Update comments on general architecture.
#ifndef IEC_TYPES_H
#define IEC_TYPES_H
#include <limits.h>
#include <float.h>
#include <stdint.h>
/*********************/
/* IEC Types defs */
/*********************/
typedef uint8_t IEC_BOOL;
typedef int8_t IEC_SINT;
typedef int16_t IEC_INT;
typedef int32_t IEC_DINT;
typedef int64_t IEC_LINT;
typedef uint8_t IEC_USINT;
typedef uint16_t IEC_UINT;
typedef uint32_t IEC_UDINT;
typedef uint64_t IEC_ULINT;
typedef uint8_t IEC_BYTE;
typedef uint16_t IEC_WORD;
typedef uint32_t IEC_DWORD;
typedef uint64_t IEC_LWORD;
typedef float IEC_REAL;
typedef double IEC_LREAL;
typedef struct {
long int tv_sec; /* Seconds. */
long int tv_nsec; /* Nanoseconds. */
}__attribute__((packed)) IEC_TIMESPEC;
typedef IEC_TIMESPEC IEC_TIME;
typedef IEC_TIMESPEC IEC_DATE;
typedef IEC_TIMESPEC IEC_DT;
typedef IEC_TIMESPEC IEC_TOD;
#ifndef STR_MAX_LEN
#define STR_MAX_LEN 126
#endif
#ifndef STR_LEN_TYPE
#define STR_LEN_TYPE int8_t
#endif
typedef STR_LEN_TYPE __strlen_t;
typedef struct {
__strlen_t len;
uint8_t body[STR_MAX_LEN];
} __attribute__((packed)) IEC_STRING;
#endif /*IEC_TYPES_H*/