Fxos for Embedded Systems (English version)

1. Firefox OS study group tokyo 9th
Firefox OS for Embedded System and Web APIs
(English version)

2. 2/31
Self Introduction

Twitter: @masap

Embedded System Engineer（mainly Wi-Fi）

3. 3/31
Table of contents
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What is WoT ?

Position of Firefox OS on WoT

Add the Web APIs for Firefox OS

Standardization of Web APIs

4. 4/31
What is WoT ?

5. 5/31
review

Today's thema is “Go for it WoT ”！

Review on WoT

6. 6/31
IoT (Internet of Things)

Connect various things to the Internet
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By computers on cloud

Summarize informations

Control devices
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Cloud
Things
Traffic accident
occurredControl signals,
digital signage

7. 7/31
WoT (Web of Things)

Web = HTTP ？

IoT = IP、Web = HTTP no diferent→

Application
HTTP
IP
Things
Application
Things
IP
IoT WoT

8. 8/31
WoT (Web of Things)

Web = Browser？

We can write all with JavaScript

Browser
HTTP
IP
Things
WoT
ApplicationApplication
IP
Things
IoT
C
C/Java
JavaScript

9. 9/31
Browser as a platform
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“Web = Browser” is more acceptable

Accessing to things and connection to the network
could be done via Browser

JavaScript can control things and HTTP protocol

At the standard IoT, almost things will be controlled
with native languages (like C)

⇒Browser as a platform
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WoT means this


10. 10/31
Position of Firefox OS on WoT

11. 11/31
Should all the things run
browser ?
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Smart Endpoint vs Dumb Endpoint
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This question causes debates on IoT
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Should the “Things” on IoT be intelligent ?

Don' be involved in the debates. Make an layer
between them. Fog computing⇒
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Smart Endpoint Dumb Endpoint
Unintelligent
- Pass the raw data to upper layer
- Do ordered actions
Intelligent
- Pass the summarized data
to upper layer
- Acts autonomously

12. 12/31
What is Fog Computing

Create a Fog Layer between Cloud and Things
Cloud
Things
Cloud
Things
Fog
Data reception server, Database,
Statistical Analytics Server, etc...
temperature, accelerometer,
Geiger-Müller counter, other sensors.
Cloud
Computing
Fog
Computing
Summarize data,
Transform format, etc...

13. 13/31
Example of Fog Layer
Cloud
Things
Fog
Urban planning by AI
Fog
Things
Notify to neighbors
Accidents statistics
Traffic accident
occurredControl signals,
digital signage

14. 14/31
Fog Computing Products
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Cisco

Cisco proposes Fog Computing

Cisco has “Cisco Iox” Fog Development Platform
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It's too expensive for almost companies

15. 15/31
Fog with Firefox OS
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Firefox OS
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Fog with Firefox OS

Firefox OS has more hardware access Web APIs than
Chrome、Safari、IE

16. 16/31
What is required for Fog ?
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Hardware access via Firefox OS
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Firefox OS is built with Web Technology

There is no mechanism like the Android NDK

Can not use native language

Hardware control with JavaScript is required

17. 17/31
The way to control Things via
Web (1)
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Via Network

HTTP, nodejs, WebSocket, WebRTC

This way is already used
sensorFirefox OS
network

18. 18/31
The way to control Things via
Web (2)

Control locally

Without network connection

There is not any path for this
⇒ Let them make API
⇒ Create new Web APIs !
sensor
Direct connectionFirefox OS

19. 19/31
Add the Web APIs for Firefox OS

20. 20/31
What is Web API ?
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“Web API” has two means
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Services on the Web
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Twitter API、Youtube API、...
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JavaScript API on the Browser (I expect this today)
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navigator.getUserMedia, navigator.geolocation, …

21. 21/31
Hardware access Web API
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What will we create ?

Create navigator.hardwareaccessxxx API like
navigator.getusermedia
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How to create new Web API ?
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Modify Firefox

22. 22/31
Modify Firefox

On Firefox, Gecko implements Web APIs

So will add some new code to Gecko to create some new
Web APIs

gecko/dom/geolocation etc...
Gecko
Web Application
Web API

23. 23/31
Required Web API

Popular hardware for IoT

input: sensor

output: motor

Such hardwares has GPIO or I2C interface

Create Web API for GPIO and I2C

24. 24/31
What is GPIO ?

What is GPIO ?

General Purpose Input/Output

Pins connects computers and peripherals

Configure on/of or read on/of of specific pin

Control on/of of LEDs or motors

25. 25/31
What is I2C ?

What is I2C ?

Bus for serial communication

Enables you to read/write a value

GPIO deals only on/of

Almost sensors and motors has this interface

26. 26/31
Web GPIO API
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Web GPIO API (part)
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navigator.requestGPIOAccess()
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Get a GPIO access object
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gpio.ports.get(GPIO pin number)

Get a GPIO port object
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port.write(value)

Write to a port
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port.read()

Read from a port

27. 27/31
Web I2C API

Web I2C API (in progress)
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navigator.requestI2CAccess(device_name,address)

Get an I2C device access object

i2c_device.write/read(register address, value);

Write to a register, read from a register

example

Drive a motor with DRV8830
var i2c_device =
navigator.requestI2CAccess("/dev/i2c-1", 0x64);
i2c_device.write(0x00, 0xfd);

28. 28/31
Standardization of Web APIs

29. 29/31
Standardization
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WoT is not only Gecko

WoT with V8 or Trident

Standard way is required

Web GPIO is discussed on W3C Browsers and
Robotics Community Group
http://www.w3.org/community/browserobo/

30. 30/31
Example of discussion
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Promise vs Return value
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Promise
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merit: async enabled

demerit: deep nest
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Return value

merit: shallow nest

demerit: async disabled

31. 31/31
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