{
  "event": "updateLink",
  "payload": {
    "id": "of:0000000000000002/4-of:0000000000000001/1",
    "type": "direct",
    "linkWidth": 2,
    "src": "of:0000000000000002",
    "srcPort": "4",
    "dst": "of:0000000000000001",
    "dstPort": "1"
  }
}