s.c

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#include <stdio.h>

typedef struct {
  unsigned int version:2;   /* protocol version */
  unsigned int type:2;      /* type flag */
  unsigned int token_length:4;  /* length of Token */
  unsigned int code:8;          /* request method (value 1--10) or response code (value 40-255) */
  unsigned short id;        /* message id */
  unsigned char token[];    /* the actual token, if any */
} coap_hdr_t;

int main() {
  printf("%zu\n", sizeof(coap_hdr_t));

  return 0;
}