Created question in FIWARE Q/A platform on 04-09-2019 at 10:09
Please, ANSWER this question AT https://stackoverflow.com/questions/57784710/orion-subscriptions-that-never-receive-changes

Question:
Orion subscriptions that never receive changes

Description:
I'm having a problem with some entities to make the subscriptions. The subcriptions are well done (orion responds ok. Status 201) but the url subscribed never receive any update.

I have fiware-orion launched with docker over a Centos 7.

This is an example of the entity.

{
"id": "urn:ngsi-ld:ParkingGroup:Cervantes",
"type": "ParkingGroup",
"allowedVehicleType": {
"type": "Property",
"value": "car",
"metadata": {}
},
"availableSpotNumber": {
"type": "Property",
"value": 59,
"metadata": {}
},
"category": {
"type": "Property",
"value": [
"offstreet",
"feeCharged"
],
"metadata": {}
},
"chargeType": {
"type": "Property",
"value": [
"temporatyPrice"
],
"metadata": {}
},
"description": {
"type": "Property",
"value": "Calle CervantesMálaga",
"metadata": {}
},
"location": {
"type": "GeoProperty",
"value":

,
"metadata": {}
},
"name": {
"type": "Text",
"value": "Cervantes",
"metadata": {}
},
"occupancyDetectionType": {
"type": "Property",
"value": "none",
"metadata": {}
},
"permitActiveHours": {
"type": "Property",
"value": "",
"metadata": {}
},
"requiredPermit": {
"type": "Property",
"value": "noPermitNeeded",
"metadata": {}
},
"totalSpotNumber": {
"type": "Property",
"value": "414",
"metadata": {}
}
}

I try different ways of subscriptions that all of them are accepted by orion like this:

{
"description": "Notificar cambios en Aparcamientos",
"subject": {
"entities": [

],
"condition":

},
"notification": {
"attrs" : ["availableSpotNumber"],
"http":

}
}

When I update the data with this through postman in mode PUT:

http://orion/v2/entities/urn:ngsi-ld:ParkingGroup:Cervantes/attrs/availableSpotNumber/value

and Body (text/plain) with value 2

The data is well ubdate when I make in postman in mode GET:
http://orion/v2/entities/urn:ngsi-ld:ParkingGroup:Cervantes/attrs/availableSpotNumber

It returns:

{
"type": "Property",
"value": 2,
"metadata": {}
}

But url of the subscription never receives anything

what is wrong?
How can I solve it? How could I debug Orion to understand why it doesn't update the subscriptors?

The idea is to subscribe later cygnus. I have read that I must add the attrsFormat for it in this way:

"notification": {
"http":

,
"attrs" : ["availableSpotNumber"],
"attrsFormat": "legacy"
}

Thanks in advance