/***********************
 * Message Definitions *
 ***********************/

#include <stdint.h>

#define MSG_HEADER 0x1234
#define MSG_MAXID  2

#pragma pack(1)

typedef enum {
	MSG_ID_SYNC,       // Time synchronization
	MSG_ID_EVENT,      // Event occurred
} msgid_t;

typedef struct {
	uint32_t seconds;  // Seconds since 1970 (without leap seconds)
	uint32_t nanosec;  // Nanoseconds since 'seconds'
} ntime_t;

typedef struct {
	uint16_t header;   // Message Header
	uint16_t msgid;    // Message ID
	uint16_t length;   // Body length
	uint16_t cksum;    // Body checksum
} header_t;

typedef struct {
	uint32_t seq;      // Current sequence counter
	ntime_t  time;     // Time of previous message
} sync_msg_t;

typedef struct {
	uint16_t device;   // Device ID
	uint16_t event;    // Event ID
	ntime_t  time;     // Timestamp
} event_msg_t;

#pragma pack()