[
  {
    "cmd": "GetMask",
    "code": 0,
    "initial": {
      "Mask": {
        "area": [
          {
            "block": {
              "height": 0,
              "width": 0,
              "x": 0,
              "y": 0
            },
            "screen": {
              "height": 0,
              "width": 0
            }
          }
        ],
        "channel": 0,
        "enable": 0
      }
    },
    "range": {
      "Mask": {
        "channel": 0,
        "enable": "boolean",
        "maxAreas": 4
      }
    },
    "value": {
      "Mask": {
        "area": null,
        "channel": 0,
        "enable": 0
      }
    }
  }
]