Node-SGS 0.9 (Semantic Gateway as Service for IoT)

Installing necessary packages

Necessary node.js packages are included in the node_modules folders. Some of these modules are modified to accommodate semantic annotation. We recommend the use of included files instead of latest version of those packages from node repository. You also need CoAP client package. Install using,

$sudo npm install coap-cli -g

Similarly Installing MQTT client, mosquitto, using brew on Mac OS x,

$ brew install mosquitto

Test message publishing from one protocol to another

Run the sgs.js file using node.js. Check out the message translation and semantic annotation using following commands on terminal.

CoAP -> CoAP, MQTT

COAP PUT

echo -n '{"Platform":"ArduinoBase1","Observation":"LightObservation","Sensor":"BMP1750","ObservationValue":"1200","ObservationUnit":"Lux"}' | coap put coap://localhost/r/light-COAP

And receive using,

CoAP GET

coap -o coap://localhost/r/light-COAP

MQTT subscribe

mosquitto_sub -t "light-COAP" -v

HTTP -> CoAP, MQTT

HTTP PUT

curl -X PUT -d '{"Platform":"ArduinoBase1","Observation":"HumidityObservation","Sensor":"HIH4030","ObservationValue":"50","ObservationUnit":"%"}'  http://localhost:3000/resources/humidity-HTTP

And receive using,

CoAP GET

coap -o coap://localhost/r/humidity-HTTP

MQTT subscribe

mosquitto_sub -t "humidity-HTTP" -v

MQTT -> CoAP,MQTT

MQTT publish

mosquitto_pub -t temperature-MQTT -m '{"Platform":"ArduinoBase1","Observation":"TemperatureObservation","Sensor":"TMP102","ObservationValue":"22","ObservationUnit":"Celsius"}' -r

And receive using,

CoAP GET

coap -o coap://localhost/r/temperature-MQTT

MQTT subsribe

mosquitto_sub -t "temperature-MQTT" -v

Sample reading from a Sensor

The sample json file sent from the sensor node is,

{
    "Platform":"ArduinoBase1",
    "Observation":"TemperatureObservation",
    "Sensor":"TMP102",
    "ObservationValue":"22",
    "ObservationUnit":"Celsius"
}

ToDo

• Add semantic annotation before sending the message to subscribers/Get requests. Use Semantic Sensot Network (SSN) ontology to annotate

Semantic Gateway as Service for Internet of Things (IoT) architecture

Semantic web based Internet of Things Architecture

Semantic Gateway as Service architecture

Semantic annotation using SSN and Domain ontologies

LICENSE

• Need to provide proper references. Work pending. Will update soon.
• Special Thanks to Matteo Collina and Eclipse Ponte project.
• This program and the accompanying materials
• are made available under the terms of the Eclipse Public License v1.0
• and Eclipse Distribution License v1.0 which accompany this distribution.