[ts-7000] SocketModem problem

["alipiec" <>]

I have TS-MODEM2 additional board with MultiTech socket modem on it.
The device is recognized at boot procedure. It's visible on
/dev/tty/3. So until this moment everything looks fine. The board is
responding - because I have RTC on it and date is backed up during
power off time.

I tried to send any command: "ATZ\r" and "AT\r" and "AT+WOPEN=1\r" and
modem doesn't seems to respond. Serial settings for /dev/tty/3 are:
baudrate 115200, 8N1. What's wrong? Modem should respond "OK". I got
nothing.
What could be wrong with following code?

Alus
===========

/*
RS simple test
Arkadiusz Lipiec - arkadiusz.lipiec AT NO_SPAM gazeta.pl
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>

#include <termios.h>
#include <sys/ioctl.h>
#include <sys/time.h>

int fd;    //! RS file descriptor

int rs_open()
{
   struct termios options;

    fd = open("/dev/tts/3", O_RDWR | O_NOCTTY | O_NONBLOCK);

   if(fd == -1)
   {    
        perror("cannot open port\n");
        return fd;
   }

   fcntl(fd, F_SETFL, FASYNC);

   tcgetattr(fd, &options);
   bzero(&options, sizeof(options));
   options.c_cflag |= (CS8 | B115200 | CREAD | CLOCAL);

   // Enable data to be processed as raw input 
   options.c_lflag &= ~(ICANON | ECHO | ISIG);
   options.c_iflag = IGNPAR;
   options.c_oflag = 0;
   tcflush(fd, TCIFLUSH);
   
   // Set the new options for the port
   tcsetattr(fd, TCSANOW, &options);
   return 0;
}


// timeout in ms...
int receive_data(int fd, unsigned char* rcvbuffer, int buflen, int
timeout)
{
   unsigned long now;
   unsigned long diff;
   int i=0;

   int bytes;
   struct timeval tv;
   struct timezone tz;

   gettimeofday(&tv, &tz);
   now = tv.tv_sec * 1000 + (tv.tv_usec/1000);

   diff = 0;
   while(diff < (unsigned long) timeout)
   {
        gettimeofday(&tv, &tz);
        diff = ((tv.tv_sec * 1000) + (tv.tv_usec/1000) - now);
        ioctl(fd, FIONREAD, &bytes);
                
            if(bytes > 0 && i < buflen)
        {
                    read(fd, rcvbuffer+i, bytes);
                    i+=bytes;
                }
          usleep(1);
   }

   return i;
}


void rs_close()
{
        if(fd != -1 && fd != 0)
                { close(fd); }
}


//-----------------------------------------------
int main()
{
        int i,j,k;
        unsigned char buf[512];         // buffer

        if(rs_open() != 0)
        {
                perror("COM problem\n");
                exit(EXIT_FAILURE);
        }

        j = sprintf(buf, "ATZ\r");

        k = write(fd, buf, j); 
    memset(buf, 0, sizeof(buf));
    i = receive_data(fd, buf, sizeof(buf), 3000);
    if(i > 0)
        {
       printf("RESPONSE: %s\n", buf);
        }

        rs_close();
        return 0;
}










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