fxos for embedded systems (english version)

Firefox OS study group tokyo 9th

Firefox OS for Embedded System and Web APIs(English version)

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Self Introduction

Twitter: @masap Embedded System Engineer（mainly Wi-Fi）

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Table of contents

What is WoT ? Position of Firefox OS on WoT Add the Web APIs for Firefox OS Standardization of Web APIs

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What is WoT ?

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review

Today's thema is “Go for it WoT ”！ Review on WoT

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IoT (Internet of Things)

Connect various things to the Internet By computers on cloud

Summarize informations Control devices

Cloud

Things

Traffic accidentoccurredControl signals,

digital signage

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WoT (Web of Things)

Web = HTTP ？ IoT = IP、Web = HTTP no diferent→

Application

HTTP

IP

Things

Application

Things

IP

IoT WoT

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WoT (Web of Things)

Web = Browser？ We can write all with JavaScript

Browser

HTTP

IP

Things

WoT

ApplicationApplication

IP

Things

IoT

CC/Java

JavaScript

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Browser as a platform

“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

WoT means this

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Position of Firefox OS on WoT

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Should all the things run browser ?

Smart Endpoint vs Dumb Endpoint This question causes debates on IoT

Should the “Things” on IoT be intelligent ? Don' be involved in the debates. Make an layer

between them. Fog computing⇒

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

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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.

CloudComputing

FogComputing

Summarize data,Transform format, etc...

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Example of Fog Layer

Cloud

Things

Fog

Urban planning by AI

Fog

Things

Notify to neighborsAccidents statistics

Traffic accidentoccurredControl signals,

digital signage

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Fog Computing Products

Cisco Cisco proposes Fog Computing Cisco has “Cisco Iox” Fog Development Platform It's too expensive for almost companies

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Fog with Firefox OS

Firefox OS Fog with Firefox OS

Firefox OS has more hardware access Web APIs than Chrome、Safari、IE

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What is required for Fog ?

Hardware access via Firefox OS 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

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The way to control Things via Web (1)

Via Network HTTP, nodejs, WebSocket, WebRTC This way is already used

sensorFirefox OS

network

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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

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Add the Web APIs for Firefox OS

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What is Web API ?

“Web API” has two means Services on the Web

Twitter API、Youtube API、... JavaScript API on the Browser (I expect this today)

navigator.getUserMedia, navigator.geolocation, …

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Hardware access Web API

What will we create ? Create navigator.hardwareaccessxxx API like

navigator.getusermedia How to create new Web API ?

Modify Firefox

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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

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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

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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

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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

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Web GPIO API

Web GPIO API (part) navigator.requestGPIOAccess()

Get a GPIO access object gpio.ports.get(GPIO pin number)

Get a GPIO port object port.write(value)

Write to a port port.read()

Read from a port

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Web I2C API

Web I2C API (in progress) 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);

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Standardization of Web APIs

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Standardization

WoT is not only Gecko WoT with V8 or Trident

Standard way is required Web GPIO is discussed on W3C Browsers and

Robotics Community Grouphttp://www.w3.org/community/browserobo/

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Example of discussion

Promise vs Return value Promise

merit: async enabled demerit: deep nest

Return value merit: shallow nest demerit: async disabled

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end