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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>

#define AT_ATTN "+++"
#define AT_RESET "ATZ\r"

struct termios tty_old_settings, tty_settings;

main()
{
	int tty;
	unsigned char inchar;

	tty = open("/dev/cuaa2", O_RDWR);

	tcgetattr(tty, &tty_old_settings);
	tcgetattr(tty, &tty_settings);

	tty_settings.c_iflag &= ~(ICRNL | IXOFF | IXON);
//	tty_settings.c_iflag |= IGNCR;
	tty_settings.c_lflag &= ~(ECHO | ICANON | ISIG);
	tty_settings.c_cflag |= CRTSCTS;         /* Hardware flow control! */
	tty_settings.c_oflag &= ~OPOST;

	tty_settings.c_cc[VMIN] = 1;
	tty_settings.c_cc[VTIME] = 0;
				   
	cfsetispeed(&tty_settings, B115200);
	cfsetospeed(&tty_settings, B115200);
									    
	tcsetattr(tty, TCSAFLUSH, &tty_settings);    
	
	write(tty, AT_ATTN, 3);
	sleep(1);
	write(tty, AT_RESET, 4);
	sleep(1);
	write(tty, AT_RESET, 4);

	sleep(1);

	while (read(tty, &inchar, 1) >0) {
		putchar(inchar);
	}


	tcsetattr(tty, TCSAFLUSH, &tty_old_settings);
	close(tty);
}
.

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