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1. IoT : The Alarm Clock

2. 2
Adrien Leravat
Presentation
Witekio
• Germany, France, US, Taiwan
• System / ecosystem
• BSP & drivers, embedded & mobile software

3. 3
Internet of What ?
• Attributes
– Devices, Communicating.
– Acquire data, can grow, intelligent
• Vague but powerful
– Car, home, town
• New challenges
– Networks, Energy consumption, Security

4. 4
Key points
Your own components
• This is about
– Highlighting IoT important keys
– Qt in the picture
• IoT devices
• Security
• Into the clouds
• Let there be light !

5. IoTdevices
Embedded Qt

6. 6
Embedded
• Our Alarm-clock
– NXP i.MX6 DualLite
– Linux 3.10, Yocto 1.5
• Connectivity is key
• Medium / Long range
– Networks, Energy consumption, Security
• Short range
– BT, BTLE, NFC, RFID
• Even ‘’Cables’’!

7. 7
IoT Sytem Topology
Sensors
- No CPU
- Acquire data
Devices
- ARM
- Screen
- Qt
iMX6
Gateway/Broker
- ARM/x86
- Screen
- Qt
Cloud
- x86/64
- Qt
  Size of Qt

8. 8
Qt’s role
• For graphical applications
– Qt Quick / Widgets
– Depends on GPU, RAM and GUI’s complexity
• For non-graphical applications
– Leverage Qt classes (Networking, Files, DB, …)
– Sharing code, good performances
– Consider alternatives for heavy duty remote
services

9. Polishing with effectsSecurity
Keep it safe

10. 10
Security
• No one is ‘’safe’’
– Growing number of connected devices, means more
opportunities for hackers
– Shodan: IoT device search engine

11. 11
Security
• System
– Keep it up to date (packages)
– Remove development and unused services
– Firewall
– Security enhancements
– Seal the box

12. 12
Security
• Encrypt communications
– QSslSocket: TCP socket with SSL/TLS (requires
OpenSSH)
– Manually:
• Simplecrypt (Qt), OpenSSH, Crypto++
• Check input data
– Avoid strings when possible
– QString::toHtmlEscaped/replace, QRegExp
– QSqlQuery::bindValue

13. Make them talk
Into the clouds

14. 14
Example use cases
• Save user alarms and settings
• Set alarms from Smartphone
• News and weather
• Intelligent wake up
– Depending on traffic, weather

15. 15
Cloud services
• Cloud services / dedicated server
– Storage
• User settings, alarms
– Computing
• Traffic and weather, analysis
• Interface
– HTTP + JSON/XLM
• Very easy for Web applications
– Authentication

16. 16
Cloud services
Third party service
– Weather, news
Our server
– User preferences, Alarms
– Qt Cloud Services,
Amazon, etc
• QNetworkAccessManager
– HTTP Get/Post/Put
– QNAM::get(QNetworkRequest(QUrl(“http://myserver.com”);
– QJsonDocument, QDomDocument (XML)
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17. 17
Cloud services
Sorry I lied…
Gateway device / server
– To third-party services
– Access control
– Formatting
– Caching
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18. 18
Context
Qt Approved

19. Let there be light!
…but thanks to Qt

20. 20
Adding a light
• Light
– Wifi connected
– Brightness, color
– QUdpSocket on a fixed IP address
– Power on when an alarm rings

21. 21
Notifications
• Remote alarm
– Server has something to say ! “Push notification”
– Device listens on a specific TCP port
– Only accepts connections from server, QHostInfo
QTcpServer server;
server.listen(host, port);

22. 22
IoT Flexibility
?
Sensors Devices Gateway Cloud
• What if more ? New devices ?
– Like a Coffee machine
– … need for flexibility
– Broadcast yourself

23. 23
IoT Flexibility
?
Sensors Clients Broker Client(s)
• What if more ? New devices ?
– Centralizes information
– Clients publish events (temp., lights on, etc.)
– Clients subscribe to events
– MQTT (qmqtt, mosquitto), AMQP, XMPP …