{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/mercedes-me/main/json-schema/mercedes-me-dtc-readout-schema.json",
  "title": "Mercedes-Benz DTC Readout",
  "description": "Schema for a Mercedes-Benz Diagnostic Trouble Code readout returned by the Remote Diagnostic Support API.",
  "type": "object",
  "required": ["vehicleId", "readoutId", "status"],
  "properties": {
    "vehicleId": {
      "type": "string",
      "description": "VIN/FIN of the Mercedes-Benz vehicle. 17-character VIN.",
      "minLength": 17,
      "maxLength": 17
    },
    "readoutId": {
      "type": "string",
      "description": "Server-assigned identifier for this readout request."
    },
    "status": {
      "type": "string",
      "description": "Current readout status.",
      "enum": ["PENDING", "IN_PROGRESS", "COMPLETED", "FAILED", "TIMED_OUT"]
    },
    "createdAt": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp when the readout was requested."
    },
    "completedAt": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp when the readout finished (if applicable)."
    },
    "ecus": {
      "type": "array",
      "description": "ECUs covered by the readout.",
      "items": {
        "type": "object",
        "required": ["ecuId"],
        "properties": {
          "ecuId": {"type": "string", "description": "Electronic Control Unit identifier."},
          "ecuName": {"type": "string"},
          "dtcs": {
            "type": "array",
            "description": "Diagnostic Trouble Codes reported by this ECU.",
            "items": {
              "type": "object",
              "required": ["dtcId"],
              "properties": {
                "dtcId": {"type": "string", "description": "DTC identifier (often UDS-format hex)."},
                "description": {"type": "string"},
                "severity": {"type": "string", "enum": ["INFO", "LOW", "MEDIUM", "HIGH", "CRITICAL"]},
                "active": {"type": "boolean"},
                "occurrenceCount": {"type": "integer", "minimum": 0}
              }
            }
          }
        }
      }
    },
    "errors": {
      "type": "array",
      "description": "Errors encountered during readout, if any.",
      "items": {
        "type": "object",
        "properties": {
          "code": {"type": "string"},
          "message": {"type": "string"}
        }
      }
    }
  }
}