPahoMessageDrivenChannelAdapter adapter =
             new MqttPahoMessageDrivenChannelAdapter("tcp://192.168.100.14:1883","mqtt_virtual_received_sus_1",
                                              "DATA/#", "LD/#","CONF/#","CONFIG/#");
     adapter.setCompletionTimeout(0);
     adapter.setConverter(new DefaultPahoMessageConverter());
     adapter.setQos(2);

     adapter.setOutputChannel(mqttInputChannel() );
     logConfList.add(adapter);
     logConfList.add(adapter2);

     return logConfList;

 }

is there any way i can manage these beans dynamically, where i can fetch mqtt server details from text file and in a for loop or something i can manage multiple connections.

[Artem Bilan]

Please, don't duplicate questions in different places: https://stackoverflow.com/questions/48474720/spring-integration-mqtt-with-multiple-mqtt-servers-for-subscription.

Moreover we don't manage questions here on GH. The StackOverflow is indeed the place to go.

Thank you for understanding.