docs: def enable(
          self,
          cmd="enable",
          pattern="password",
          re_flags=re.IGNORECASE,
          default_username="manager",
      ):
          """Enter enable mode"""
          if self.check_enable_mode():
              return ""
          output = self.send_command_timing(cmd)
          if (
              "username" in output.lower()
              or "login name" in output.lower()
              or "user name" in output.lower()
          ):
              output += self.send_command_timing(default_username)
          if "password" in output.lower():
              output += self.send_command_timing(self.secret)
          log.debug("{}".format(output))
          self.clear_buffer()
          return output