def parse(self, data):
        """Parse a 12 bytes packet in the Lighting2 format and return a
        dictionary containing the data extracted. An example of a return value
        would be:

        .. code-block:: python

            {
                'id': "0x111F342",
                'packet_length': 10,
                'packet_type': 17,
                'packet_type_name': 'Humidity sensors',
                'sequence_number': 19,
                'packet_subtype': 0,
                'packet_subtype_name': "AC",
                'unit_code': 10,
                'command': 1,
                'command_text': "Off",
                'level': 7,
                'signal_level': 9,
            }

        :param data: bytearray to be parsed
        :type data: bytearray

        :return: Data dictionary containing the parsed values
        :rtype: dict
        """

        self.validate_packet(data)

        results = self.parse_header_part(data)
        sub_type = results['packet_subtype']

        id_ = self.dump_hex(data[4:8])

        unit_code = data[8]
        command = data[9]
        command_text = SUB_TYPE_COMMANDS.get(sub_type, {}).get(command)
        dim_level = DIM_LEVEL_TO_PERCENT.get(data[10], '--??--')

        sensor_specific = {
            'id': id_,
            'unit_code': unit_code,
            'command': command,
            'command_text': command_text,
            'dim_level': dim_level
        }

        results.update(RfxPacketUtils.parse_signal_upper(data[11]))
        results.update(sensor_specific)

        return results