PAN profile BUG?

Bluez-devel Olivier Dole 3 participants 8 messages Dec 11, 2006 – Dec 12, 2006 Bluetooth drivers

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Olivier Dole

author

2006-12-11 14:58 UTC #0 lore raw

Hello,

I work on PAN profile and there is maybe a bug if we refer to the specs (PAN profile v1.0).
I've run a PANU server with pand daemon on my Linux machine and I was able to connect 2 different devices to this server. And according to the specification (page 15):
2.1.3 PANU-PANU
In this scenario, a point to point connection between two PANUs allows direct communication between these two nodes only.

So the second connection should fail, isn't it ? I suppose (not test it) that the same behavior occurs with GN or NAP role. I mean that you can connect more than 7 peers to the server.

I have a look at pand source code and see that the changes require to fix this behavior is not completly trivial. A solution may be to use 2 global variable: "max_connection" (which may be set to 1 or 7 if PANU or GN/NAP role is run) and "connected" to know the number of currently connected device to the server. Unfortunately fork() call prevent us from correctly keeping up to date the second variable. So I would have to replace fork() call by pthread_create() call to try to keep my 2nd variable up to date. And this lead to many changes in do_listen() function.
So regarding that, I have two questions:
- Can someone with more Bluetooth knowledge than me confirm that is a bug ?
- Has anyone a better/simpler solution than me to fix this if that's really a bug. I can do the fix but I'd like to choose the best solution for everyone.

Regards,

Olivier DOLE

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Marcel Holtmann

maintainer

2006-12-11 15:03 UTC #1 lore raw

Hi Olivier,

Quoted 9 lines

I work on PAN profile and there is maybe a bug if we refer to the specs (PAN profile v1.0).
I've run a PANU server with pand daemon on my Linux machine and I was able to connect 2 different devices to this server. And according to the specification (page 15):
2.1.3 PANU-PANU
In this scenario, a point to point connection between two PANUs allows direct communication between these two nodes only.

Quoted 3 lines

So the second connection should fail, isn't it ? I suppose (not test it) that the same behavior occurs with GN or NAP role. I mean that you can connect more than 7 peers to the server.

I can't follow you and I also don't see a problem here. Everything depends on the way you setup the bridge or the routing for the bnep0 Ethernet devices.

Regards

Marcel

Olivier Dole

author

2006-12-11 15:09 UTC #2 lore raw

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Marcel Holtmann

maintainer

2006-12-11 20:51 UTC #3 lore raw

Hi Olivier,

Quoted 4 lines

The problem from my point of view is that if you run a PANU server (so no need of Ethernet bridging), you must only have one slave and you are able to have 2 slaves (or more) connected to the server... Even if that is not really a bug, it does not strictly follow PAN specifications.

so you wanna have a mode that stops listening on the PSM 15 when it has a bnep0 connection and starts again once this connection has been terminated. It is doable, but I am not sure if it is worth changing the source code this way and first you have to convince me that we would fail the qualification tests if we keep supporting this. Otherwise it is a nice feature of BlueZ, because all this UUID stuff in the BNEP specification is crap anyway.

Regards

Marcel

Olivier Dole

author

2006-12-12 09:00 UTC #4 lore raw

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Olivier Dole

author

2006-12-12 10:05 UTC #5 lore raw

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Nelson Murilo

2006-12-11 16:45 UTC #6 lore raw

[Bluez-devel] Connection timeout

In reply to Olivier Dole

Hi listers,

I usually use bemused solution to make presentations, =

after upgrade my bluez stack (I=B4m using kernel 2.6.17.6), it doesn=B4t =

work anymore, after around 1 or 2 minutes my cellphone are disconected by laptop, and I have reconnect to continue chance slides.

I looked dbus.txt to try how to fix it, but no progress at now.

Somebody have any hints? =

Thanks in advance,

./nelson -murilo

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Marcel Holtmann

maintainer

2006-12-11 20:46 UTC #7 lore raw

Re: [Bluez-devel] Connection timeout

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