{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "type": "object",
  "properties": {
    "key": {
      "type": "string"
    },
    "payload": {},
    "meta": {},
    "flowVersion": {
      "type": "string",
      "minLength": 1,
      "maxLength": 255
    },
    "deviceId": {
      "type": "string",
      "pattern": "^[A-Fa-f\\d]{24}$"
    }
  },
  "required": [
    "key"
  ],
  "additionalProperties": false
}