From: Robert Siemer <Robert.Siemer@backsla.sh>
To: bluez-devel@lists.sourceforge.net
Subject: Re: [Bluez-devel] Re: Jumpy cursor with Wacom Graphire Bluetooth
Message-ID: <20051128022901.GK15156@polar.elf12.net>
References: <20051127184902.GD15156@polar.elf12.net> <1133119580.13629.13.camel@blade> <20051127213835.GF15156@polar.elf12.net> <1133128569.13629.28.camel@blade> <20051127230444.GG15156@polar.elf12.net> <1133133083.13629.43.camel@blade> <20051127234927.GI15156@polar.elf12.net> <1133136167.13629.58.camel@blade> <20051128015303.GJ15156@polar.elf12.net> <1133143721.13629.67.camel@blade>
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Reply-To: bluez-devel@lists.sourceforge.net
Date: Mon, 28 Nov 2005 03:29:01 +0100

> The encryption and authentication should be no problem at all. I used
> this for most devices, but it is off for a mouse or pointer like device
> by default. The reason is that these devices can't input their PIN and a
> default PIN is weak anyhow.

Of course. But if you can assure that during pairing nobody was
sniffing, you are on the safe side afterwards. That means open 1 minute
only or open during the whole product lifetime...

> Check with "hcidump -X -V" what happens.

I will, but not this night... (-:

> > The switch between the modes is done with a "set report mode feature"
> > call. 
> 
> Question is what is default?

HID. Because the wacom people told me and addionally the tablet actually
works with bluez. - But it does not send packets until the mouse/pen got
moved at least 6 "pixel" in one direction. (See my first email in this
thread). That means: I move the mouse, but hcidump is not showing
anything. - I have to move it some millimeters before it does see
something...

If it's not HID, wacom mode wouldn't it be, either. 

> > > >         Attribute 0x0206
> > > >                 Sequence
> > > >                         Sequence
> > > >                                 UINT8 0x22
> > > >                                 String 05 01 09 02 a1 01 85 02 09 01 a1
> > > > 00 05 09 19 01 29 03 15 00 25 01 95 03 75 01 81 02 95 01 75 05 81 01 05
> > > > 01 09 30 09 31 09 38 15 81 25 7f 75 08 95 03 81 06 c0 c0 05 0d 09 01 a1
> > > > 01 85 03 a1 00 06 00 ff 09 01 15 00 26 ff 00 75 08 95 07 81 02 c0 09 02
> > > > 85 03 95 01 b1 02 09 03 85 04 95 01 b1 02 09 04 85 05 95 01 b1 02 09 05
> > > > 85 06 95 01 b1 02 09 06 85 07 95 01 b1 02 09 07 85 08 95 01 b1 02 09 08
> > > > 85 09 95 01 b1 02 c0

> The attribute 0x0206 contains the report descriptor with id 0x22. This
> descriptor defines the actual reports send from/to the device. This is
> nothing SDP specific. It is pure HID, but Bluetooth holds this data in
> the SDP database.

I'm trying to follow the spec up to this point, but don't expect
anything before christmas... <-:

> > > You wrote something about a switch. Is there a difference in the SDP
> > > records if you choose a different setting?
> > 
> > I think I was talking about the two modes mentioned above. As hardware
> > there are only buttons: two "mouse buttons", a power button and a
> > "pairing" button.
> 
> What does the pairing button do? It makes the device discoverable and
> pairable, right?

I think so. It is already a "long time" ago, because some things did
work with the pairing auth/enc switched on, but it did not end up
working (to the level it does without)...


Robert


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