Android as a digital signage platform

Android as a Digital Signage platform
Barcelona Android User Group October 2013

Hello world
Clients
Orange
El Corte Inglés
Endesa
Sodexo
Ikea
Nespresso
Fira Barcelona
Ajuntament de Barcelona
ESADE
The Phone House
The company
20 people
Digital Signage
User Interactivity
Projects
Spain
United Kingdom
Germany
Netherlands
Finland
www.focusonemotions.com
@focusonemotions

Hello world
Orestes Carracedo
8 years as a developer
4 years as an Android user
3,5 years at Focus On Emotions
Certified SCRUM Master
PHP 5.3 Zend Certified Engineer
Read about me
http://blog.orestes.io
Follow me
@orestesCA

Challenge
Break out of the player app and you’ll
get a reward
● Try to guess the unlock gesture
● Try to guess the unlock code
● No buttons
● No fastboot

Briefing
Make it on time
Code as less as possible
Be robust
Make use of existing OS tools
Make use of existing apps
Be flexible
Create multiple decoupled tools that work together

System architecture
Apache Cordova
V
P
N
BusyBox
A
D
B
S
S
H
JavaScript player
SuperSU
scheduler

Prototype
http://vimeo.com/72032877

Quick ADB recap
$ adb devices
List of devices attached
4df144cb39376f2f device # Over USB
192.168.1.42:5555 device # Over NET
$ adb shell echo “Hello world”
Hello world
$ adb -d shell ls /mnt/sdcard
$ adb -s 192.168.1.42:5555 shell ls /mnt/sdcard
Enable ADB over Wi-Fi
$ adb shell setprop service.adb.tcp.port 5555
$ adb shell stop adbd && start adbd # or you’ll be locked out
$ adb connect 192.168.1.42:5555

Quick ADB recap
Sending keys
$ adb shell input keyevent 3 # home
Starting activities
$ adb shell am start -n com.focusonemotions.android.player./Wrapper
Killing a process
$ adb shell killall com.focusonemotions.android.player
Installing apps
$ adb install foe-player-v1.1.apk
$ adb push foe-player-v1.1.apk /system/app
Android Monitor
<android-sdk>/tools/monitor
http://developer.android.com/reference/android/view/KeyEvent.html

Player
Cordova
Screen rotation
Read start URL
Provide OS access
JavaScript
Display content
Read content index file
Listen for gesture
Ask for code
Show config manager

Scheduler
Power management
$ reboot # (duh)
Screen state management
$ input keyevent 26 # power
$ input keyevent 82 # menu
Player state management
$ killall com.focusonemotions.android.player
$ am start -n com.[...].player/.Wrapper
http://developer.android.com/reference/android/view/KeyEvent.html

Restricted user access
● Kill UI process
● Custom launcher
AndroidManifest
<category android:name="android.intent.category.HOME" />
/system/build.prop
qemu.hw.mainkeys=1
● Custom ROM
http://thebitplague.wordpress.com/2013/04/05/kiosk-mode-on-the-nexus-7/

Local configuration manager
Content Index file
Player configuration file
Configuration manager
Content player

Static IP address
https://play.google.com/store/apps/details?id=de.schaeuffelhut.android.openvpn.installer
https://play.google.com/store/apps/details?id=de.blinkt.openvpn
$ openvpn --config /mnt/sdcard/focus/openvpn/conn.conf >
/mnt/sdcard/focus/openvpn/run.log &
$ cat /mnt/sdcard/focus/openvpn/conn.conf | grep resolv
resolv-retry infinite

Remote shell
$ adb connect 192.168.1.42:5555
$ time adb connect 192.168.1.42:5555
unable to connect to 192.168.1.42:5555
real 1m3.163s
user 0m0.000s
sys 0m0.020s
.
.
$ time timeout 9s adb connect 192.168.1.42
real 0m9.003s
user 0m0.000s
sys 0m0.020s

Screen capture
$ adb shell screencap /mnt/sdcard/focus/capture.png
$ adb pull /mnt/sdcard/focus/capture.png
$ ./capture.sh oratab-030-01
Getting screencap from oratab-030-01 ... done.

Wi-Fi management
$ echo "12345678" | wpa_passphrase "SSID"
# reading passphrase from stdin
network={
ssid="SSID"
#psk="12345678"
psk=34b59e6b0182725d42460 [...]
}
$ wpa_passphrase "SSID" "12345678" # may malfunction
$ wpa_passphrase "SSID" # may malfunction
# reading passphrase from stdin
Android Wi-fi/WPA settings
/data/misc/wifi/wpa_supplicant.conf

Content management
$ adb push /local/folder /remote/folder
PHP SFTP Wrapper
$ php load-device-content.php 300 7
Loading content …
50 % 20/40 KB
100 % 40/40 KB
Done.
/mnt/sdcard/focus
+ openvpn
+ player
+ scheduler
+ upload
- content
- october_2013
+ media

Statistics & graphs
Whisper database (updates to past data)
Carbon aggregation (Use an IP, not a hostname UDP is better than TCP, is off by default)
Graphite for rendering
$ /opt/graphite/bin/carbon-cache.py start --debug
$ echo ‘value.received’ `date +%s` | nc -w 1 127.0.0.1 2003
StatsD/statsite as aggregator/proxy (v8 nodejs vs C)
<?php StatsD::increment(‘com.focusonemotions.app.pushing’);
http://graphite.readthedocs.org/en/latest/
https://github.com/etsy/statsd/
https://github.com/armon/statsite

1. Plug device in
2. Enable ADB over USB
3. Launch script
4. Enter ID
5. Done!
Check
● PING
● SFTP
● SSH
● ADB
Platforming

$ sftp root@192.168.1.42:mnt/sdcard/focus
bash: /usr/libexec/sftp-server: No such file or directory
$ sftp -s /system/xbin/sftp-server root@192.168.1.42:mnt/sdcard/focus
sftp>
# quick fix
[adb] $ ln -s /system/xbin/sftp-server /usr/libexec/sftp-server
Install SuperSU + settings
Install BusyBox
Install DropBearSSH
Fix SFTP subsystem
Install player
Install scheduler
Install OpenVPN certificates from ID
Reboot
Platforming
http://www.chainfire.eu/projects/52/SuperSU/
https://play.google.com/store/apps/details?id=stericson.busybox
https://github.com/yath/android_external_dropbear

Monitoring with Nagios
$ php check-device-content.php 192.168.1.42
Up-to-date
$ php check-device-content.php 192.168.1.42
Out of date
http://nagios.sourceforge.net/docs/3_0/quickstart.html

Monitoring with Nagios
<?xml version="1.0" encoding="UTF-8"?>
<nagios_status>
<hosts>
<host name="dev-001">
<status last_change="2013-10-08T16:27:37+02:00">0</status>
<connectivity last_change="2013-10-08T16:27:37+02:00">0</connectivity>
<content last_change="2013-10-08T16:27:37+02:00">0</content>
<sftp last_change="2013-10-08T16:27:37+02:00">0</sftp>
</host>
[...]

www.focusonemotions.com
dev@focusonemotions
Thank you!
Feedback
orestes.ca@gmail.com
Team
Juanra Posada
Orestes Carracedo
Javier Morales
Dimas López
Raúl Jiménez
Javier Domingo
Gonzalo Rodríguez
Project Manager
Lead Developer
Developers
JavaScript Ninja
Sistemas

Android as a digital signage platform

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