{
  "event": "addDevice",
  "payload": {
    "id": "of:0000ffffffffff03",
    "type": "roadm",
    "online": true,
    "master": "local",
    "labels": [
      "0000ffffffffff03",
      "FF:FF:FF:FF:FF:03",
      "opt-3"
    ],
    "metaUi": {
      "x": 282,
      "y": 603
    }
  }
}