docs: public ReturnCode pause(String targetArg) {
          StringBuilder commandBuilder = new StringBuilder(PAUSE_COMMAND);
  
          char sep = DELIM;
          if (targetArg != null) {
              commandBuilder.append(sep).append(targetArg);
          }
  
          return write(commandBuilder.toString(),
                       ReturnCode.SERVER_INACTIVE_STATUS,
                       ReturnCode.ERROR_SERVER_PAUSE);
      }