test.json

[
  {
    "items": [
      {
        "id": 1,
        "status": "",
        "calibrated": 1521135120000,
        "location": {
          "latitude": -117.125,
          "longitude": 31.125
        }
      },
      {
        "id": 2,
        "status": "offline",
        "calibrated": 1521638100000,
        "location": {
          "latitude": -113.325,
          "longitude": 33.325
        }
      },
      {
        "id": 3,
        "status": "error",
        "calibrated": 1522291320000,
        "location": {
          "latitude": -111.625,
          "longitude": 35.625
        }
      }
    ]
  }
]