Re: [Bluez-users] hcidump and l2cap questions

[Sean Loh <blaze_wk@yahoo.com>]

Hi again Marcel,

Thanks for the quick response!!!!

1. Does that mean that bluez constantly fragments all
upperlayer protocols to a max of 1500 bytes?

2. What does the parameters of these hcidump mean?
1098027478.336048 < BNEP: Compressed(0x02|0)
    [proto 0x0800]

As usual thanks a lot..!!!!


--- Marcel Holtmann <marcel@holtmann.org> wrote:

> Hi Sean,
> 
> > I'm streaming audio from one computer to another
> > computer  using the pan profile.
> > 
> > 1. I would like to see bnep packets being filtered
> > through hcidump. But when i put the bnep filter
> on,
> > hcidump does not print out anything. It only seems
> to
> > print out acl and l2cap data. Why is that? How am
> I
> > able to see bnep packet info?
> 
> simply call "hcidump -x" and be happy. However if
> you miss the initial
> l2cap_connect_req the dynamic channel assignment
> don't works.
> 
> > 2. I notice that even if i send udp packets that
> have
> > 55000 bytes. The maximum packet length that turns
> up
> > on hcidump is 1500 bytes. Shouldn't it be 55000
> bytes
> > because the max mtu for an l2cap packet is 65535
> > bytes?
> 
> The L2CAP uses segmentation and we use a MTU of
> 1691. Start thinking a
> little bit about the Ethernet frame size and so on.
> 
> Regards
> 
> Marcel
> 
> 
> 



		
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