M2M for Java Developers - MQTT with Eclipse Paho

M2M for Java DevelopersMQTT with Eclipse Paho

17-07-2013 -- #democampstuttgartDominik Obermaier -- dc-square GmbH

Dominik Obermaier@dobermai

MQTT Enthusiastloves OSS

passionateArchitect & Maker Co-Founder dc-square

likes Open Source Hardware

Dominik Obermaier@dobermai

MQTT Enthusiastloves OSS

passionateArchitect & Maker Co-Founder dc-square

likes Open Source HardwareK Who not?!?

M2M?

TECHNOLOGY THAT SUPPORTS WIRED

OR WIRELESS COMMUNICATION

BETWEEN DEVICES

Why should

we care?

2010 2015 2020

~6.909.000.000 ~7.302.000.000 ~7.675.000.000

~12.500.000.000 ~25.000.000.000 ~50.000.000.000

[1]Source: http://www.un.org/esa/population/publications/wpp2008/wpp2008_highlights.pdf

[1]

[2]Source: http://share.cisco.com/internet-of-things.html

[2]

“Things” in the Internet

Things?

Which protocol

?

Why MQTT?✓ Simple

✓ Efficient

✓ Publish / Subscribe

✓ Quality of Service Levels

✓ Last Will and Testament

✓ Designed for unreliable networks

Why MQTT?✓ Simple

✓ Efficient

✓ Publish / Subscribe

✓ Quality of Service Levels

✓ Last Will and Testament

✓ Designed for unreliable networksK Wireless? Yep, then it probably is unreliable

Publish / Subscribe

OMG! Sounds like programming in C!

What about Java?

What is Paho?

✓ Scalable Open Source Implementations of M2M standard protocols

✓ Focus on MQTT

✓ Implementations in Java, Javascript, Lua and C

✓ Eclipse Incubator

What is Paho?

✓ Scalable Open Source Implementations of M2M standard protocols

✓ Focus on MQTT

✓ Implementations in Java, Javascript, Lua and C

✓ Eclipse Incubator

KRead: What is Paho at the moment

Code! public void start() throws Exception { final String clientId = "eclipse_stuttgart_sub";

final MqttClient mqttClient = new MqttClient(BROKER_URL, clientId, new MemoryPersistence());

mqttClient.setCallback(new SubscribeCallback(mqttClient));

mqttClient.connect();

mqttClient.subscribe(TOPIC_SUBSCRIPTION, QUALITY_OF_SERVICE_LEVEL);

}

Moar Code!public class SubscribeCallback implements MqttCallback {

@Override public void connectionLost(Throwable cause) {}

@Override public void deliveryComplete(MqttDeliveryToken token) {}

@Override public void messageArrived(MqttTopic topic,

MqttMessage message)throws Exception {

System.out.println("Message arrived. Topic: "

topic.getName() + ", QoS: " + message.getQos() + ", message: " + new String(message.getPayload(), Charset.forName("UTF-8")));

}}

DEMO!

Other Eclipse M2M Projects

Credits✓ Scared Cat Picture by http://www.flickr.com/photos/dat-pics/

✓ Thanks Vincent Le Moign for the awesome Icon Set

✓ Rest of pictures licensed from different people from 500px.com

✓ MQTT Logo by http://www.mqtt.org