#define M2_UNDEFINED_TEMP -32768
#define M2_UNDEFINED_HUMID -32768

#define M2_COUNTER

typedef struct
	{
	uint8_t device_type;
	uint8_t serial;
	uint8_t report_type;
	uint8_t arg1;
	int16_t arg2;
	int32_t arg3;
#ifdef M2_COUNTER
	uint16_t counter;
#endif
	uint16_t crc;
	} 
	__attribute__((packed))
	METEO2_DATAGRAM;

//device types
#define M2_METEOSTATION 1

//report types
#define M2_RESET 0
#define M2_TEMP_HUMID 1
#define M2_PRESSURE 2
#define M2_LIGHT 3
#define M2_WIND 4
#define M2_WIND_GUSTS 5
#define M2_RAIN 6
#define M2_WATER_LEVEL 7
#define M2_WATER_ALARM 8
#define M2_VOLTAGE 9
#define M2_PING 10