{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "contract/ingest/common.schema.json",
  "type": "object",
  "required": ["v", "t", "id", "ts", "d", "p"],
  "additionalProperties": false,
  "properties": {
    "v": {
      "type": "integer",
      "const": 1
    },
    "id": {
      "type": "integer",
      "minimum": 1,
      "maximum": 4294967295,
      "description": "Autoincrement message id. Unique per session"
    },
    "t": {
      "type": "string",
      "enum": ["t", "e", "c"],
      "description": "Message type (<t>elemetry, <e>vent, <c>ommand)"
    },
    "ts": {
      "type": "integer",
      "minimum": 1600000000,
      "description": "Unix time in seconds (UTC)"
    },
    "d": {
      "type": "integer",
      "minimum": 1,
      "description": "Device ID. Unique per scope"
    },
    "p": {
      "type": "object",
      "description": "User data. Type-specific."
    }
  },

  "allOf": [
    {
      "if": { 
 	"required": ["t"],
 	"properties": { "t": { "const": "t" } } 
      },
      "then": {
  	"required": ["p"],
        "properties": {
          "p": { "$ref": "telemetry.schema.json" }
        }
      }
    },
    {
      "if": { 
	"required": ["t"],
	"properties": { "t": { "const": "e" } } 
      },
      "then": {
  	"required": ["p"],
        "properties": {
          "p": { "$ref": "event.schema.json" }
        }
      }
    },
    {
      "if": { 
	"required": ["t"],
	"properties": { "t": { "const": "c" } } 
      },
      "then": {
  	"required": ["p"],
        "properties": {
          "p": { "$ref": "command.schema.json" }
        }
      }
    }
  ]
}