FIWARE Orion Notification

Question

We had Fiware Orion running on local instance - we had issue with notification received.

We need a way to append an identifier with callback url like http://localhost:1028/orion_callback.php?car_id=car_1 or get some data along with call back as Post/Get data.

How do we identify notification recieved for this attribute change ?

Answer 1

You can identify the subscription to which a notification belongs (thus, related with an entity/attribute change) by the subscriptionId field in the notification payload body.

Answer 2

If the question is about adding query parameters to notification URL (i.e. car_id=car1 in your example) you can use custom notifications in NGSIv2.

Based in the example in the question and assuming that car1 refers to entity id you could use something like this:

"httpCustom": {
  "url": " http://localhost:1028/orion_callback.php",
  "qs": {
    "car_id": "${id}"
  }
}

Have a look to "Custom Notifications" section in the NGSIv2 specification for details.