anchor.diff:              "notification": {
                   "callback": "http://localhost:1234",
                   "attributes": ["temperature", "humidity"],
  -                "throttling": 5,
  +                "throttling": 5
               },            
               "expires": "2016-04-05T14:00:00.00Z"
           }
  
positive.code: + Response 200 (application/json)
  
          {
              "value": 21.7
              "type": null,
              "metadata": {}
          }
  
negative.code:             "id": "efgh",
              "subject": {
                "entities": [
                  {
                    "id": "myBar",
                    "type": "myBarType"
                  }
                ],
                "attributes": [
                  "speed"
  