Re: [tinydtls-dev] Feedback trying to use tinyDTLS with Contiki 2.7

[Gaëtan Harter <gaetan.harter@xxxxxxxx>]

Hi Laurent,

I'm glad to here that.

It would crash if a message had trouble being delivered and was in fact 
retransmitted by 'dtls_retransmit_process'.
By "luck" my border router was mis-configured and not routing big 
packets, so the crash was reproducible which helped narrow down the issue.

Regards,
Gaëtan

On 12/06/2016 02:51 PM, Laurent Deru wrote:
> Hi,
>
> Your second fix solves a unexplained random crash we had since a long 
> time, now all the dtls connections seem stable !
>
> Kind regards,
> Laurent.
>
> Le 5/12/16 à 14:32, Gaëtan Harter a écrit :
> > Hi all developers,
> >
> > I posted the changes I did on gerrit one commit at a time.
> >
> > The most important changes are I think:
> >
> > * The fix for "peer.h" https://git.eclipse.org/r/86360
> > * The fix for contiki "dtls_retransmit_process" 
> > https://git.eclipse.org/r/86351
> >
> > These are real issues that makes the code crash without knowing why.
> > The others are easily fixable when using tinydtls in your application 
> > but prevent it to work out of the box without warning.
> >
> >
> > Please give me feedback on these changes.
> > I can rebase any moment if needed.
> >
> > Regards,
> > Gaëtan Harter
> >
> > On 12/01/2016 04:45 PM, Gaëtan Harter wrote:
> > > Hi Raul, developers,
> > > On 11/29/2016 04:13 PM, Raul Fuentes wrote:
> > > > Hi Gaëtan,
> > > >
> > > >     Now after some time, the client and server get stuck I will try to
> > > >     see why.
> > > >
> > > >
> > > >  I have noticed this also with my implementation over RIOT. There 
> > > > is a point where the server is unable to accept new DTLS sessions 
> > > > (around the sixth time a node tries to establish a DTLS session 
> > > > with PSK). My theory is that the DTLS session are not cleaning 
> > > > properly the memory released from previous DTLS sessions.
> > >
> > > For the "getting stuck" status, it was that the first ClientHello 
> > > was received by the server but not the second.
> > > The second is a bit bigger than the first one and it was a size limit.
> > > It was only a problem of my border-router UIP_CONF_BUFFER_SIZE that 
> > > was not set and so was not big enough.
> > > Setting it to 1500 fixed everything.
> > >
> > >
> > > Communication with both PSK and ECC is now working with one client 
> > > and one server.
> > > However with ECC, connection is really slow on our hardware so maybe 
> > > not really usable in practice.
> > >
> > > I did not tested long time usage for the moment however.
> > >
> > >
> > > For the problems of include I mentioned before, I choose to include 
> > > dtls_config.h in tinydtls.h and include tinydtls.h in almost all 
> > > headers.
> > >
> > > Now it's both working with utash and without.
> > >
> > >
> > > I will give more feedback if I find new issues or have good news 
> > > while using it more.
> > >
> > >
> > > Regards,
> > > Gaëtan Harter
> > > > Sincerely, Raul Fuentes
> > > >
> > > >
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