{
  "name": "Random Number Generator",
  "status": "rc",
  "shortId": "rng",
  "camelName": "rng",
  "shortName": "rng",
  "extends": [
    "_base"
  ],
  "notes": {
    "short": "Generates random numbers using entropy sourced from physical processes.\n\nThis typically uses a cryptographical pseudo-random number generator (for example [Fortuna](<https://en.wikipedia.org/wiki/Fortuna_(PRNG)>)),\nwhich is periodically re-seeded with entropy coming from some hardware source."
  },
  "classIdentifier": 394916002,
  "enums": {
    "Variant": {
      "name": "Variant",
      "storage": 1,
      "members": {
        "Quantum": 1,
        "ADCNoise": 2,
        "WebCrypto": 3
      }
    }
  },
  "constants": {},
  "packets": [
    {
      "kind": "report",
      "name": "command_not_implemented",
      "identifier": 3,
      "description": "This report may be emitted by a server in response to a command (action or register operation)\nthat it does not understand.\nThe `service_command` and `packet_crc` fields are copied from the command packet that was unhandled.\nNote that it's possible to get an ACK, followed by such an error report.",
      "fields": [
        {
          "name": "service_command",
          "type": "u16",
          "storage": 2,
          "isSimpleType": true
        },
        {
          "name": "packet_crc",
          "type": "u16",
          "storage": 2,
          "isSimpleType": true
        }
      ],
      "identifierName": "command_not_implemented",
      "packFormat": "u16 u16",
      "derived": "_base"
    },
    {
      "kind": "const",
      "name": "instance_name",
      "identifier": 265,
      "description": "A friendly name that describes the role of this service instance in the device.\nIt often corresponds to what's printed on the device:\nfor example, `A` for button A, or `S0` for servo channel 0.\nWords like `left` should be avoided because of localization issues (unless they are printed on the device).",
      "fields": [
        {
          "name": "_",
          "type": "string",
          "storage": 0
        }
      ],
      "optional": true,
      "identifierName": "instance_name",
      "packFormat": "s",
      "derived": "_base"
    },
    {
      "kind": "ro",
      "name": "status_code",
      "identifier": 259,
      "description": "Reports the current state or error status of the device. ``code`` is a standardized value from \nthe Jacdac status/error codes. ``vendor_code`` is any vendor specific error code describing the device\nstate. This report is typically not queried, when a device has an error, it will typically\nadd this report in frame along with the announce packet. If a service implements this register,\nit should also support the ``status_code_changed`` event defined below.",
      "fields": [
        {
          "name": "code",
          "type": "u16",
          "storage": 2,
          "isSimpleType": true
        },
        {
          "name": "vendor_code",
          "type": "u16",
          "storage": 2,
          "isSimpleType": true
        }
      ],
      "optional": true,
      "identifierName": "status_code",
      "packFormat": "u16 u16",
      "derived": "_base"
    },
    {
      "kind": "rw",
      "name": "client_variant",
      "identifier": 9,
      "description": "An optional register in the format of a URL query string where the client can provide hints how\nthe device twin should be rendered. If the register is not implemented, the client library can simulate the register client side.",
      "fields": [
        {
          "name": "_",
          "type": "string",
          "storage": 0
        }
      ],
      "optional": true,
      "identifierName": "client_variant",
      "packFormat": "s",
      "derived": "_base"
    },
    {
      "kind": "event",
      "name": "status_code_changed",
      "identifier": 4,
      "description": "Notifies that the status code of the service changed.",
      "fields": [
        {
          "name": "code",
          "type": "u16",
          "storage": 2,
          "isSimpleType": true
        },
        {
          "name": "vendor_code",
          "type": "u16",
          "storage": 2,
          "isSimpleType": true
        }
      ],
      "optional": true,
      "identifierName": "status_code_changed",
      "packFormat": "u16 u16",
      "derived": "_base"
    },
    {
      "kind": "ro",
      "name": "random",
      "identifier": 384,
      "description": "A register that returns a 64 bytes random buffer on every request.\nThis never blocks for a long time. If you need additional random bytes, keep querying the register.",
      "fields": [
        {
          "name": "_",
          "type": "bytes",
          "storage": 0,
          "isSimpleType": true
        }
      ],
      "volatile": true,
      "packFormat": "b"
    },
    {
      "kind": "const",
      "name": "variant",
      "identifier": 263,
      "description": "The type of algorithm/technique used to generate the number.\n`Quantum` refers to dedicated hardware device generating random noise due to quantum effects.\n`ADCNoise` is the noise from quick readings of analog-digital converter, which reads temperature of the MCU or some floating pin.\n`WebCrypto` refers is used in simulators, where the source of randomness comes from an advanced operating system.",
      "fields": [
        {
          "name": "_",
          "type": "Variant",
          "storage": 1
        }
      ],
      "optional": true,
      "identifierName": "variant",
      "packFormat": "u8"
    }
  ],
  "tags": []
}