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Embedded Software Lab. @ SKKU 15 1 Sungkyunkwan University Tizen/Artik IoT Practice Part 5 IoTivity Simple Server and Simple Client
Embedded Software Lab. @ SKKU
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Sungkyunkwan University
Tizen/Artik IoT Practice Part 5IoTivity Simple Server and Simple Client
Embedded Software Lab. @ SKKU
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• In IoTivity, an entity(e.g. Sensor, Actuator) is being handled as a resource(OCF Resource Model).– Each resource contains resource and device types, CRUDN
Operations, URI information– Users can access the Resource via URI and RESTful interface
IoTivity Resource
Embedded Software Lab. @ SKKU
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• Simple IoTivity Server & Client– Make a simple server (Service Provider [e.g. sensors, actuators]) and simple
client (e.g. Android Application) using IoTivity base API(CRUDN).• OCF Server
– In IoTivity network topology, OCF Server handles the CRUDN requests– E.g Temperature Sensors, Lights, Humidity Sensors, Air conditional etc..
• OCF Client– In IoTivity network topology, OCF Client typically finds resources and sends
CRUDN requests – Android, Linux, Tizen, Windows, etc..
IoTivity Simple Server & Client
Embedded Software Lab. @ SKKU
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4RESTful Resource Model
CRUDN
RESTful API
• RESTful API– Http request interface such as GET, PUT, POST, DELETE
• Using RESTful API, users can control the OCF server device in remote
Embedded Software Lab. @ SKKU
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• Using IoTivity base API set, make a simple server (Temperature, Humidity sensors) and Android simple client App
Simple Client & Server Scenario
Temperature Sensor
URi : /a/temperatureType : core.temperatureAPI : RUND
…
CRUDN
Source Repository : https://github.com/gudbooy/IoTivity_Sample_Things.git
Embedded Software Lab. @ SKKU
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• Resource class contains basic operation of IoTivity & CRUDN virtual functions (interface set)
Resource Class
IoTivity/resource/examples/IoTivity_Sample_Server/resource.h File
User-defined Virtual Interface
Common Interface for Entity Handler
<User Define Virtual Function>put : Set the data sent from the clineget : Get the data requested from the ClientSensorValueRead : Sensor Acquisition Read Thread ChangeResourceRepresentation : Observe Thread Logic
<Common Interface Function>Resource Creation Logic :Resource Creation and Registering the URI resourceEntityHandler Logic : Request Handling Parsing Logic
Embedded Software Lab. @ SKKU
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• Common IoTivity Resource API – Resource Creation, Resource Handler (CRUDN Request Parser)
Resource Class Implementation
IoTivity/resource/examples/IoTivity_Sample_Server/resourceImpl.cpp File
Resource Creation Function
Initialization Uri & Resource Type
Registering CRUDN APIParsing Handler Callback
Resource RegisteringRequest Parsing Logic
CRUDN API Handler Unit
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• Entity handler refers to the CRUDN request parsing callback function– GET : get the sensor data, then send data with response to the clients– PUT : receive the status value (e.g. Turn On, Off) from the client, and set the status – Observe : Periodically, observer thread publishing the sensor data to registered clients
Entity Handler - CRUDN Request Handler
GET
Put
Delete
Observe
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• E.g., Light, Humidity, Temp
Server (Thing Device) Interface
<Temperature Things>
Things Meta-Data
URI, Resource Type
< Get Logic >
IoTivity/resource/examples/IoTivity_Sample_Server/simple_server_temp.h / .cpp File
Embedded Software Lab. @ SKKU
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10Server (Thing Device) Interface (2/2)
<Put Logic> <Observation Logic>
Get the data from the Representation
Notify the current message to observers
<Sensor Logic>Sensor Thread Creation
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• IoTivityWrapper.java
Simple Client (Android)
Listener Callback
Operation
Embedded Software Lab. @ SKKU
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12findResource() - Resource Find LogicPlatform Configuration
Find Resource API
<Find Resource Listener Callback>
Found resource info
Embedded Software Lab. @ SKKU
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13GET & PUT Function
<GET Function>
<GET Listener Callback>
<PUT Function>
<Observe Function>
Embedded Software Lab. @ SKKU
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14Client Resource Description
To get the value from Representation for GET, OBSERVE
To set the value to Representation for PUT
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15IoTivity Communication Demo
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/a/temp - PUT Status ON
/a/humidity - PUT Status ON2
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Temperature Humidity
/a/temp - Get /a/humidity - Get
