public static function update_probe_list()
 {
     // create and check connection
     $link = CheckrouteDatabase::connect();
     // delete all current entries of Atlas probes in database
     echo 'Deleting current database entries...';
     echo '<br/>';
     $stmt = mysqli_prepare($link, "DELETE FROM `AtlasProbe` WHERE 1");
     if ($stmt) {
         mysqli_stmt_execute($stmt);
         mysqli_stmt_close($stmt);
     }
     // close database connection
     mysqli_close($link);
     echo 'Starting update...';
     echo '<br />';
     AtlasProbeHandler::download_probe_list();
 }