private static void logBeacon(TCPDumpRecord currRec, long startTime, FileLogger flogger) {
   flogger.log(
       currRec.getTimeStamp()
           + "\t"
           + (currRec.getTimeStamp() - startTime) / 1000.0
           + "\t"
           + Long.toHexString(currRec.getSourceAddr())
           + "\t"
           + currRec.getNetworkName()
           + "\t"
           + currRec.getRSSI());
 }