[riot-devel] TCP on RIOT OS

Simon Brummer simon.brummer at posteo.de
Tue May 22 14:35:12 CEST 2018

Hi Theresa,

Martine is right, link local adresses don't currently work with gnrc tcp 
(even with the mandatory interface specifier).
This is a known issue, I am currently working on it. I intend to merge 
it on the next Hack'n'Ack (next Tuesday).

If you need it faster, there is a development branch for the fix on 
It should compile and work however, it could have some undesired side 

Kind regards


Am 2018-05-22 14:03 schrieb Martine Lenders:
> Hi Theresa,
> were you using link local addresses (i.e. are they prefixed
> `fe80::/64`) for your trials? If yes, newer versions require to also
> provide an interface with that (as it is the case e.g. also on Linux)
> so this might be your problem. The client and server needs to be fixed
> then of course to have the interface provided or warn the user that it
> is missing..
> Best regards,
> Martine
> 2018-05-22 9:37 GMT+02:00 "Theresa Müller" <theresa2596 at web.de>:
>> Hi everyone,
>> I am currently trying to use TCP on RIOT, but I'm having problems
>> with it, since the "gnrc_tcp_server" and "gnrc_tcp_client" tests are
>> not working on the latest version of RIOT. I tried to run these
>> tests on the 2017.01 release where they were added the first time
>> and everything works fine here, but when I run them on the 2018.01
>> or 2018.04 release, wireshark doesn't show any TCP pakets and the
>> client always receives a timeout after a while, so somehow the
>> client and the server aren't able to establish a connection. Maybe
>> one of you knows what caused this change in behaviour and how this
>> could be fixed.
>> Thanks a lot for your help!
>> Best regards,
>> Theresa
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>> devel at riot-os.org
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