{
  "$udmi_version": "1.5.2",
  "title": "System State",
  "description": "[System State Documentation](../docs/messages/system.md#state)",
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "additionalProperties": false,
  "properties": {
    "timestamp": {
      "description": "Not included in messages published by devices. Part of message subblocks within cloud pipeline. RFC 3339 Timestamp the payload was generated",
      "type": "string",
      "format": "date-time",
      "examples": ["2019-01-17T14:02:29.364Z"]
    },
    "version": {
      "description": "Version of the UDMI schema",
      "type": "string"
    },
    "last_config": {
      "description": "Time from the `timestamp` field of the last successfully parsed `config` message (not the timestamp the message was received/processed). Part of the [config state sequence](../docs/specs/sequences/config.md)",
      "type": "string",
      "format": "date-time",
      "examples": ["2019-01-17T14:02:29.364Z"]
    },
    "operation": {
      "$ref": "file:state_system_operation.json"
    },
    "serial_no": {
      "description": "The serial number of the physical device",
      "type": "string",
      "examples": ["A1B2C3D4", "00001"]
    },
    "hardware": {
      "$ref": "file:state_system_hardware.json"
    },
    "software": {
      "additionalProperties": false,
      "description": "A collection of items which can be used to describe version of software running on a device",
      "examples": ["firmware", "os", "driver"],
      "type": "object",
      "existingJavaType": "java.util.Map<String, String>",
      "patternProperties": {
        "^[a-z_]+$": {
          "type": "string"
        }
      }
    },
    "params": {
      "additionalProperties": false,
      "type": "object",
      "existingJavaType": "java.util.Map<String, String>",
      "patternProperties": {
        "^[a-z_]+$": {
          "type": "string"
        }
      }
    },
    "status": {
      "$ref": "file:entry.json"
    },
    "upgraded_from": {
      "description": "Original version of schema pre-upgrade",
      "type": "string"
    }
  },
  "required": [
    "serial_no",
    "last_config",
    "hardware",
    "software",
    "operation"
  ]
}