on-change-sub.json

{
  "id": "urn:ngsi-ld:Subscription:withOnChange",
  "type": "Subscription",
  "entities": [
    {
      "type": "candil:Interface",
      "id": "candil:r1_e1-1"
    }
  ],
  "watchedAttributes": ["candil:operStatus"],
  "notification": {
    "attributes": ["candil:operStatus"],
    "endpoint": {
      "uri": "http://analytics-server:8080",
      "accept": "application/json"
    }
  }
}