Devoxx 2015 - Building the Internet of Things with Eclipse IoT

Building the
Internet of Things
with Eclipse IoT
Benjamin Cabé – Eclipse Foundation
@kartben
Devoxx France - April 10, 2015

Java for IoT?
● 9+ million Java developers
● Java 8 & embedded are fun
● Lots of IoT devices running on ARM
● Tooling

Talking to sensors?
● Pi4J – http://pi4j.com
○ Complete access to GPIOs/I2C/SPI
○ Very mature codebase, based on WiringPi
○ Support for popular shields (PiFace, Gertboard, …)
○ Lots of code samples

Talking to sensors?
Gp o on o e p o = Gp oFa o . e Ins an e();
Gp oP nD a Ou pu p n = p o.p o s onD a Ou pu P n(
Rasp P n.GPIO_01, "M LED", P nS a e.HIGH);
Th ead.s eep(5000);
p n. ow();
Th ead.s eep(5000);
p n. o e();
p o.shu down();

Gateway
Connect
sensors to the world
Manage the hardware
and software running
at the edge

Connect?
● CoAP
○ « HTTP over UDP »
○ Expose your device as a resource to the Internet of
Things
● MQTT
○ Publish/Subscribe model
○ More room for local processing

CoAP: The web-of-things
/walk
/hand/left/raise
/eye/picture
/on
/red
/green
/blue
/mtbf
/on
/on
/buttons
/buttons/1/push
/bat-level
/engine/status
/position
/fuel
/CO2
/noise
/lights/on

Eclipse Californium
● Focus on scalability and usability
● To be used in IoT cloud servers or M2M/IoT
devices running Java
● Includes DTLS implementation (Scandium),
HTTP/CoAP bridge, Plugtests, …
http://eclipse.org/californium

import static org.eclipse.californium.core.coap.CoAP.ResponseCode.*;
public class MyResource extends CoapResource {
@Override
public void handleGET(CoapExchange exchange) {
exchange.respond("hello world"); // reply with 2.05 payload (text/plain)
}
@Override
public void handlePOST(CoapExchange exchange) {
exchange.accept(); // make it a separate response
if (exchange.getRequestOptions() ...) {
// do something specific to the request options
}
exchange.respond(CREATED); // reply with response code only (shortcut)
}
}

MQTT: Publish & Subscribe
Sub
KETTLE232/#Pub
KETTLE232/temp
Payload:
21°C
Pub
KETTLE232/temp
Payload:
21°C
BROKER

Eclipse Paho
● Open-source MQTT clients
● Pick your language!
○ Java
○ JavaScript
○ C/C++, Objective C
○ Go, Lua, Python, .NET, WinRT, …
http://eclipse.org/paho

MqttClient c = new MqttClient("tcp://m2m.eclipse.org:1883",
MqttClient.generateClientId());
mqttClient.setCallback(new MqttCallback() {
@Override
public void messageArrived(String topic, MqttMessage message)
throws Exception {
// process received message
// ...
}
});
mqttClient.connect();
mqttClient.subscribe("mygateway/#");

MQTT brokers
● Eclipse Mosquitto
○ C implementation
○ Scalable (1000 clients == 3MB RAM)
● Eclipse Moquette
○ Java implementation
○ Based on Netty and LMAX disruptor

Manage?
● Gateway itself
○ wireless modem, firewall, …
● Applications
○ Install/Uninstall software packages
○ Start/Stop applications
● Sensors
○ H/W abstraction layer

Java VM
OSGi Application Container
Device Abstraction
Gateway Basic Services
Network Configuration
Network Management Field
Protocols
Connectivity and Delivery
AdministrationGUI
Operation&Management
Linux
Hardware
App 1 App 2 App n. . . .
Applications
Eclipse Kura

Installing Kura
cd ~
sudo apt-get update
wget https://s3.amazonaws.com/kura_downloads/raspbian/release/
1.1.0/kura_1.1.0_raspberry-pi_armv6.deb
sudo dpkg -i kura_1.1.0_raspberry-pi_armv6.deb
sudo apt-get install -f
sudo reboot

First steps with Kura
● Network management
○ Cellular Modem, WiFi
○ Firewall
○ NAT
● OSGi and system administration
● IoT server communication settings

Kura API
● OSGi services that you can re-use in your own
components
○ o Se e
○ Da aSe e, oudSe e
○ p oSe e (AES, base64, SHA-1)
○ Pos onSe e (geolocation)
○ … and many others
● And of course you can leverage a huge
ecosystem of Java and OSGi libraries

Your typical Kura component
● Uses Modbus, CAN-Bus, etc. built-in device
abstraction services
○ Or implement your own service

Your typical Kura component (2)
• Uses Kura built-in transport services to talk to
the cloud
– TransportService – « raw » protocol
– DataService – local storage, auto reconnect
– CloudService – optimized binary payload, advanced
device management

• Implements ConfigurableComponent
– Enables configuration from the UI
– … as well as from the cloud

• Bundled with other bundles/components in a
deployment package
– Zip file containing a Manifest & OSGi bundles
• Can be deployed from Kura Web UI or over the air
Read more:
http://eclipse.github.io/kura/doc/kura-setup

End-user interaction
● JavaFX Charts
● Eclipse BIRT
● Smartphone app (e.g Android)
○ https://www.eclipse.org/paho/clients/android
● MQTT + WebSockets = ♡
○ https://www.eclipse.org/paho/clients/js

Kura is awesome!
Go download it now!
http://eclipse.org/kura
If you had to remember only 3 things...
#1

Build your own greenhouse &
follow the tutorial
http://iot.eclipse.org/java/tutorial
#2

Eclipse IoT is much more than
Kura and Java!
http://iot.eclipse.org/
#3

Get Involved!
● Open bugs / fix bugs
● Request new features
● Write articles, tutorials
● Participate on the mailing
lists
● Propose your project!

Coming next?
● Device Management
○ LwM2M, LwM2M over MQTT, IPSO Smart Objects
● Security
○ TinyDTLS
● Open-source IoT server?
○ Several members interested in defining and
implementing the OpenStack for IoT

Thank you! Questions?
benjamin@eclipse.org
@kartben
http://iot.eclipse.org

Devoxx 2015 - Building the Internet of Things with Eclipse IoT

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