[riot-users] gcoap and DTLS

Thomas C. Schmidt t.schmidt at haw-hamburg.de
Mon Apr 16 09:43:46 CEST 2018

Hi Cristina,

I cannot help with the IPv4 code fragments, but I wonder why you want to 
use IPv4 on RIOT?

To gain 'transparent' IPv4 connectivity, you can use IPv6-embedded IPv4 
addresses and perform stateless address translation at a gateway.

Would that help?


On 16/04/2018 09:38, Cristina Paniagua wrote:
> Hi,
> Until the date, I've been working with IPv6,gcoap and Mulle devices, but 
> I would like to know if I could send from the device a GET to an 
> IPv4 address.  I read that it's not supported by RIOT, but I found some 
> library IPv4, I tried to use and it's not working.
> someone knows more about the use of IPv4 in RIOT?
> Thank you all, Cristina.
> ------------------------------------------------------------------------
> *De:* users <users-bounces at riot-os.org> en nombre de Ken Bannister 
> <kb2ma at runbox.com>
> *Enviado:* martes, 30 de enero de 2018 16:18:41
> *Para:* users at riot-os.org
> *Asunto:* Re: [riot-users] gcoap and DTLS
> Thanks, Joakim. I have created a similar example, although it's not in 
> the repository examples collection. For anyone interested, check out 
> the, "gcoap presentation" thread on the ML from last October [1]. It 
> references the data collection application as well as a presentation and 
> video I created about it.
> Ken
> [1] https://lists.riot-os.org/pipermail/users/2017-October/thread.html
> On 01/30/2018 02:52 PM, Joakim Nohlgård wrote:
>> I think an example with an observable, periodic resource would be a 
>> useful addition to the example collection. The periodic resource could 
>> be simply sending the xtimer_now value or adc_read or similar 
>> periodically every 5 seconds or something to show how to set up 
>> periodic notifications in gcoap.
>> Without looking at the code I guess it would be driven by xtimer to 
>> provide events to the gcoap observable resource event loop.
>> Best regards, Joakim
>> On Jan 30, 2018 3:21 PM, "Ken Bannister" <kb2ma at runbox.com 
>> <mailto:kb2ma at runbox.com>> wrote:
>>     Hi all,
>>     Recently I received private mail with some specific questions
>>     about gcoap and DTLS. Responses below.
>>     There is a work-in-progress pull request for integration of DTLS
>>     and gcoap, #7177. There is good discussion in there about the best
>>     way to integrate DTLS generically with RIOT's sock networking.
>>     RIOT's master branch includes support for the Observe extension
>>     for non-confirmable messaging. There is an open PR for integration
>>     with confirmable messaging, #7548.
>>     There also was a question about "periodic resources", but that's
>>     not part of the CoAP spec AFAIK. Certainly one could integrate a
>>     timer to periodically send Observe notifications.
>>     Ken
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Prof. Dr. Thomas C. Schmidt
° Hamburg University of Applied Sciences                  Berliner Tor 7 °
° Dept. Informatik, Internet Technologies Group   20099 Hamburg, Germany °
° http://inet.haw-hamburg.de/members/schmidt      Fon: +49-40-42875-8452 °

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