code: def close(self):
          '''Close the connection.'''
          if self.writer:
              _logger.debug('Closing connection.')
              self.writer.close()
  
              self.writer = None
              self.reader = None
  
          if self._close_timer:
              self._close_timer.close()
  
          self._state = ConnectionState.deaf close(self):
          '''Close the connection.'''
          if self.writer:
              _logger.debug('Closing connection.')
              self.writer.close()
  
              self.writer = None
              self.reader = None
  
          if self._close_timer:
              self._close_timer.close()
  
          self._state = ConnectionState.dead
docs: Close the connection.