Sending a specific entity to FIWARE QuantumLeap - json

Question

In my application I have a very specific entity format, where one of the attributes' values is a json array of values.
{
"id": "Proximity3",
"type": "SensorAgent",
"measurementType": {
"type": "string",
"value": "boolean",
"metadata": {}
},
"modifiedTime": {
"type": "string",
"value": "2020-06-08T12:30:11.091506Z",
"metadata": {}
},
"readings": {
"type": "array",
"value": [
{
"type": "SensorReading",
"value": {
"reading": {
"type": "boolean",
"value": false
}
}
}
],
"metadata": {}
},
"sanID": {
"type": "string",
"value": "SAN_3",
"metadata": {}
},
"sensorID": {
"type": "string",
"value": "Proximity3",
"metadata": {}
},
"sensorManufacturer": {
"type": "string",
"value": "Unknown",
"metadata": {}
},
"sensorType": {
"type": "string",
"value": "ON_OFF_SENSOR",
"metadata": {}
}
}
]
As you can see, readings attribute has an array of values stored in it (in this example only one.
Whenever I try to subscribe QuantumLeap to Orion Context Broker, subscription is successful, but there is no data received by QuantumLeap (even querying http://localhost:8668/v2/attrs gives me 'No records were found for such query.'). Tried using attrFormat on subscription, but unsuccessful.
At the same time, this https://quantumleap.readthedocs.io/en/latest/user/ suggests that the QuantumLeap expects a specific entity.
My question is, is there anything possible to do in order to get this entity to QuantumLeap, or I would need to change the entity?

Answer 1

It is clear from the QuantumLeap Data Insertion documentation that QuantumLeap expects the notification it receives to contain attributes passed as Native JSON types (like Number)
"temperature": {
"value": 24.2,
"type": "Number",
"metadata": {}
}
If your context broker holds attributes in a different way, direct notification will always fail, but there is nothing stopping you from proxying the notification and reformatting it in the manner that QuantumLeap prefers.
Create a simple subscription listener to read the current subscription data,
reformat the bits you need and forward to Quantum Leap and return the received HTTP success/failure back to the context broker.
const request = require('request');
function receiver(req, res) {
let data = [];
// Manipulate the data
req.body.data.readings.value.forEach((reading) => {
data.push[reading.value]
});
// Copy the rest of data from the original subscription
// Then Forward to QuantumLeap - replace with real values
const options = {
url: '/subscription/to/quantum/leap',
method: 'POST',
json: data,
headers:
};
// Respond back to context broker with response from QL
request(options, (error, response, body) => {
return error ? res.send(error) : res.status(204).send();
});
}