hi mr holtmann,

i have problem with hci_create_connection function at line 120.
here's the code , when program comes to the line of hci_create_connection function
it always says :

#./simplescan
scanning ...
00:0E:6D:3F:E0:73 ozkan
Cannot create connection

simplescan.c

#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <signal.h>
#include <termios.h>
#include <fcntl.h>
#include <getopt.h>
#include <asm/types.h>
#include <netinet/in.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 };
int measure ;

    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));
    printf("scanning ...\n");
    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 %s\n", addr, name);
  measure = read_rssi(&(ii+i)->bdaddr);
  printf("the RSSI measure for %s is %d",name,measure);
    }

    free( ii );
    close( sock );
    return 0;
}

static int find_conn(int s, int dev_id, long arg)
{
struct hci_conn_list_req *cl;
struct hci_conn_info *ci;
int i;

if (!(cl = malloc(10 * sizeof(*ci) + sizeof(*cl)))) {
perror("Can't allocate memory");
exit(1);
}
cl->dev_id = dev_id;
cl->conn_num = 10;
ci = cl->conn_info;

if (ioctl(s, HCIGETCONNLIST, (void*)cl)) {
perror("Can't get connection list");
exit(1);
}

for (i=0; i < cl->conn_num; i++, ci++)
if (!bacmp((bdaddr_t *)arg, &ci->bdaddr))
return 1;
return 0;
}

int read_rssi(char* address) {
int cc = 0;
int dd;
int dev_id;
uint16_t handle;
struct hci_conn_info_req *cr;
struct hci_request rq;
read_rssi_rp rp;
bdaddr_t bdaddr;

str2ba(address, &bdaddr);

dev_id = hci_for_each_dev(HCI_UP, find_conn, (long) &bdaddr);
if (dev_id < 0) {
    dev_id = hci_get_route(&bdaddr);
    cc = 1;
}
if (dev_id < 0) {
    printf("Device not available\n");
    exit(1);
}

dd = hci_open_dev(dev_id);
if (dd < 0) {
    printf("Cannot open device\n");
    exit(1);
}
// ***************************   PROBLEM HERE *************************
if (cc) {
    if (hci_create_connection(dd, &bdaddr, 0x0008 | 0x0010, 0, 0, &handle, 25000) < 0) {
      printf("Cannot create connection\n");
      close(dd);
      exit(1);
    }
}
// ***************************** *****************************************
cr = malloc(sizeof(*cr) + sizeof(struct hci_conn_info));
if (!cr) {
    printf("Could not allocate memory\n");
    exit(1);
}

bacpy(&cr->bdaddr, &bdaddr);
cr->type = ACL_LINK;
if (ioctl(dd, HCIGETCONNINFO, (unsigned long) cr) < 0) {
    printf("Get connection info failed\n");
    exit(1);
}

memset(&rq, 0, sizeof(rq));
rq.ogf    = OGF_STATUS_PARAM;
rq.ocf    = OCF_READ_RSSI;
rq.cparam = &cr->conn_info->handle;
rq.clen   = 2;
rq.rparam = &rp;
rq.rlen   = READ_RSSI_RP_SIZE;

if (hci_send_req(dd, &rq, 100) < 0) {
    printf("Read RSSI failed\n");
    exit(1);
}

if (rp.status) {
    printf("Read RSSI returned (error) status 0x%2.2X\n", rp.status);
    exit(1);
}

if (cc) {
    hci_disconnect(dd, handle, 0x13, 10000);
}

close(dd);
free(cr);
printf("My RSSI is : %d",rp.rssi);
return rp.rssi ;
}

can you give me some advise to resolve this problem, ? do you think my ptype or clkoffset are false ?

i will be very grateful for a little help..

thanks,