Re: [Bluez-users] L2CAP MTU and packet fragmentation?

[Marcel Holtmann <marcel@holtmann.org>]

Hi Stephen,

> Forgive me if this has been answered time and again, but I can't seem to
> access the archives just now. Google's not helping me much either.
> 
> I have a bit of BlueZ code, which I have to make use of L2CAP sockets to
> communicate between devices. I've seen that I can alter the MTU for
> packets, but I'm surprised that packets don't get fragmented as per
> plain UDP when a packet larger than the MTU is passed to send().
> 
> Have I missed a configuration option somewhere?

the L2CAP socket is a SOCK_SEQPACKET and you have to honor that MTU. It
is not a stream or a connection-less socket.

> I could live with the MTU being 64k with no fragmentation, but I seem to
> get quite a lot of corrupt packets over around 2kB.

I have no idea what you are talking about. The L2CAP layer is reliable
and the underlaying ACL link, too.

Regards

Marcel



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