Re: [Bluez-devel] sdp_connect thread safe?

[Marcel Holtmann <marcel@holtmann.org>]

Hi Peter,

> > > The normal behaviour is that the chip will reply with an error event (like 
> > > command dissallowed) for the second connection attempt. I think there was 
> > > some discussion about this some time ago. The only way to come around this 
> > > is a complicated buffering for HCI commands inside BlueZ. It will require 
> > > the stack to hold a create connection command in the queue when it gets an 
> > > error response for a create connection command and re-issue it once it 
> > > gets an connection complete or connection fail event.
> > 
> > if you wanna really support this, then you have to implement it in the
> > L2CAP layer. Doing it inside HCI would mess up a lot of things and I
> > would always reject this. However feel free to send in patches to
> > implement this inside L2CAP.
> 
> No, I don't want to implement this. We've done this once for a project 
> (not BlueZ related) and it was a pain ;-). May be you're right that L2CAP 
> is the appropriate layer because it is connection oriented. But 
> currently my knowledge about the insides of BlueZ is simply to small to 
> comment on this.  

doing it on HCI level can easily mess up things and as I said, I would
reject any attempt to push such thing into the mainline kernel.

However I am open for a L2CAP based solution. Actually is not that
complex. Take a look at l2cap_connect_cfm() and in case of a specific
error you need to issue l2cap_do_connect() again. Now you only need to
take care of the correct timeout handling and stop after for example
three failed attempts to avoid an endless loop.

Regards

Marcel



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