code: public void set_logging_level (DevVarLongStringArray dvlsa) throws DevFailed {
      //- Check input
      if (dvlsa.svalue.length != dvlsa.svalue.length) {
        String desc = "Imcompatible command argument type, long and string arrays must have the same length";
        Except.throw_exception("API_IncompatibleCmdArgumentType", desc, "Logging::set_logging_level");
      }
      //- For each entry in dvlsa.svalue
      for (int i = 0; i < dvlsa.svalue.length; i++) {
        //- Check/get logging level (may throw DevFailed)
        Level level = tango_to_log4j_level(dvlsa.lvalue[i]);
        //- Get ith wilcard
        String pattern = dvlsa.svalue[i].toLowerCase();
        //- Get devices which name matches the pattern pattern
        Vector dl = Util.instance().get_device_list(pattern);
        //- For each device in dl
        Iterator it = dl.iterator();
        while (it.hasNext()) {
          Logger logger = ((DeviceImpl)it.next()).get_logger();
          if (logger == null) {
            String desc = "Internal error. Got invalid logger for device " + logger.getName();
            Except.throw_exception("API_InternalError", desc, "Logging::set_logging_level");
          }
          // set logger's level
          logger.setLevel(level);
          Util.out4.println("Logging level set to " + level.toString() + " for device " + logger.getName());
        } //  while it.hasNext
      } // for i
  	}
docs: Set logging level for the specified devices
  
  @param dvlsa A Tango.DevVarLongStringArray containing device-names and logging levels