[Bluez-devel] hci inquiry error with name scan

[Bluez-devel] hci inquiry error with name scan

[Avaited]

hi all 

I am facing a big problem with hci layer process. I have developed a platform
and http wraper for bluetooth services using bluez.  I am searching all device
present in vicinity by using hci.c function 'hci_scan()'. later for each
number(BDADDR) i am searching its name by hci_read_remote_name(). Most of the
time I am getting right name(i.e. what ever name i am giving to my devices ) But
some time name get swaped with some one. Lisk in my case my mobile name was
SHARK and my Machine name was VIKAS [0], VIKAS[1], my friends mobile was GOLD,
SILVER. but when I had done scan name it returned me my mobile,s name as
VIKAS[1]. I am surprise why this happened.

Is there any problem with present bluez stack I am using
bluez-bluefw-1.0-6
bluez-pin-0.23-3
bluez-hcidump-1.11-1
bluez-libs-2.10-2
bluez-utils-2.10-2.1
on redhat 4.0 Enterprise Edition
with kernel 2.6.9-5.EL i386
int getScanName(bdaddr_t *device_bt,char * device_name,bdaddr_t *dongle_bt)
{
        if((s = GetScanSock(dongle_bt)) < 0)    // this will connect to local dongle
        {
                ERR_LOG(ERR,"Unable to open socket");
                return -s;
        }
        if(hci_read_remote_name(s, device_bt,sizeof(device_name),device_name,0) < 0)
        {
                ERR_LOG(DBG,"No Name found");
                close(s);
                return -NOTFOUND;
        }
        ERR_LOG(DBG,"Name of Device hci scan  [%s] DeviceBT
[%s]",device_name,device_bt);
        close(s);
        return 0;
}
this function get called for each device found in scan.


I am in deep trouble to know what is problem with this.

Please help


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Re: [Bluez-devel] hci inquiry error with name scan

[Andreas Gaufer]

Hi Avaited,

i believe this is a bug in hci.c in the bluez-libs package. It returns
wrong names if multiple hci_read_remote_name calls are done in a short
period of time.

hci_send_req which is used by hci_read_remote_name returns data of the
first EVT_REMOTE_NAME_REQ_COMPLETE that occurs on the device even if it
does not match the bdaddres that was requested. 

This problem was also already noticed by Sjoerd Simons in June 2004 and
sent to this list with the subject "btaddr <-> name bug ?" (1)

I prepared a patch that should fix that problem. I will provide that
patch on this list as soon as I'm finished with stress-testing it.

Greetings

Andy


1) http://thread.gmane.org/gmane.linux.bluez.devel/2489/focus=2491


On Tue, 26 Dec 2006 04:47:47 +0000 (UTC)
Avaited <compuvikas@gmail.com> wrote:

> hi all 
> 
> I am facing a big problem with hci layer process. I have developed a platform
> and http wraper for bluetooth services using bluez.  I am searching all device
> present in vicinity by using hci.c function 'hci_scan()'. later for each
> number(BDADDR) i am searching its name by hci_read_remote_name(). Most of the
> time I am getting right name(i.e. what ever name i am giving to my devices ) But
> some time name get swaped with some one. Lisk in my case my mobile name was
> SHARK and my Machine name was VIKAS [0], VIKAS[1], my friends mobile was GOLD,
> SILVER. but when I had done scan name it returned me my mobile,s name as
> VIKAS[1]. I am surprise why this happened.
> 
> Is there any problem with present bluez stack I am using
> bluez-bluefw-1.0-6
> bluez-pin-0.23-3
> bluez-hcidump-1.11-1
> bluez-libs-2.10-2
> bluez-utils-2.10-2.1
> on redhat 4.0 Enterprise Edition
> with kernel 2.6.9-5.EL i386
> int getScanName(bdaddr_t *device_bt,char * device_name,bdaddr_t *dongle_bt)
> {
>         if((s = GetScanSock(dongle_bt)) < 0)    // this will connect to local dongle
>         {
>                 ERR_LOG(ERR,"Unable to open socket");
>                 return -s;
>         }
>         if(hci_read_remote_name(s, device_bt,sizeof(device_name),device_name,0) < 0)
>         {
>                 ERR_LOG(DBG,"No Name found");
>                 close(s);
>                 return -NOTFOUND;
>         }
>         ERR_LOG(DBG,"Name of Device hci scan  [%s] DeviceBT
> [%s]",device_name,device_bt);
>         close(s);
>         return 0;
> }
> this function get called for each device found in scan.
> 
> 
> I am in deep trouble to know what is problem with this.
> 
> Please help
> 
> 
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Re: [Bluez-devel] hci inquiry error with name scan

