{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "properties": {
    "timestamp": {
      "type": "integer",
      "minimum": 0,
      "maximum": 9999999999999999999,
      "description": "19-bit Unix timestamp in nanoseconds"
    },
    "variables": {
      "type": "object",
      "patternProperties": {
        "^[a-zA-Z0-9_]+$": {
          "oneOf": [
            { "type": "string" },
            { "type": "boolean" },
            { "type": "integer" },
            { "type": "number" },
            { "type": "integer", "minimum": 0, "maximum": 255 }
          ]
        }
      },
      "additionalProperties": false
    }
  },
  "required": ["timestamp", "variables"]
}