Subject: Re: [Bluez-devel] Regarding a2recv
From: Marcel Holtmann <marcel@holtmann.org>
To: bluez-devel@lists.sourceforge.net
In-Reply-To: <20050509025805.331c34c7.henryk@ploetzli.ch>
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Date: Mon, 09 May 2005 03:03:47 +0200

Hi Henryk,

> Am Mon, 09 May 2005 02:01:36 +0200 schrieb Marcel Holtmann:
> 
> > I suspect that it is waiting for a role switch to happen.
> 
> Either that isn't it or I'm doing it wrong. There should be two
> principal ways to archieve this, right? 
> 
> a) hciconfig hci0 lm master
> If I do this I don't get a complete connection at all. hcidump shows
> > HCI Event: Connect Request (0x04) plen 10
> < HCI Command: Accept Connection Request (0x01|0x0009) plen 7
>     bdaddr 00:08:F4:35:05:3C role 0x00
>     Role: Master
> > HCI Event: Command Status (0x0f) plen 4
> > HCI Event: Role Change (0x12) plen 8
> > HCI Event: Connect Complete (0x03) plen 11
> but nothing shows up on a2recv. 
> 
> b) (I got this from the bthid code)
> getsockopt(fd, SOL_L2CAP, L2CAP_LM, &opt, &len)
> opt |= L2CAP_LM_MASTER;
> setsockopt(fd, SOL_L2CAP, L2CAP_LM, &opt, sizeof(opt))
> 
> I'm not sure on which fd I should apply this. If I do it on the streamfd
> right after it has been established the behaviour is just as normal
> (e.g. 6 second hang, then disconnect).
> 
> If I do it with the listening socket right in the beginning I get the
> same as with hciconfig above. (I swear I got a "Role change not allowed"
> message from kdebluetoothd somewhere in between, but I can't reproduce
> that.)

you must do it on the HCI level at the correct time. Look at the
function hci_switch_role() for more details.

Regards

Marcel


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