Just now … I wrote my first ever blueZ code, a simple one though, that too, from an online  tutorial at

http://people.csail.mit.edu/albert/bluez-intro/c404.html

Its a nice tutorial for newbies like me to get started with blueZ.

First of all, I needed to setup my blueZ development environment. Since I use Fedora 10, I did the following

yum install -y bluez-libs bluez-libs-devel libgdbus libgdbus-devel

Also, one can manually install it from the source packages available at

www.bluez.org

The first code that I wrote is a simplescan.c which scans for bluetooth devices in proximity and displays its bluetooth address ( a 48-bit address unique for all bluetooth devices managed by IEEE). Here’s the following code :

include <stdio.h>

include <stdlib.h>

include <unistd.h>

include <sys/socket.h>

include <bluetooth/bluetooth.h>

include <bluetooth/hci.h>

include <bluetooth/hci_lib.h>

int main(int argc, char **argv)
{
inquiry_info *ii = NULL;
int max_rsp, num_rsp;
int dev_id, sock, len, flags;
int i;
char addr[19] = {0};
char name[248] = {0};

dev_id = hci_get_route(NULL);
sock = hci_open_dev( dev_id);
if (dev_id < 0 || sock < 0){
perror(“opening socket”);
exit(1);
}

len = 8;
max_rsp = 255;
flags = IREQ_CACHE_FLUSH;
ii = (inquiry_info*)malloc(max_rsp * sizeof(inquiry_info));

num_rsp = hci_inquiry(dev_id, len, max_rsp, NULL, &ii, flags);
if( num_rsp < 0 ) perror(“hci_inquiry”);

for (i = 0; i < num_rsp; i++) {
ba2str(&(ii+i)->bdaddr, addr);
memset(name, 0, sizeof(name));
if (hci_read_remote_name(sock, &(ii+i)->bdaddr, sizeof(name), name, 0) < 0)
strcpy(name, “[unknown]”);
printf(“%s %sn”, addr, name);
}
free(ii);
close( sock );
return 0;
}

Then to compile the code :

[rtnpro@xps blueZ]$ gcc -o simplescan simplescan.c -lbluetooth

Then to execute it :

[rtnpro@xps blueZ]$ ./simplescan

00:1D:98:78:A2:A1 Nokia 5310 XpressMusic

See the output, its my Nokia mobile phone.