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"
                          }
                      }
                  }
              }
          
      }
  
  