{
  "event": "addDevice",
  "payload": {
    "id": "of:0000000000000003",
    "type": "switch",
    "online": true,
    "labels": [
      "of:0000000000000003",
      "3",
      "",
      null
    ],
    "props": {
      "latitude": 123.5,
      "longitude": 67.8,
      "anotherProp": "foobar"
    },
    "metaUi": {
      "xpc": 57.3,
      "ypc": 24.86,
      "and": "other properties the UI wishes to remember..."
    }
  }
}