{
  "event": "addDevice",
  "payload": {
    "id": "of:0000000000000007",
    "type": "balancer",
    "online": true,
    "master": "ONOS",
    "labels": [
      "",
      "balancer",
      "of:0000000000000007"
    ],
    "metaUi": {
      "x": 600,
      "y": 300
    }
  }
}