IoT using Eclipse Paho for Java, Mosquitto MQTT and ESP8266

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In this video, I build a simple Internet-of-Things example using the following tools:

  • Microsoft Windows 10 PC
  • Eclipse Mosquitto free MQTT Message Broker for Windows
  • Eclipse Paho Java library
  • An ESP8266 microcontreller with WiFi
  • ESPEasy firmware for ESP8266
  • Espressif memory flashing application for ESP8266
  • Node-Red

Here is the Java code:

File “App.java”:

package application.IoT_Application;

import java.util.UUID;

import org.eclipse.paho.client.mqttv3.IMqttToken;
import org.eclipse.paho.client.mqttv3.MqttAsyncClient;
import org.eclipse.paho.client.mqttv3.MqttException;

public class App

public static MqttAsyncClient myClient;

public static void main( String[] args ) throws MqttException

 myClient = new MqttAsyncClient("tcp://", UUID.randomUUID().toString());
 MyCallback myCallback = new MyCallback();

 IMqttToken token = myClient.connect();

 myClient.subscribe("/ESP-01_MQTT_client1/Input_Switch/On_Off_Value = ", 0);

File “MyCallback.java”:

package application.IoT_Application;

import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttMessage;

public class MyCallback implements MqttCallback

public void connectionLost(Throwable arg0)
// TODO Auto-generated method stub

public void deliveryComplete(IMqttDeliveryToken arg0)
// TODO Auto-generated method stub

public void messageArrived(String topic, MqttMessage message) throws Exception

App.myClient.publish(“/ESP-01_MQTT_client2/Output_Switch/On_Off_Value = “, message.getPayload(), 0, false);

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IoT using Eclipse Paho for Java, Mosquitto MQTT and ESP8266

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