{
  "event": "addDevice",
  "payload": {
    "id": "of:0000000000000001",
    "type": "switch",
    "online": true,
    "master": "192.168.56.101",
    "labels": [
      "",
      "sw-A",
      "of:0000000000000001"
    ],
    "metaUi": {
      "x": 0,
      "y": 300
    }
  }
}