{
  "description": "Adjust brightness by a signed number of percentage points. The endpoint must advertise this message separately from set-brightness.",
  "type": "object",
  "properties": {
    "brightnessDelta": {
      "type": "integer",
      "minimum": -100,
      "maximum": 100
    }
  },
  "required": [
    "brightnessDelta"
  ],
  "additionalProperties": false
}