def disconnect(self):
        """
        diconnect from the connected device

        :return: bool
        """
        cmd_response = self.__send_command(const.CMD_EXIT)
        if cmd_response.get('status'):
            self.is_connect = False
            if self.__sock:
                self.__sock.close()
            return True
        else:
            raise ZKErrorResponse("can't disconnect")
diconnect from the connected device

        :return: bool