TizenRT is an open source real-time operating system based on the Linux kernel that is optimized for Internet of Things and constrained devices. It originated from the TinyAra project and is now a full software stack that includes the NuttX real-time microkernel, POSIX compatibility libraries, and JavaScript support using IoT.js and the JerryScript engine. TizenRT provides developers with tools to write applications in native languages like C/C++ or using JavaScript for high-level APIs, and supports connectivity standards and protocols to enable seamless communication between devices. The project is maintained by an open community on GitHub in collaboration with Samsung.

1. Samsung Open Source Group 1 https://www.meetup.com/Rennes-Embedded/
JavaScript in constrained devices
Using :RT
with IoT.js
#RennesEmbedded
Rennes, France <2018-10-11>
Philippe Coval
Samsung Open Source Group / SRUK
p.coval@samsung.com

2. Samsung Open Source Group 2 https://www.meetup.com/Rennes-Embedded/
What do you know of ?
● Operating System powered by Linux Kernel
● Shipped into consumer electronics products
– TVs, Wearables, Home kitchen appliances…
● Tizen the OS of Everything?
– What about low-end and low-cost IoT devices?
● Note: uClinux is lowering requirements
– but not optimal so we need a dedicated kernel !
● TizenRT is targeting middle configurations (RAM+Flash):
– Cortex M3 (30KB+512KB), M4 (256KB+16MB), R4 (2MB+16MB)

3. Samsung Open Source Group 3 https://www.meetup.com/Rennes-Embedded/
TizenRT's origin
● TinyAra 2015 project to collect, store, and deliver IoT sensor data using:
– IoTivity for connectivity & AraStorage: Data management
– Sources released to public on tizen.org (SOSCON2016)
● It was based on NuttX RealTime kernel (deterministic and priorities)
– UNIX/Linux inspired OS (+shell +apps) comply to standards, POSIX, GNU tools
– Initial release in 2007, community led by main author Gregory Nutt
– Stable & Mature (2.5M LoC), 8 to 32 bits, ~20 archs, 200 boards (<16KB)
– BSD Licensed: Industry & community adoption
● TizenRT is the whole stack: TinyAra kernel + middlewares (TDC2017)

4. Samsung Open Source Group 4 https://www.meetup.com/Rennes-Embedded/
Tizen:RT Architecture
Current
status:
2.0_GBM_M1
+
~1000
patches

5. Samsung Open Source Group 5 https://www.meetup.com/Rennes-Embedded/
Tizen:RT plan for reliability
● Memory protection unit (MPU > MMU)
– User/Kernel separation
●
Per thread mem protection
● Micro kernel architecture
– Only for scheduling tasks, memory, IPC
● + user space services (Net, drivers...)
● Fault Tolerance
– Self healing
● restart services (and dependencies)
– Fallback option: Live update (DM)

6. Samsung Open Source Group 6 https://www.meetup.com/Rennes-Embedded/
Application development on Tizen:RT
●
Platform is supporting native development (POSIX)
– with optional middlewares:
– WiFi, LWIP port for IPv6, +LWM2M, CoAP, HTTP, DTLS, WebSockets, MQTT
– Wakaama (LWM2M) for device management
– IoTivity for seamless connectivity between devices
● But some (or most) applications
– Are not requiring low level primitives
● When high level API are available
– Need secured context
● For many developers
"Any application,
that can be written in JavaScript
will eventually be written in JavaScript."
~Jeff Atwood

7. Samsung Open Source Group 7 https://www.meetup.com/Rennes-Embedded/
“Simplicity
is the ultimate sophistication.”
~Leonardo da Vinci

8. Samsung Open Source Group 8 https://www.meetup.com/Rennes-Embedded/
IoT.js: platform powered by JerryScript engine
● JerryScript: A JavaScript interpreter
– Optimized for constrained devices: <64 KB RAM & <200 KB ROM
– Available in various RTOS: Tizen:RT, RIOT, Zephyr…
● IoT.js: Runtime environment
– Supports modules (built in)
● Timers, GPIO, ADC, I2C,UART
● UDP, HTTP, WebSockets, DNS, BLE
● Developer friendly environment:
– Develop using iotjs on GNU/Linux
– Port and deploy to constrained device
– Or even port modules (NPM)

9. Samsung Open Source Group 9 https://www.meetup.com/Rennes-Embedded/
“Any sufficiently
advanced technology
is indistinguishable
from magic.”
~ Arthur C. Clarke

10. Samsung Open Source Group 10 https://www.meetup.com/Rennes-Embedded/
Demo !
https://youtu.be/S7zpBpnpflU#tizen-rt-lpwan-20180204rzr
● https://my.wirelessthings.be/index.php/device/device_view/1229

11. Samsung Open Source Group 11 https://www.meetup.com/Rennes-Embedded/
Mozilla IoT & WebThings powered by ARTIK
https://youtu.be/qrFTn0eA8iQ#web-of-things-agriculture-20180712rzr
https://youtu.be/qrFTn0eA8iQ
web-of-things-agriculture-20180712rzr#

12. Samsung Open Source Group 12 https://www.meetup.com/Rennes-Embedded/
Summary
● Tizen is based on Linux kernel for high end devices
● Tizen ecosystem is now addressing more constrained IoT devices
– Tizen:RT was originally based on NuttX kernel,
● then evolved into micro kernel architecture
● Tizen:RT is open to application developers by providing
– Native, C, C++ POSIX standard libraries
– Javascript runtime, using IoT.js + JerryScript interpreter
● Open Community (github.com/Samsung) & Tools: SDK (CLI or IDE)

13. Samsung Open Source Group 13 https://www.meetup.com/Rennes-Embedded/
References
 Entry points:
– https://fosdem.org/2018/schedule/event/tizen_rt/
– https://wiki.tizen.org/Category:RT
– https://github.com/Samsung/TizenRT/
 Keep in touch online:
– https://s-opensource.org/author/philcovalsamsungcom/
https://wiki.tizen.org/wiki/Meeting
– https://wiki.tizen.org/wiki/Events
– https://wiki.tizen.org/wiki/FOSDEM
More:
● https://source.tizen.org/documentation/tizen-rt
● https://www.artik.io/modules/artik-05x/
● https://developer.artik.io/documentation/artik-05x/getting-started/
● http://www.nuttx.org/
● http://youtube.com/channel/UC0QciIlcUnjJkL5yJJBmluw
● https://www.slideshare.net/MyungJooHam/tdc-mjham-armkernelintizen3noani
● http://opensource.samsung.com/
Bonus tip:
for demo convenience
I am drafting demo recipes (WIP)
git clone https://github.com/rzr/TizenRT

14. 14Samsung Open Source Group
Thank you
https://wiki.tizen.org/wiki/User:Pcoval
BTW greetings to :
Resources: flaticons CC