{
  "event": "addDevice",
  "payload": {
    "id": "of:0000ffffffffff08",
    "type": "roadm",
    "online": true,
    "labels": [
      "",
      "opt-B",
      "0000ffffffffff08"
    ],
    "metaUi": {
      "x": 539,
      "y": 186
    }
  }
}