[Vikas Sinha]

[-- Attachment #1.1: Type: text/plain, Size: 4110 bytes --]

Thanks Andreas,
I am waiting for ur patch. If there anything I can do please tell me. I took
other way to overcome this problem. I have allocated MAX space for array of
inquery structure (i.e. 256) and then doing inquiry and making it memset
zero after using its result.  I think ur right .



On 6/1/07, Andreas Gaufer <Andreas.Gaufer@bluecellnetworks.com> wrote:
>
> Hi Avaited,
>
> i believe this is a bug in hci.c in the bluez-libs package. It returns
> wrong names if multiple hci_read_remote_name calls are done in a short
> period of time.
>
> hci_send_req which is used by hci_read_remote_name returns data of the
> first EVT_REMOTE_NAME_REQ_COMPLETE that occurs on the device even if it
> does not match the bdaddres that was requested.
>
> This problem was also already noticed by Sjoerd Simons in June 2004 and
> sent to this list with the subject "btaddr <-> name bug ?" (1)
>
> I prepared a patch that should fix that problem. I will provide that
> patch on this list as soon as I'm finished with stress-testing it.
>
> Greetings
>
> Andy
>
>
> 1) http://thread.gmane.org/gmane.linux.bluez.devel/2489/focus=2491
>
>
> On Tue, 26 Dec 2006 04:47:47 +0000 (UTC)
> Avaited <compuvikas@gmail.com> wrote:
>
> > hi all
> >
> > I am facing a big problem with hci layer process. I have developed a
> platform
> > and http wraper for bluetooth services using bluez.  I am searching all
> device
> > present in vicinity by using hci.c function 'hci_scan()'. later for each
> > number(BDADDR) i am searching its name by hci_read_remote_name(). Most
> of the
> > time I am getting right name(i.e. what ever name i am giving to my
> devices ) But
> > some time name get swaped with some one. Lisk in my case my mobile name
> was
> > SHARK and my Machine name was VIKAS [0], VIKAS[1], my friends mobile was
> GOLD,
> > SILVER. but when I had done scan name it returned me my mobile,s name as
> > VIKAS[1]. I am surprise why this happened.
> >
> > Is there any problem with present bluez stack I am using
> > bluez-bluefw-1.0-6
> > bluez-pin-0.23-3
> > bluez-hcidump-1.11-1
> > bluez-libs-2.10-2
> > bluez-utils-2.10-2.1
> > on redhat 4.0 Enterprise Edition
> > with kernel 2.6.9-5.EL i386
> > int getScanName(bdaddr_t *device_bt,char * device_name,bdaddr_t
> *dongle_bt)
> > {
> >         if((s = GetScanSock(dongle_bt)) < 0)    // this will connect to
> local dongle
> >         {
> >                 ERR_LOG(ERR,"Unable to open socket");
> >                 return -s;
> >         }
> >         if(hci_read_remote_name(s,
> device_bt,sizeof(device_name),device_name,0) < 0)
> >         {
> >                 ERR_LOG(DBG,"No Name found");
> >                 close(s);
> >                 return -NOTFOUND;
> >         }
> >         ERR_LOG(DBG,"Name of Device hci scan  [%s] DeviceBT
> > [%s]",device_name,device_bt);
> >         close(s);
> >         return 0;
> > }
> > this function get called for each device found in scan.
> >
> >
> > I am in deep trouble to know what is problem with this.
> >
> > Please help
> >
> >
> >
> -------------------------------------------------------------------------
> > Take Surveys. Earn Cash. Influence the Future of IT
> > Join SourceForge.net's Techsay panel and you'll get the chance to share
> your
> > opinions on IT & business topics through brief surveys - and earn cash
> >
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> > _______________________________________________
> > Bluez-devel mailing list
> > Bluez-devel@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/bluez-devel
>
>
>
>
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-- 
Impossible
itself contain
I M Possible

Vikas

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