Re: [Bluez-devel] Esco implementation patch

[Denis KENZIOR <denis.kenzior@trolltech.com>]

Mayank,

> How about the 2-EV* and 3-EV* packet types? The spec says that a 0 for
> these bits means they have been enabled. Shouldn't you also check for their
> support in the feature mask?

Good question.  I'm not entirely sure of this, however I did not interpret the 
specification in this manner.  All it says is that there is a specific 
feature mask to disable 2-EV and 3-EV packets.  There is nothing to say 
whether or not they are explicitly enabled.  Also the examples in the 
specification use the esco feature masks in the same manner as I do.  So I 
would assume that if EV3 support is not enabled, then 2-EV3 and 3-EV3 packets 
will not be used by the controller as well.  However, I could be wrong.

>
> > I've tested it on several machines here, including eSco->eSco
> > connection, eSco->sco connection for both incoming and outgoing
> > scenarios, everything seems fine, however I'm sure more testing is
> > required.
>
> How did you mangage to set up an eSCO since you are using only HV* packet
> types (ESCO_PTYPE_MASK)? Or is it because the 2-EV* and 3-EV* bits are "0"
> thus the controller thinks you want to enable those packet types?

Well, it comes down to what the controller labels as an eSCO connection.  E.g. 
the link_type returned in the connection complete and sync connection 
complete events.  Doing BlueZ<->BlueZ which both use the patch, I get 
link_type of eSCO.  Doing BlueZ<->BlueZ with one end not using the patch, I 
get a link_type of SCO.  Perhaps it is the particular hardware I'm using?

Setup is a STLC2500 serial device connected to a BT1.2 USB dongle on a 
non-patched kernel and a BT 2.0 USB dongle on a patched kernel.

Regards,
-Denis


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