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Contents
OCF & IoTivity 개요- About OCF- About IoTivity
How to Build IoTivity Application- IoTivity Application Programming Procedure- Building IoTivity- Structure of IoTivity Application
OCF & IoTivity 개요• About OCF & IoTivity …
Why OCF?
Dilemma of current IoT world- Fragmentation, Fragmentation, Fragmentation !! (No universal language
for IoT)- Device maker
Limiting market, increasing costs- End users
Always check compatibility & interoperability
OCF’s mission- Bring “OCF products” to the market
Provides “Specifications”, “Codes”, “Certification program”- Make end users’ experience better
Seamless bridging to other ecosystems
OCF Members
Over 300 member companies…- Diamond members- Platinum members- Gold members- Nonprofit/academic members- Basic members
Three Pillars – OCF Approach
Specification- Defines OCF framework including standard model for IoT devices, apps, &
services to interact Stop fragmentation and increase device orchestration by creating a common
standard for IoT device connectivity
IoTivity Open Source- Delivers reference implementation of OCF framework & translation layers
for non-OCF devices Ease developers’ burden
Certification- Ensures interoperability via compliance and interop testing
Scope of OCF Framework
From OCF Overview, Matt Perry
OCF Resource
What is OCF resource?- In OCF world, entities are modeled as “Resource”- Entities :
Virtual object (e.g. data, logical state) Physical object (e.g. sensor, actuator)
How OCF resource is described?- Identifier: Resource Type (e.g. oic.r.temperature)- Properties: type, name, value - Resource is described in “json file”
How OCF resource is accessed?- Use URI: ocf://<authority>/<path> (e.g. ocf://192.168.1.1/room/light )
How to manipulate resource?- Use RESTful API (CRUDN: Create, Retrieve, Update, Delete, Notify)- Operations for resource is descried in “RAML file”
OCF Resource – schema example
oic.r.temperature.json
OCF Resource – RAML example
temperature.raml
OCF Resource – where can I find this info?
oneIoTa- OCF’s standardized data model repository- http://www.oneiota.org- “Schema in json” & “API in RAML” for OCF resource- E.g.) temperature
https://www.oneIoTa.org/documents?q=temperature Schema: https://www.oneIoTa.org/revisions/2358 API: https://www.oneIoTa.org/revisions/2190
File materials- https://github.com/OpenInterConnect/IoTDataModels
OCF application protocol
OCF adopted RESTful API- 2 Roles (Client, Server) & - 2 Messages (Request, Response) & - 5 operations (CRUDN)
OCF Client: A logical entity that accesses a Resource on a Server- Initiates a transaction (send a request)
OCF Server: A logical entity that exposes hosted Resources- Hosts resources- Sends response
CRUDN operation - Implemented over CoAP (The Constrained Application Protocol, RFC7252) by default- Delivered over UDP by default
Payload encoding- CBOR (Concise Binary Object Representation, RFC7049) is used by default
client server R
Putting all together
IoTivity
One of 3 pillars of OCF- Implement reference implementation of OCF specifications- Open source project hosted by Linux Foundation- Apache ver 2.0 license
Features- Resource / Endpoint Discovery (based on CoAP/Multicast)- Communication (RESTful API on CoAP) with Security (DTLS)- Supports various connectivity (Wifi, Eth, BT, BLE, NFC…)- Supports various OS (Linux, Android, Tizen, Windows…)- Supports various service (Mini Plugin Manager, Simulator, CoAP-HTTP
proxy…)
IoTivity information repository- https://wiki.iotivity.org
IoTivity Protocol Stack
Connectivity Layer
Resource Layer
Application Layer
Wifi, Ethernet, Bluetooth, zigbee, z-wave…TCP, UDP over IP
Session protection (DTLS)Session management (CoAP)
Core resourcesSecurity resources
Security Resource Manager (SRM)
Application specific resources
OCF Client OCF Server OCF bridge
How to Build IoTivity Application• IoTivity Application Programming Procedure
• Building IoTivity
• Structure of IoTivity Application
Procedure of IoTivity App Programming
Step 1. Identify required Things (devices)
Step 2. Find “OCF Resource Standard Model” for Things- http://www.oneiota.org
Step 3. Choose Platform & Connectivity Technology- Linux, Windows, Android …- Wifi, Ethernet …
Step 4. Coding main logic- Server- Client
Building IoTivity
Getting sources- Clone GIT repository from IoTivity directly
(https://www.iotivity.org/documentation/linux/getting-started)- Get from GitHub mirror (https://github.com/iotivity/iotivity)- Get tarball from IoTivity site (https://www.iotivity.org/downloads)
How to build IoTivity - https://wiki.iotivity.org/build_for_your_system
SCONS, build tool- A python-based software construction tool, easier than autoconf/automake- Get document (http://scons.org/documentation.html)- Get instant help
scons -h scons TARGET_OS=linux –h /* get context-aware help */ scons –c /* clean up */
- Example: scons TARGET_OS=linux TARGET_TRANSPORT=IP TARGET_ARCH=x86_64
LOGGING=true BUILD_SAMPLE=ON Generally, “scons <enter>” is ok
Building IoTivity (cont’d)
Where is Binaries?- /<IoTivity source folder>/out/<TARGET_OS>/<TARGET_ARCH>/release
E.g) /iotivity/out/linux/x86_64/release
Where is Samples?- /<IoTivity source folder>/out/<TARGET_OS>/<TARGET_ARCH>/release/
resource/examples- /<IoTivity source folder>/out/<TARGET_OS>/<TARGET_ARCH>/release/
resource/csdk/stack/samples
APIs for IoTivity application- C++ API (1)
For rich device (i.e. Linux) Examples: ./resource/examples
- C API (2) For constrained device (i.e. arduino) Examples: ./resource/csdk/stack/samples
Application
Structure of IoTivity Application –Initialization
From Prototyping IoT devices on GNU/Linux, Philippe Coval
Structure of IoTivity Application –Registration of resource on server
From Prototyping IoT devices on GNU/Linux, Philippe Coval
Structure of IoTivity Application –Resource Discovery (1)
From Prototyping IoT devices on GNU/Linux, Philippe Coval
Structure of IoTivity Application –Resource Discovery (2)
From Prototyping IoT devices on GNU/Linux, Philippe Coval
Structure of IoTivity Application –Discovering from client
From Prototyping IoT devices on GNU/Linux, Philippe Coval
Structure of IoTivity Application –GET/POST using entity handler
From Prototyping IoT devices on GNU/Linux, Philippe Coval
Any questions?
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