Tilmann Scheller introduces IoT.JS, an open source, lightweight, JavaScript engine for the Internet of Things.

1. 1Samsung Open Source Group
Introduction to IoT.js
Tilmann Scheller
Senior LLVM Compiler Engineer
t.scheller@samsung.com
Samsung Open Source Group
Samsung Research UK
FOSDEM 2016
Brussels, Belgium, January 30 – 31, 2016

2. 2Samsung Open Source Group
Overview
● Introduction
● Demo
● Questions

3. 3Samsung Open Source Group
Introduction

4. 4Samsung Open Source Group
What is IoT.js?
● A lightweight version of Node.js
● Attempt to bring the success of Node.js to the embedded
world
● Retains backwards compatibility with Node.js as much as
possible
● Mostly written in JavaScript
● Runs on top of JerryScript

5. 5Samsung Open Source Group
What is JerryScript?
● An extremely lightweight JavaScript engine
● Written from scratch by Samsung
● Designed to run on heavily resource-constrained
microcontrollers
● Has a base RAM footprint of 10KB
● Not just a JavaScript subset: Implements the full ECMAScript
5.1 standard
● Written in C
● Binary size is around 200KB (compiled for ARM Thumb-2)

6. 6Samsung Open Source Group
Why JavaScript on microcontrollers?
● There's a huge pool of JavaScript developers
● Opens up the possibility for web developers to easily
write software for embedded devices
● Performance overhead of JavaScript less of an issue for
control tasks
● Increased productivity

7. 7Samsung Open Source Group
Open source
● Actively developed on GitHub
● JerryScript and IoT.js are both open source released
under the Apache 2.0 license
● Feature-complete, supports the full ECMAScript 5.1
standard
● Looking for bug reports and feedback
● More information on http://www.jerryscript.net and
http://www.iotjs.net

8. 8Samsung Open Source Group
SunSpider 1.0.2 - Memory consumption
3d-cube
access-binary-trees
access-fannkuch
access-nbody
bitops-3bit-bits-in-byte
bitops-bits-in-byte
bitops-bitwise-and
bitops-nsieve-bits
controlflow-recursive
crypto-aes
crypto-md5
crypto-sha1
date-format-tofte
date-format-xparb
math-cordic
math-partial-sums
math-spectral-norm
string-base64
string-fasta
0 100 200 300 400 500 600 700
108
84
40
44
36
36
36
160
228
132
192
132
76
72
40
36
44
172
48
216
240
160
172
160
160
160
384
204
268
420
304
572
220
164
160
164
324
172
JerryScript
Duktape 1.4
Max RSS in KB (lower is better) Measured on a Raspberry Pi 2

9. 9Samsung Open Source Group
Demo
● Implementation of the classic Pong game
● Display shared across two devices
● Each device drives one LED matrix
● Implemented as a Node.js module
● "AI" oppenent running on the microcontroller

10. 10Samsung Open Source Group
Demo
Raspberry Pi 2
(1GB RAM, 8GB Flash)
Pong Client
Node.js
V8
Linux
STM32F4 board
(192KB RAM, 1MB Flash)
Pong Server
IoT.js
JerryScript
NuttX
Ethernet
USB Keypad
LED Matrix LED Matrix
I2C I2C

11. Thank you.
11Samsung Open Source Group

12. 12Samsung Open Source Group
Contact Information:
Tilmann Scheller
t.scheller@samsung.com
Samsung Open Source Group
Samsung Research UK