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

[Gaëtan Harter <gaetan.harter@xxxxxxxx>]

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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