CODEWITHSUNDEEP
node.jsiotmosquittonode-red
Pankesh Patel
Pankesh Patel

Reputation: 1302

connecting external MQTT publisher with NODE-RED

In my current project, I am trying to connect my external temperature sensor to NODE-RED.

I have plugged MQTT with the external sensor. This sensor is publishing data with tempMeasurement topic. The configuration of MQTT publisher is as follows:

public class MQTTPublisher {

    // public static final String BROKER_URL =
    // "tcp://broker.mqttdashboard.com:1883";
    public static final String BROKER_URL = "tcp://test.mosquitto.org:1883";

    private MqttClient client;

    public MQTTPublisher() {
        try {
            client = new MqttClient(BROKER_URL, MqttClient.generateClientId(),
                    new MemoryPersistence());
            client.connect();

        } catch (MqttException e) {
            e.printStackTrace();
        }
    }

    public void publish(String topicName, int qos, byte[] payload)
            throws MqttException {
        final MqttTopic topic = client.getTopic(topicName);

        final MqttMessage message = new MqttMessage(payload);
        topic.publish(message);

        System.out.println("Published data. Topic: " + topic.getName()
                + "  Message: " + payload);
    }
}

On the other side in Node-RED, I have created MQTT node, that has subscribe "tempMesurement". The configuration of MQTT node in NODE-RED is as follows:

enter image description here

enter image description here

My problem is that MQTT subscriber node is showing disconnected message as show in the above figure. Could you please suggest - what is wrong with the configuration in NODE-RED? How can I resolve this issue?

Upvotes: 2

Views: 1699

Answers (1)

hardillb
hardillb

Reputation: 59608

As mentioned in the comments, you need to remove the tcp:// from the sever name in the config screen

Upvotes: 1

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