Arduino connect to NetBSD box woes

[freebsd]

Hello List,

I am using NetBSD 7.1.2 released (March 15, 2018) i386 on a box and 
noticed some serious issue with the Arduino and other dongles.

I have to reconnect the dongle to get the device "/dev/dtyU0" 
accessible.

This is quite annoying since it would mean that at every reboot I have 
to go to the machine and physically unplug and replug the Arduino.

I have another issue with a code which is 100% working on Linux but 
fails to work in 1 way on NetBSD:


int serialport_open(const char *serialport)
 {
  struct termios toptions;
  int fd;

  fd = open(serialport, O_RDWR | O_NOCTTY);

  if (fd == -1)
  {
    fprintf(stderr, "Serial port %s cannot be opened ... [ ERROR ]\n", 
serialport);
    return -1;
  }

    printf("Serial port 1 ... [ OPENED ]\n");

  /* get current serial port settings */
  if (tcgetattr(fd, &toptions) < 0) {
        perror("serialport_init: Couldn't get term attributes");
        return -1;
  }
  /* set 9600 baud both ways */
  cfsetispeed(&toptions, B9600);
  cfsetospeed(&toptions, B9600);

  /* 8 bits, no parity, no stop bits */
  toptions.c_cflag &= ~PARENB;

  toptions.c_cflag &= ~CSTOPB;

  toptions.c_cflag &= ~CSIZE;
  toptions.c_cflag |= CS8;

  /* no flow control */
  toptions.c_cflag &= ~CRTSCTS;

  /* Canonical mode */
  toptions.c_lflag |= ICANON; // this supposed to be off

  toptions.c_cflag |= CREAD | CLOCAL;  // turn on READ & ignore ctrl 
lines
  toptions.c_iflag &= ~(IXON | IXOFF | IXANY); // turn off s/w flow ctrl

 /* will break everything, these are here NOT to enable them */
 //toptions.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); // make raw
 //toptions.c_oflag &= ~OPOST; // make raw

  // see: http://unixwiz.net/techtips/termios-vmin-vtime.html
  toptions.c_cc[VMIN]  = 0;
  toptions.c_cc[VTIME] = 0;
  //toptions.c_cc[VTIME] = 20;

  /* commit the serial port settings */
  tcsetattr(fd, TCSANOW, &toptions);

    if( tcsetattr(fd, TCSAFLUSH, &toptions) < 0) {
        perror("init_serialport: Couldn't set term attributes");
        return -1;
    }
 return fd;
}


int serialport_read_until(int fd, char* buf, char until, int buf_max, 
int timeout)
{
    char b[1];  // read expects an array, so we give it a 1-byte array
    int i=0;
    do {
        int n = read(fd, b, 1);  // read a char at a time
        if( n==-1) return -1;    // couldn't read
        if( n==0 ) {
            usleep( 1 * 1000 );  // wait 1 msec try again
            timeout--;
            if( timeout==0 ) return -2;
            continue;
        }
#ifdef SERIALPORTDEBUG
        printf("serialport_read_until: i=%d, n=%d b='%c'\n",i,n,b[0]); 
// debug
#endif
        buf[i] = b[0];
        i++;
    } while( b[0] != until && i < buf_max && timeout>0 );

    buf[i] = 0;  // null terminate the string
    return 0;
}


int serialport_write(int fd, char *comm)
{
    char command[100];
    comm[strcspn(comm, "\r\n")] = 0;

    sprintf(command,"%s\n",comm);
    printf("Sending Command:>%s<\n",comm);

    int len = strlen(command);
    int n = write(fd, command, len);
    if( n!=len )
        return -1;
    return 0;
}

This works for RX (Receive data from the arduino) but no the serial 
write (once again the exact same hw works fine with the same code 
compiled on Linux). I guess NetBSD does something differently when 
opening and handling the serial port. In the write function I remove the 
incoming \r\n trash for security then complete the incoming command 
string with \n before writing it to serial.

Any ideas what can go wrong here?

Thanks.