L2cap bind - invalid argument

L2cap bind - invalid argument

[Franko Danielos]

Hello

When I try to follow example from this site
http://people.csail.mit.edu/albert/bluez-intro/x559.html
I have an error while trying to bind. Error message is invalid argument.
My question: is it related with newest bluetooth or kernel?

I use linux mint 12.
Linux Kernel version 3.0.0 (but the same applies to 3.2.x)
Bluez version: 4.96

I tested it also on earlier version of Linux Mint with kernel 2.6.32 and
bluez 4.66 and that example works.
Any ideas?

Thank you

Re: L2cap bind - invalid argument

[Johan Hedberg]

Hi Franko,

On Thu, Apr 12, 2012, Franko Danielos wrote:
> When I try to follow example from this site
> http://people.csail.mit.edu/albert/bluez-intro/x559.html
> I have an error while trying to bind. Error message is invalid argument.
> My question: is it related with newest bluetooth or kernel?
> 
> I use linux mint 12.
> Linux Kernel version 3.0.0 (but the same applies to 3.2.x)
> Bluez version: 4.96
> 
> I tested it also on earlier version of Linux Mint with kernel 2.6.32 and
> bluez 4.66 and that example works.
> Any ideas?

That would be because the PSM value in the example is not valid. Newer
kernels (post 2.6.32) check for this properly:

        /* PSM must be odd and lsb of upper byte must be 0 */
        if ((psm & 0x0101) != 0x0001) {
                err = -EINVAL;
                goto done;
        }

Johan

Re: L2cap bind - invalid argument

[Franko Danielos]

Hi Johan,
Thank you for your response. Now I know that I should read more about
bluetooth technology.

Regards,
Danielos


Dnia 2012-04-13, pią o godzinie 11:40 +0300, Johan Hedberg pisze:
> Hi Franko,
> 
> On Thu, Apr 12, 2012, Franko Danielos wrote:
> > When I try to follow example from this site
> > http://people.csail.mit.edu/albert/bluez-intro/x559.html
> > I have an error while trying to bind. Error message is invalid argument.
> > My question: is it related with newest bluetooth or kernel?
> > 
> > I use linux mint 12.
> > Linux Kernel version 3.0.0 (but the same applies to 3.2.x)
> > Bluez version: 4.96
> > 
> > I tested it also on earlier version of Linux Mint with kernel 2.6.32 and
> > bluez 4.66 and that example works.
> > Any ideas?
> 
> That would be because the PSM value in the example is not valid. Newer
> kernels (post 2.6.32) check for this properly:
> 
>         /* PSM must be odd and lsb of upper byte must be 0 */
>         if ((psm & 0x0101) != 0x0001) {
>                 err = -EINVAL;
>                 goto done;
>         }
> 
> Johan
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