/// for debugging ///
  public static void printRetrieveStatistics() {

    List<StatisticalReports> allReports = retrieveStatistics("admin", "1234");
    if (allReports == null) return;

    for (int i = 0; i < allReports.size(); i++) {
      System.out.println("+++++++++++ CLIENT ++++++++++++");
      StatisticalReports report = allReports.get(i);

      List<StatisticsEntry> entriesList = report.getStatisticalReportEntries();
      for (int j = 0; j < entriesList.size(); j++) {
        StatisticsEntry entry = entriesList.get(j);
        System.out.println("\n------------------------------");
        System.out.println("nodeID: " + entry.getNodeID());
        System.out.println("interfaceName: " + entry.getInterfaceName());
        System.out.println("ip: " + entry.getInterfaceIP());
        System.out.println("pattern: " + entry.getMaliciousPattern());
        System.out.println("freq: " + entry.getFrequency());
      }
    }
  }