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IoT Frontends with Apache Flex
Christofer Dutz <christofer.dutz@codecentric.de>
ApacheCon EU 2016 - Seville - 2016-11-16
ABOUT ME
Christofer Dutz
Senior IT Consultant
codecentric AG
Apache Member
Apache Flex Committer & PMC
Flexmojos Lead Developer
Open-Source enthusiast
1
AGENDA
What do we need?
What parts of Apache Flex can help?
Why is Flex so great for IoT?
Demo
2
WHAT DO WE NEED?
Server application a client can talk to
Client that talks to the server
Logic on the server that talks to the IoT hard/software
4
3
WHAT PARTS OF APACHE FLEX
CAN HELP?
BlazeDS as communication endpoint to any client
Flex client as frontend
5
WHY IS FLEX SO GREAT FOR IOT?
6
ON THE SERVER
BlazeDS-Spring-Boot-Starter
Automatically configures the BlazeDS server
Using Spring-Flex for configuring the details
Activated by providing a "META-INF/flex/servicesconfig.xml"
ON THE SERVER
BlazeDS
Server-Push
Remoting (call method on server)
Messaging (JMS-Like publish-subscribe)
JMS integration possible
Automatic serialization/deserialization
Strongly typed
7
ON THE SERVER
Spring-Flex
Make Spring bean accessible by annotating with
@RemotingDestination
Takes care of configuring BlazeDS for Spring
Integrates BlazeDS into Spring
Spring Messaging
Spring Security
… 8
ON THE CLIENT
Strongly typed model
Client-Side model auto-generated from server model
Framework handles the communication details
automatically
Deployable as native application on Android and IOs
devices
Skinning
9
CLIENT-SERVER COMMUNICATION
EXAMPLE
10
11
ON THE SERVER
package de.codecentric.iot.rapiro.movement;
import de.codecentric.iot.rapiro.movement.model.MovementState;
import org.springframework.flex.remoting.RemotingDestination;
import org.springframework.stereotype.Service;
@Service("movementService")
@RemotingDestination
public class MovementService
{
private MovementState movementState;
public void stop() {
// Do something
}
public void moveForward() {
ON THE CLIENT
Declaration of the remote service incl. methods and
callbacks
<s:RemoteObject id="movementService"
destination="movementService"
fault="onFault(event)">
<s:method name="stop" result="onResult(event)"/>
<s:method name="moveForward" result="onResult(event)"/>
<s:method name="getMovementState" result="onGetMovementStateResul
</s:RemoteObject>
12
ON THE CLIENT
Calling the remote methods
<s:Button click="onStopClick(event)" label="Stop"
enabled="{enabled}"/>
protected function onStopClick(event:MouseEvent):void {
movementService.stop();
}
protected function onResult(event:ResultEvent):void {
// Handle the result.
}
protected function onFault(event:FaultEvent):void {
// Handle the error.
}
13
BEHIND THE SCENES
14
SKINNING
Component + Skin
Component = functional implementation of control
Skin = visual representation (incl. UI logic)
Not only for positioning as with CSS in JS/HTML
Different usability on touch and desktop
15
DEMO OF THE ROBOT
17
16
HARDWARE DETAILS
Arduino Uno handling the Movement
Pixy (CMUcam5) handling processing of the image data
IR Distance sensor
Raspberry PI 3 communicating with all of the subsystems
64 bit Quad Core ARM Cortex-A53
WiFi access point, 32GB SD flash memory, 1GB Ram
PAM8403 based audio amplifier
SOFTWARE DETAILS
OS: Raspbian
Oracle Java 1.8 JDK
Scala 2.11.8
Jetty-based Spring-Boot application
Spring 4.3.2.RELEASE
Spring-Boot 1.4.1.RELEASE
Spring-Flex 1.5.2.RELEASE
Spring-Scala 1.0.0.M2
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SOFTWARE DETAILS (CONTINUED)
PI4J 1.1 (lib for accessing RP devices)
BlazeDS 4.7.3-SNAPSHOT (for client communication)
Akka 2.4.11 (for higher "brain" functions)
Sources available on Github at:
https://github.com/chrisdutz/RAPIRO
19
IMPRESSIONS
21
20
ARDUINO
CAD DESIGNING THE CAM
CARRIER
22
PRINTING THE CAM CARRIER
23
MOUNTED CAM
24
PIXY IN ACTION
25
FINISHED PARTS
26
THE END
27