code: def send(self, cmd="", timeout=300, wait_for_string=None, password=False):
          
          return self._chain.send(cmd, timeout, wait_for_string, password)
docs: Send the command to the device and return the output.
  
          Args:
              cmd (str): Command string for execution. Defaults to empty string.
              timeout (int): Timeout in seconds. Defaults to 300 sec (5 min)
              wait_for_string (str): This is optional string that driver
              waits for after command execution. If none the detected
              prompt will be used.
              password (bool): If true cmd representing password is not logged
                  and condoor waits for noecho.
  
          Returns:
              A string containing the command output.
  
          Raises:
              ConnectionError: General connection error during command execution
              CommandSyntaxError: Command syntax error or unknown command.
              CommandTimeoutError: Timeout during command execution