json_schema: {
  
          "$schema": "http://json-schema.org/draft-04/schema#",
          "type": "object",
          "properties": {
              "sensorId": {
                  "type": "string"
              },
              "temperature": {
                  "type": "object",
                  "properties": {
                      "old": {
                          "type": "number"
                      },
                      "new": {
                          "type": "number"
                      }
                  }
              }
          }
      
  }
  