{
  "event": "addDevice",
  "payload": {
    "id": "of:0000ffffffffff02",
    "type": "roadm",
    "online": true,
    "labels": [
      "0000ffffffffff02",
      "FF:FF:FF:FF:FF:02",
      "?"
    ],
    "metaUi": {
      "x": 211,
      "y": 307
    }
  }
}