<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 async def close(self, event):
 """Close the PLM device connection and don't try to reconnect."""

        _LOGGER.info('Closing connection to Insteon Modem')
        self._closing = True
        self._auto_reconnect = False
        await self.protocol.close()
        if self.protocol.transport:
            self.protocol.transport.close()
        await asyncio.sleep(0, loop=self._loop)
        _LOGGER.info('Insteon Modem connection closed')