[Bluez-users] connectionless L2CAP

[Bluez-users] connectionless L2CAP

[Aleksandar Kanchev]

Hello,

how can I broadcast a data packet ?
And the connectionless mode of the l2test isn't actually connectionless, 
for example:
$ ./l2test -D -N 1 -s 00:04:3E:81:14:F8
l2test[1279]: Can't connect: Host is down (112)

I just want to broadcast a data packet and I don't care if the remote 
end got it or not (i.e. connectionless ACL). Will someone  please 
explain me how can I do that and also a programming example would be great.

Thanks



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Re: [Bluez-users] connectionless L2CAP

[Marcel Holtmann]

Hi Aleksandar,

> how can I broadcast a data packet ?
> And the connectionless mode of the l2test isn't actually connectionless, 
> for example:
> $ ./l2test -D -N 1 -s 00:04:3E:81:14:F8
> l2test[1279]: Can't connect: Host is down (112)
> 
> I just want to broadcast a data packet and I don't care if the remote 
> end got it or not (i.e. connectionless ACL). Will someone  please 
> explain me how can I do that and also a programming example would be great.

this is not really working, because if there is no ACL link, then there
exists no piconet. And without a piconet no air transmission.

Regards

Marcel




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Re: [Bluez-users] connectionless L2CAP

[Aleksandar Kanchev]

Hello Marcel,

I'm actually trying to send a data packet between 2 bluetooth devices 
over 100 meters. I haven't went really deep into the bluetooth specs, 
but I assume that because of the long range a connection might not be 
possible, so that's why I just want to broadcast some packets and hope 
that some will arrive at the other end. Is this possible ?

Btw./l2test with 00:00:00:00:00:00 fails too, but the bluetooth baseband 
specification section 3.3 says that "ACL packets not addressed to a 
specific slave are considered as broadcast packets and are read by every 
slave". I have 1 device in range (I can see it with hcitool scan, l2test 
succeeds with that device).

Thanks

Marcel Holtmann wrote:

>Hi Aleksandar,
>
>  
>
>>how can I broadcast a data packet ?
>>And the connectionless mode of the l2test isn't actually connectionless, 
>>for example:
>>$ ./l2test -D -N 1 -s 00:04:3E:81:14:F8
>>l2test[1279]: Can't connect: Host is down (112)
>>
>>I just want to broadcast a data packet and I don't care if the remote 
>>end got it or not (i.e. connectionless ACL). Will someone  please 
>>explain me how can I do that and also a programming example would be great.
>>    
>>
>
>this is not really working, because if there is no ACL link, then there
>exists no piconet. And without a piconet no air transmission.
>
>Regards
>
>Marcel
>
>
>
>
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>This SF.net email is sponsored by: Splunk Inc. Do you grep through log files
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>searching your log files as easy as surfing the  web.  DOWNLOAD SPLUNK!
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>Bluez-users@lists.sourceforge.net
>https://lists.sourceforge.net/lists/listinfo/bluez-users
>
>  
>



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Re: [Bluez-users] connectionless L2CAP

[Marcel Holtmann]

Hi Aleksandar,

> I'm actually trying to send a data packet between 2 bluetooth devices 
> over 100 meters. I haven't went really deep into the bluetooth specs, 
> but I assume that because of the long range a connection might not be 
> possible, so that's why I just want to broadcast some packets and hope 
> that some will arrive at the other end. Is this possible ?

what's the problem with 100 meters range. Use a pair of class 1 dongles
and you are fine.

> Btw./l2test with 00:00:00:00:00:00 fails too, but the bluetooth baseband 
> specification section 3.3 says that "ACL packets not addressed to a 
> specific slave are considered as broadcast packets and are read by every 
> slave". I have 1 device in range (I can see it with hcitool scan, l2test 
> succeeds with that device).

You still need the piconet. No piconet no data transfer over the air.

Regards

Marcel




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