#include <stdio.h>#include <stdlib.h>#include "serialsource.h"static char *msgs[] = {  "unknown_packet_type",  "ack_timeout"	,  "sync"	,  "too_long"	,  "too_short"	,  "bad_sync"	,  "bad_crc"	,  "closed"	,  "no_memory"	,  "unix_error"};void stderr_msg(serial_source_msg problem){  fprintf(stderr, "Note: %s\n", msgs[problem]);}int main(int argc, char **argv){  serial_source src;  if (argc != 3)    {      fprintf(stderr, "Usage: %s <device> <rate> - dump packets from a serial port\n", argv[0]);      exit(2);    }  src = open_serial_source(argv[1], atoi(argv[2]), 0, stderr_msg);  if (!src)    {      fprintf(stderr, "Couldn't open serial port at %s:%s\n",	      argv[1], argv[2]);      exit(1);    }  for (;;)    {      int len, i;      const unsigned char *packet = read_serial_packet(src, &len);      if (!packet)	exit(0);      for (i = 0; i < len; i++)	printf("%02x ", packet[i]);      putchar('\n');      free((void *)packet);    }}