this.authorizedTags = this.getAuthorizedTags();
   }
 
-  get wsConnectionUrl(): URL {
+  private get wsConnectionUrl(): URL {
     return this.getSupervisionUrlOcppConfiguration()
       ? new URL(
           this.getConfigurationKey(this.getSupervisionUrlOcppKey()).value +
         }
       }
     );
-    // FIXME: triggered by saveConfiguration()
-    // if (this.getOcppPersistentConfiguration()) {
-    //   FileUtils.watchJsonFile<ChargingStationConfiguration>(
-    //     this.logPrefix(),
-    //     FileType.ChargingStationConfiguration,
-    //     this.configurationFile,
-    //     this.configuration
-    //   );
-    // }
     // Handle WebSocket message
     this.wsConnection.on(
       'message',
 
     // Read conf
     return Configuration.objectHasOwnProperty(Configuration.getConfig(), 'logStatisticsInterval')
       ? Configuration.getConfig().logStatisticsInterval
-      : 60;
+      : Constants.DEFAULT_LOG_STATISTICS_INTERVAL;
   }
 
   static getUIWebSocketServer(): UIWebSocketServerConfiguration {
 
 
   static readonly DEFAULT_CONNECTION_TIMEOUT = 30;
 
+  static readonly DEFAULT_LOG_STATISTICS_INTERVAL = 60; // Seconds
+
   static readonly DEFAULT_HEARTBEAT_INTERVAL = 60000; // Ms
 
   static readonly SUPPORTED_MEASURANDS = Object.freeze([