The platform uses the QuantumLeap component linked to a TimescaleDB database to provide persistence of each of the modifications in the entities represented in Orion-LD. Each entity modification is reported through the subscription mechanism provided by Orion-LD.
A subscription has been created on the Air Quality data reported by the simulator with the following format:
[
{
"id": "62909436c874d891a23a0a14",
"description": "Subscription for simulated air-quality data",
"status": "active",
"subject": {
"entities": [
{
"idPattern": ".*",
"type": "AirQualityObserved"
}
],
"condition": {
"attrs": []
}
},
"notification": {
"attrs": [
"co",
"so2",
"no2",
"o3",
"pm1",
"pm25",
"pm10"
],
"attrsFormat": "normalized",
"httpCustom": {
"url": "http://quantumleap-quantumleap:8668/v2/notify",
"headers": {
"fiware-service": "AirQuality",
"fiware-servicepath": "/data"
}
}
}
}
]
Thus, every time a new entity is reported, a notification of this value is automatically sent to QuantumLeap. QuantumLeap processes the reported entity and stores it in TimescaleDB.
For more information on the subscription process implemented by Orion-LD, please refer to the following links: