Executer des commandes Hayes (AT) en language C

/* file: hello.c */
#include <stdio.h>

int main()
{
    puts("Hello, world");
    return 0;
}

$ gcc -Wall -o hello hello.c

#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <termios.h>
#include <unistd.h>


int main()
{
int fd1;
int fd2;
char *buff,*buffer,*bufptr;
int wr,rd,nbytes,tries;

//beg0 added: Allocation memoire necessaire
buff=(char*)calloc(sizeof(char), 10+1);

//Next step, we connect to device through associated file and check the connection:

fd1 = open(&#8220;/dev/ttyS0&#8243;, O_RDWR | O_NOCTTY | O_NDELAY);

if (fd1 == -1 )
{
perror(&#8220;open_port: Unable to open /dev/ttyS0 &#8211; &#8220;);
}

else
{
fcntl(fd1, F_SETFL,0);

printf(&#8220;Port 1 has been sucessfully opened and %d is the file description\n&#8221;,fd1);
}

//Where, &#8220;/dev/ttyS0&#8221; is associated with COM1 port.

//With following code we send to device some bits:

wr=write(fd1,&#8221;ATZ\r&#8221;,4);

//And for reading response from device:

rd=read(fd1,buff,10);

printf(&#8220;Bytes sent are %d \n&#8221;,rd);

//At the end, close the connection:

close(fd1);

//Beg0 added: Liberation de la memoire allouée
free(buff);

return 0;
}