[zeromq-dev] Zyre ipaddress in Hello message

[Lindley French]

There's another advantage to doing one socket per address---it makes it
easy to pick and choose which interfaces you really want to listen/beacon
on. On a phone, for instance, it might make a lot of sense to beacon on
wlan0 (wifi) and bnep0 (bluetooth), but less sense to beacon on rmnet0
(4G). Alternatively, if you are using a network simulator like CORE or
EMANE, you might need to make sure you *only* beacon over a particular
interface.

How these interfaces are specified is, of course, a difficult problem to
get right. Nonetheless, the ability to be selective is useful.


On Thu, Jan 2, 2014 at 8:51 AM, Pieter Hintjens <ph at imatix.com> wrote:

> On Thu, Jan 2, 2014 at 1:06 PM, Arnaud Loonstra <arnaud at sphaero.org>
> wrote:
>
> > IMHO the easiest way to solve this is to get the ipaddress through the
> > 0mq socket. Pieter you said this was available in 0mq4+. Are there any
> > examples or docs?
>
> It's not yet available at the libzmq API, only internally. I'm not
> happy making the ZRE protocol depend on a specific version of ZeroMQ
> either.
>
> The beacon isn't a problem afaics: it is trivial to get the sender
> address for a beacon and we already do that. I don't see there's any
> requirement for endpoints except tcp:// at the moment. So a beacon
> with port number is fine.
>
> I think we can get the socket interface address for each received
> beacon, and deliver that as a 3rd frame.
>
> -Pieter
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