TwePacketPAL

class TwePacketPal : public TwePacket, public DataPal { ... };

struct DataPal {
	uint8_t u8lqi; // LQI value

	uint32_t u32addr_rpt; // address of the relay

	uint32_t u32addr_src; // source address
	uint8_t u8addr_src; // source logical address

	uint16_t u16seq; // sequence number

	E_PAL_PCB u8palpcb; // PAL board type
	uint8_t u8palpcb_rev; // Revision of PAL board
	uint8_t u8sensors; // Number of sensor data in the data (MSB=1 is an error)
	uint8_t u8snsdatalen; // sensor data length (in bytes)

	union {
		const uint8_t *au8snsdata; // reference to sensor data part
		uint8_t _pobj[MWX_PARSER_PKT_APPPAL_FIXED_BUF]; // each sensor object
	};
};

	struct PalBase {
		uint32_t u32StoredMask; // Data acquisition flags used internally
	};

	struct PalEvent {
		uint8_t b_stored; // true if stored
		uint8_t u8event_source; // spare
		uint8_t u8event_id; // event ID
		uint32_t u32event_param;// event parameter
	};

void print_pal(pktparser& pkt) {
	auto&& pal = pkt.use<TwePacketPal>();
	if (pal.is_PalEvent()) {
		PalEvent obj = pal.get_PalEvent();
	} else
	switch(pal.u8palpcb) {
	case E_PAL_PCB::MAG:
	  {
		  // generate pal board specific data structure.
		  PalMag obj = pal.get_PalMag();
	  } break;
  case E_PAL_PCB::AMB:
	  {
		  // generate pal board specific data structure.
		  PalAmb obj = pal.get_PalAmb();
	  } break;
	  ...
	default: ;
	}
}

PalMag get_PalMag()

// MAG
struct PalMag : public PalBase {
    uint16_t u16Volt; // module voltage [mV]
    uint8_t u8MagStat; // state of magnetic switch [0:no magnet,1,2].
    uint8_t bRegularTransmit; // MSB flag of u8MagStat
};

PalAmb get_PalAmb()

// AMB
struct PalAmb : public PalBase {
    uint16_t u16Volt; // module voltage [mV]
    int16_t i16Temp; // temperature (100x value)
    uint16_t u16Humd; // humidity (100x value)
    uint32_t u32Lumi; // illuminance (equivalent to Lux)
};

PalMot get_PalMot()

// MOT
struct PalMot : public PalBase {
    uint16_t u16Volt; // module voltage [mV]
    uint8_t u8samples; // number of samples
    uint8_t u8sample_rate_code; // sample rate (0: 25Hz, 4:100Hz)
    int16_t i16X[16]; // X axis
    int16_t i16Y[16]; // Y axis
    int16_t i16Z[16]; // Z axis
};

PalEvent get_PalEvent()

// PAL event
struct PalEvent {
    uint8_t b_stored; // if true, event information is available
    uint8_t u8event_source; // event source
    uint8_t u8event_id; // event ID
    uint32_t u32event_param; // 24bit, event parameter
};