def _status_message_0x01_received(self, msg):
        """Handle status received messages.

        The following status values can be received:
            0x00 = Both Outlets Off
            0x01 = Only Top Outlet On
            0x02 = Only Bottom Outlet On
            0x03 = Both Outlets On
        """
        if msg.cmd2 == 0x00 or msg.cmd2 == 0x02:
            self._update_subscribers(0x00)
        elif msg.cmd2 == 0x01 or msg.cmd2 == 0x03:
            self._update_subscribers(0xff)
        else:
            raise ValueError
Handle status received messages.

        The following status values can be received:
            0x00 = Both Outlets Off
            0x01 = Only Top Outlet On
            0x02 = Only Bottom Outlet On
            0x03 = Both Outlets On