I use library paho for connectivity with mqtt broker, sending messages and almost everything work fine, but i have problem with setTimeToWait() method. it does not metter how many milliseconds i put into method setTimeToWait(2000) or setTimeToWait(10). I always get messages from publiusher.
Why can i get messages within the hours? If i set waiting time 2000 milliseconds. I thought after 2 secs absence of messages from publisher my subscriber cannot get messages from publiser and control will be returned.
What Am i doing wrong?
Publisher code:
public class MqttPublishSample {
public static void main(String[] args) throws MqttException {
String messageString = "{\"device_status\": \"ready\"}";
if (
args.length == 2 ) {
messageString = args[1];
}
System.out.println("== START PUBLISHER ==");
MqttClient client = new MqttClient("tcp://localhost:1883" , MqttClient.generateClientId());
client.connect();
MqttMessage message = new MqttMessage();
message.setPayload(messageString.getBytes());
message.setQos(1);
client.publish("/catalog", message);
System.out.println("\tMessage '"+ messageString +"' to 'iot_data'");
client.disconnect();
System.out.println("== END PUBLISHER ==");
}
}
Subscriber code:
public class MqttSuscribeSample {
public static void main(String[] args) {
System.out.println("== START SUBSCRIBER ==");
try{
MqttClient client=new MqttClient("tcp://localhost:1883", MqttClient.generateClientId());
client.setTimeToWait(2000);
client.setCallback( new SimpleMqttCallback() );
client.connect();
client.subscribe( "/catalog");
}catch (Exception ex){
ex.printStackTrace();
}
}
}
SimpleMqttCallback code
public class SimpleMqttCallback implements MqttCallback {
public void connectionLost(Throwable throwable) {
System.out.println("Connection to MQTT broker lost!");
}
public void messageArrived(String s, MqttMessage mqttMessage) throws Exception {
System.out.println("Message received:\t"+ new String(mqttMessage.getPayload()) );
}
public void deliveryComplete(IMqttDeliveryToken iMqttDeliveryToken) {
}
}
