how to send data via bluetooth in linux

#include <stdio.h> /* Standard input/output definitions */
#include <string.h> /* String function definitions */
#include <unistd.h> /* UNIX standard function definitions */
#include <fcntl.h> /* File control definitions */
#include <errno.h> /* Error number definitions */
#include <termios.h> /* POSIX terminal control definitions */
 
main()
{
int fd;
struct termios options;
 
int i ;
unsigned char data[20] = { 0x40, 0x28, 0x6b, 0xfe,
0x00, 0x00, 0x00, 0x00,
0x00, 0x23, 0x04, 0x00,
0x00, 0x00, 0x00, 0x00,
0xd9, 0xff, 0xff, 0xff} ;
 
// linux
fd = open("/dev/rfcomm0", O_RDWR | O_NOCTTY | O_NONBLOCK);
 
// cygwin
//fd = open("/dev/com1", O_RDWR | O_NOCTTY | O_NONBLOCK);
//fcntl(fd, F_SETFL, 0);
 
/* get the current options */
tcgetattr(fd, &options);
 
cfsetispeed(&options, B57600);
cfsetospeed(&options, B57600);
 
/* set raw input, 1 second timeout */
options.c_cflag |= (CLOCAL | CREAD);
options.c_oflag &= ~OPOST;
options.c_cc[VMIN] = 0;
options.c_cc[VTIME] = 10;
 
 
options.c_cflag &= ~PARENB; /* Clear parity enable */
options.c_iflag &= ~INPCK; /* Enable parity checking */
options.c_cflag &= ~CSTOPB;
options.c_cflag &= ~CSIZE;
options.c_cflag |= CS8;
 
options.c_cflag &= ~CRTSCTS;
 
// options.c_iflag &= ~(IXON | IXOFF | IXANY); /* no flow control */
 
options.c_oflag &= ~(IXON | IXOFF | IXANY); /* no flow control */
 
options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
options.c_oflag &= ~OPOST; /* No output processing */
options.c_oflag &= ~ONLCR; /* Don't convert linefeeds */
 
/* Miscellaneous stuff */
options.c_cflag |= (CLOCAL | CREAD); /* Enable receiver, set local */
/* Linux seems to have problem with the following ??!! */
options.c_cflag |= (IXON | IXOFF); /* Software flow control */
options.c_lflag = 0; /* no local flags */
options.c_cflag |= HUPCL; /* Drop DTR on close */
 
/* Setup non blocking, return on 1 character */
options.c_cc[VMIN] = 0;
options.c_cc[VTIME] = 1;
 
/* Clear the line */
tcflush(fd,TCIFLUSH);
 
/* Update the options and do it NOW */
if (tcsetattr(fd,TCSANOW,&options) != 0) {
perror("SetupSerial 3");
return(0);
}
 
write(fd, data, 20 ) ;
close(fd);
return 0 ;
}

                                              

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