{
  "colSpec": [
    ["Num", "text", "Car number"],
    ["State", "text"],
    ["Class", "class"],
    ["PIC", "numeric", "Position in class"],
    ["Driver", "text"],
    ["Gap", "delta", "Gap to leader"],
    ["Int", "delta", "Interval to car in front"],
    ["S1", "time", "Sector 1 time"],
    ["S2", "time", "Sector 2 time"],
    ["S3", "time", "Sector 3 time"],
    ["Last", "time", "Last lap time"],
    ["Best", "time", "Best lap time"]
  ],
  "description": "4H of Sepang - Free practice 1",
  "livetimingVersion": {
    "core": "2020.1.1",
    "plugin": "2020.1.4"
  },
  "name": "Asian Le Mans Series",
  "pollInterval": 1,
  "serviceClass": "aslms",
  "source": ["© TimeService", "http://www.timeservice.nl/"],
  "trackDataSpec": [
    "Air temperature",
    "Track temperature"
  ],
  "uuid": "99e54c1c603b4e318c4c8afac88f94e7"
}

A service manifest contains metadata relating to the content of state messages from a service process. It defines the meanings of each column of data for each car, and contains information about the data source. State messages cannot be correctly understood without a service manifest.

The manifest for a running service instance may change over time; for example, between two track sessions happening back-to-back.

Description

• colSpec: Required. Defines each of the columns of data available for display, as used in the cars array in state messages. Each item consists of a two- or three-element array:
  • Column heading
  • Type
  • Description (optional)

  Any values may be used, but a number are predefined by livetiming-core. See Constants and enumerations.

• description: Required. Description of the session or race.
• livetimingVersion: Version information relating to the service instance.
  • core: Version of livetiming-core in use.
  • plugin: Version of the specific timing service plugin.
• name: Required. Name of the racing series or upstream provider.
• pollInterval: Required. Interval at which new data is obtained from the upstream data source. Used to indicate accuracy of calculated data.
• serviceClass: Name of service plugin.
• source: Attribution of source data. Consists of a two-element array:
  • Name
  • URL (or null)
• trackDataSpec: Required. Defines the data available in the state session.trackData element.
• uuid: Unique identifier generated for this service instance.

The service manifest may contain additional items as required by implementations.