json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "type": "array",
      "items": {
          "$schema": "http://json-schema.org/draft-04/schema#",
          "type": "object",
          "properties": {
              "time": {
                  "type": "string",
                  "format": "date-time"
              },
              "relayId": {
                  "type": "string"
              },
              "data": {
                  "type": "object",
                  "patternProperties": {
                      "^[0-9a-zA-Z_-]{1,255}$": {
                          "type": [
                              "number",
                              "string",
                              "boolean"
                          ]
                      }
                  },
                  "additionalProperties": false
              }
          },
          "required": [
              "data"
          ],
          "additionalProperties": false
      }
  }