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Re: [tinydtls-dev] Feedback trying to use tinyDTLS with Contiki 2.7
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Hi everyone,
I'm thinking of trying to integrate tinydtls as close as possible to
contiki.
For this I would like to use it without running autoreconf ./configure
options.
Just clone it in "contiki/apps/tinydtls" and start using it (maybe even
as a submodule in the official repository ?).
When compiling with contiki, a "CONTIKI" flag is defined, which could be
used to detect contiki mode automatically and set "WITH_CONTIKI" for the
sources files.
When packaging tinydtls in contiki, I also needed an option to run
./configure --without-ecc or --without-psk.
So this configuration could be let on contiki build system responsability.
For this, I would make tinydtls.h static, remove the ECC/PSK define in
there, and include either a dtls_config_contiki.h or the generated
dtls_config.h.
By doing this, I would only loose the generated PACKAGE_ variables in
Contiki.
These PACKAGE_ variable could be manually set in dtls_config_contiki.h,
or just enclose the debug functions using them with #ifdef.
This depends if the maintainer wants to update both autoconf and header
file values, or if the VERSION variable are not that important for
contiki mode.
In the dtls_config_contiki.h, there would be "TINYDTLS_CONF_WITH_ECC"
variables to overwrite WITH_ECC, and include the platform-specific stuff.
From what I see, the dls_config_contiki.h would even only be
platform-specific/platform.h with new variables because CONF variables
should be after '#include "contiki.h"'.
What do you think of this and the way of doing it ?
I will do a proposal on Gerrit when I have something done.
Regards,
Gaëtan
On 12/05/2016 02:32 PM, Gaëtan Harter wrote:
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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