{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "http://schema.ruter.no/tsp.json",
  "type": "object",
  "title": "Traffic Preemption MQTT Message",
  "description": "Notification that vehicle should transmit a traffic preemption message",
  "required": [
    "eventTimestamp",
    "message"
  ],
  "additionalProperties": false,
  "properties": {
    "eventTimestamp": {
      "$id": "#/properties/eventTimestamp",
      "type": "string",
      "description": "Event timestamp must be ISO 8601 UTC",
      "format": "date-time"
    },
    "message": {
      "$id": "#/properties/message",
      "type": "string",
      "description": "Encoded message for transmission on VHF (VDV telegram)"
    }
  }
}