<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def stop(self):
 """Stop the logging for this entry"""

        if (self.cf.link is not None):
            if (self.id is None):
                logger.warning('Stopping block, but no block registered')
            else:
                logger.debug('Sending stop logging for block id=%d', self.id)
                pk = CRTPPacket()
                pk.set_header(5, CHAN_SETTINGS)
                pk.data = (CMD_STOP_LOGGING, self.id)
                self.cf.send_packet(
                    pk, expected_reply=(CMD_STOP_LOGGING, self.id))