You are closing the client down before the broker has time to send the message back.
Also you don't need 2 instance of the client, you can send and receive with just one.
I've edited your code a little, it now will continue to run and receive messages until you kill it.
import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
public class PahoDemo implements MqttCallback {
MqttClient client;
public PahoDemo() {
}
public static void main(String[] args) {
new PahoDemo().doDemo();
}
public void doDemo() {
try {
client = new MqttClient("tcp://192.168.118.11:1883", "Sending");
client.connect();
client.setCallback(this);
client.subscribe("foo");
MqttMessage message = new MqttMessage();
message.setPayload("A single message from my computer fff"
.getBytes());
client.publish("foo", message);
} catch (MqttException e) {
e.printStackTrace();
}
}
@Override
public void connectionLost(Throwable cause) {
// TODO Auto-generated method stub
}
@Override
public void messageArrived(String topic, MqttMessage message)
throws Exception {
System.out.println(message);
}
@Override
public void deliveryComplete(IMqttDeliveryToken token) {
// TODO Auto-generated method stub
}
}
EDIT: added the missing client.setCallback(this)