2011-01-20 15:44:21

by Ulrich Bürgi

[permalink] [raw]
Subject: Problem with inquiry result with rssi

Hello everyone,

I'm encountering a strange behavior regarding inquiry results. I'm
working on a C program, which has a method called 'scanner_start'. This
method performs an inquiry and reports the corresponding addresses and
RSSI values of all results.
When I just call this method and do nothing else, it works as intended.
However, if I do anything prior to that, I only get 'normal' inquiry
results without RSSI.

As example, this works:
/* do nothing here */
scanner_start();
/* do something here */

whereas this fails:
/* do nothing here */
int i;
scanner_start();
/* do something here */

Below is the complete source code needed to reproduce this behavior.

I cannot really imagine, how an unused declaration can have an impact on
the inquiry results. Does anybody have a clue, how this could be?

Thank you,
Ulrich

--

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/poll.h>
#include <sys/ioctl.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>

static void print_result(bdaddr_t *bdaddr, char has_rssi, int rssi)
{
char addr[18];

ba2str(bdaddr, addr);

printf("%17s", addr);
if(has_rssi)
printf(" RSSI:%d", rssi);
else
printf(" RSSI:n/a");
printf("\n");
fflush(NULL);
}


static void scanner_start()
{
int dev_id, sock = 0;
struct hci_filter flt;
inquiry_cp cp;
unsigned char buf[HCI_MAX_EVENT_SIZE], *ptr;
hci_event_hdr *hdr;
char canceled = 0;
inquiry_info_with_rssi *info_rssi;
inquiry_info *info;
int results, i, len;
struct pollfd p;

dev_id = hci_get_route(NULL);
sock = hci_open_dev( dev_id );
if (dev_id < 0 || sock < 0) {
perror("Can't open socket");
return;
}

hci_filter_clear(&flt);
hci_filter_set_ptype(HCI_EVENT_PKT, &flt);
hci_filter_set_event(EVT_INQUIRY_RESULT, &flt);
hci_filter_set_event(EVT_INQUIRY_RESULT_WITH_RSSI, &flt);
hci_filter_set_event(EVT_INQUIRY_COMPLETE, &flt);
if (setsockopt(sock, SOL_HCI, HCI_FILTER, &flt, sizeof(flt)) < 0) {
perror("Can't set HCI filter");
return;
}

if (hci_send_cmd(sock, OGF_HOST_CTL, OCF_WRITE_INQUIRY_MODE,
WRITE_INQUIRY_MODE_RP_SIZE, &cp) < 0) {
perror("Can't set inquiry mode");
return;
}

memset (&cp, 0, sizeof(cp));
cp.lap[2] = 0x9e;
cp.lap[1] = 0x8b;
cp.lap[0] = 0x33;
cp.num_rsp = 0;
cp.length = 0x30;

printf("Starting inquiry with RSSI...\n");

if (hci_send_cmd (sock, OGF_LINK_CTL, OCF_INQUIRY, INQUIRY_CP_SIZE,
&cp) < 0) {
perror("Can't start inquiry");
return;
}

p.fd = sock;
p.events = POLLIN | POLLERR | POLLHUP;

while(!canceled) {
p.revents = 0;

/* poll the BT device for an event */
if (poll(&p, 1, -1) > 0) {
len = read(sock, buf, sizeof(buf));

if (len < 0)
continue;
else if (len == 0)
break;

hdr = (void *) (buf + 1);
ptr = buf + (1 + HCI_EVENT_HDR_SIZE);

results = ptr[0];

switch (hdr->evt) {
case EVT_INQUIRY_RESULT:
for (i = 0; i < results; i++) {
info = (void *)ptr + (sizeof(*info) * i) + 1;
print_result(&info->bdaddr, 0, 0);
}
break;

case EVT_INQUIRY_RESULT_WITH_RSSI:
for (i = 0; i < results; i++) {
info_rssi = (void *)ptr + (sizeof(*info_rssi) * i) + 1;
print_result(&info_rssi->bdaddr, 1, info_rssi->rssi);
}
break;

case EVT_INQUIRY_COMPLETE:
canceled = 1;
break;
}
}
}
close(sock);
}

int main(int argc, char **argv)
{
//int i; /* causes inq. result to have no rssi value */
scanner_start();
return 0;
}


2011-01-21 09:14:46

by Ulrich Bürgi

[permalink] [raw]
Subject: Re: Problem with inquiry result with rssi

Hi Vinicius,


>> if (hci_send_cmd(sock, OGF_HOST_CTL, OCF_WRITE_INQUIRY_MODE,
>> WRITE_INQUIRY_MODE_RP_SIZE,&cp)< 0) {
>
> Taking a look at your code, a few things look out of place: you are
> using cp uninitialized, it is expecting a write_inquiry_mode_cp, not a
> inquiry_cp and the plen parameter seems wrong.

Silly me! How could I have missed this?
Well, now I use write_inquiry_mode_cp with a mode set to 0x01 and the
proper plen.
Everything works as expected!

Thank you very much for the quick help!
Ulrich

2011-01-21 04:58:44

by Vinicius Costa Gomes

[permalink] [raw]
Subject: Re: Problem with inquiry result with rssi

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