{
  "event": "addDevice",
  "payload": {
    "id": "of:0000000000000003",
    "type": "roadm",
    "online": true,
    "master": "ONOS",
    "labels": [
      "",
      "roadm",
      "of:0000000000000003"
    ],
    "metaUi": {
      "x": 500,
      "y": 200
    }
  }
}