M2M for Java Developers
MQTT with Eclipse Paho

Dominik Obermaier
@dobermai
excited about M2M
passionate
Architect & Maker
loves OSS
Co-Founder and
CTO at dc-square
likes Open Source Hardware

Dominik Obermaier
@dobermai
excited about M2M
loves OSS
passionate
Architect & Maker
Co-Founder and
CTO at dc-square
likes Open Source Hardware
K
Who not?!?

M2M?

TECHNOLOGY THA
T
SUPPORTS WIRED
OR WIRELESS
COMMUNICA
TION
BETWEEN DEVICES

Why
should
we
care?

“Things” in the Internet
2010
2015
2020
~6.909.000.000
~7.302.000.000
~7.675.000.000
[1]
[2]
~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
[2]Source: http://share.cisco.com/internet-of-things.html

“Things” in the Internet
People
Things
50,000,000,000
37,500,000,000
25,000,000,000
12,500,000,000
0
2010
2015
2020

“Things” in the Internet
People
Things
50,000,000,000
37,500,000,000
25,000,000,000
1.8x
12,500,000,000
0
2010
2015
2020

“Things” in the Internet
People
Things
50,000,000,000
37,500,000,000
25,000,000,000
1.8x
3.4x
12,500,000,000
0
2010
2015
2020

“Things” in the Internet
People
Things
50,000,000,000
6.5x
37,500,000,000
25,000,000,000
1.8x
3.4x
12,500,000,000
0
2010
2015
2020

Things?

Another revolution?

Screenshot Taken from Oracle JavaOne Strategic Keynote 2013

IoT

Which
protocol
?

HTTP?
Request / Response
Verbose
Polling instead of Push
No quality of service
How to get notified if clients die?
Stateless

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 networks
K
Wireless? Yep, then it probably is unreliable

Publish / Subscribe

Broker Implementations

Broker Implementations

Broker Implementations

Broker Implementations

Broker Implementations

Broker Implementations

Broker Implementations
+ others

Broker Implementations
+ others
Extensive list of brokers available at http://mqtt.org/wiki/doku.php/brokers

Noooo! Sounds like
programming in C!

Java!

What is Paho?
✓ Scalable Open Source Implementations of M2M
standard protocols
✓ Focus on MQTT
✓ Implementations in Java, Javascript, Lua,
C, C++ and Python
✓ Eclipse Incubator

What is Paho?
K
Read: What is Paho at the moment
✓ Scalable Open Source Implementations of M2M
standard protocols
✓ Focus on MQTT
✓ Implementations in Java, Javascript, Lua,
C, C++ and Python
✓ Eclipse Incubator

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

Other Eclipse
M2M Projects
+ others

THANK
YOU!

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
✓ Paho Logo from http://wiki.eclipse.org/Paho/Branding