[zeromq-dev] ZeroMQ for Contiki OS

[Pieter Hintjens]

Oh, and I sent you your first pull request. :)

On Wed, Jan 20, 2016 at 12:39 PM, Pieter Hintjens <ph at imatix.com> wrote:
> Hi Axel,
>
> This is really cool... could be the basis for other embedded projects.
> I'd like to move this into the zeromq organization and use our C4.1
> contribution policy, is that OK?
>
> The name suggests you ported libzmq, which is misleading. It'd be
> better to say "ZMTP" instead of "ZeroMQ".
>
> I've invited you to the ZeroMQ core team so you can move this project
> (if you approve of this idea).
>
> -Pieter
>
>
> On Wed, Jan 20, 2016 at 11:47 AM, Axel Voitier <axel.voitier at gmail.com> wrote:
>> Yes, I actually started from libzmtp. Few things remain from it now
>> (channels and msgs) as I had to adapt it to whatever Contiki provides.
>> Contiki does not have a posix socket interface. But the hardest was t adapt
>> to its threading model (protothreads) which were really constraining...
>>
>> Also, I adapted the memory allocations to do use as much as possible
>> preallocation (called memb in Contiki). A few malloc remains here and there,
>> but much less than initially.
>>
>>
>> However, if I was to restart this project, I would not pick Contiki anymore.
>> But rather give it a try with RIOT, which seems to have something that match
>> a POSIX interface. And a much saner threading model that behaves a bit like
>> an event loop with a hub (and reusing features from the underlying MCU to do
>> context switching, like the SVC instruction with ARM).
>>
>>
>> Cheers,
>> Axel
>>
>> --
>> Contact: axel.voitier at gmail.com
>> Secure: axel.voitier at protonmail.ch
>>
>> 2016-01-20 9:31 GMT+01:00 Benjamin Henrion <zoobab at gmail.com>:
>>>
>>> On Wed, Jan 20, 2016 at 4:01 AM, Axel Voitier <axel.voitier at gmail.com>
>>> wrote:
>>> > Hello,
>>> >
>>> > I have published an attempt at porting zeromq to Contiki OS:
>>> > https://github.com/Alidron/contiki-zeromq
>>> >
>>> > It has a few limitations still. However, I covered most basics of ZMTP
>>> > and a
>>> > handful of sockets. It is not entirely compliant with the RFCs for the
>>> > moment though (some parts prove to be harder to do than I expected).
>>> >
>>> > I have been able to run it on a constrained setup: ARM Cortext M3
>>> > running at
>>> > 32MHz, with 512KB of flash (the demo programs weight about 130KB) and
>>> > 80KB
>>> > of RAM. And with a sub-1GHz RF link.
>>> >
>>> > The implementation makes use of Contiki network stack, which can use
>>> > TCP,
>>> > IPv4, IPv6 and 6LoWPAN. I actually tested it over 6LoWPAN on the sub-GHz
>>> > link :).
>>> >
>>> > It is not has featured and fast as running zeromq between two usual
>>> > computers. But I hope this implementation prove it is feasible to have
>>> > ZeroMQ on such constrained hardware :).
>>>
>>> Have you tried to compile libzmtp?
>>>
>>> One of my short-term goal is to make libzmptp running on esp8266 and
>>> some cortex m3 board.
>>>
>>> --
>>> Benjamin Henrion <bhenrion at ffii.org>
>>> FFII Brussels - +32-484-566109 - +32-2-3500762
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>>
>>
>>
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