Re: [TF-DI] using mDNS for discovering gateways

Hi Dave,

We are developing gateway and devices implementation based on mDNS (Avahi),
MQTT (Mosquitto) and ESB (Apache Service Mix).

- devices and gateways can be discovered by using mDNS
- once discovered, devices are automatically configured
- then devices are registered on the gateways as a REST service (ESB), also
automatically
- an the end, web applications can communicate with gateways by RESTful
services and gateways can communicate with its devices by using MQTT

best regards,

-- 
Cássio Prazeres
---------------------------------------------------------------------------
Computer Science PhD
Professor Adjunto III - Universidade Federal da Bahia
WISER: Web and Interactive Systems Research Group
Area: Hypermedia/Semantic Web/Web Services
Site: http://www.dcc.ufba.br/~prazeres/
Lattes: http://lattes.cnpq.br/5075736089100544


On Fri, Apr 1, 2016 at 8:03 AM, Dave Raggett <dsr@w3.org> wrote:

> I’ve implemented a small mDNS client as a means for my C++ based web of
> things server for microcontrollers to discover a gateway, and wonder if
> anyone else has been exploring this approach and would care to swap notes?
>
> This is aimed at IoT devices with IP connectivity. When the device starts
> up, it uses DHCP to set up the network parameters and then uses mDNS to
> discover the gateway.  The device then registers its “things” as proxies on
> the gateway, which is likely to be a more powerful device, e.g. running
> Linux, such as a Raspberry Pi or Intel Edison.
>
> I am currently using the dns-sd command line tool to register the gateway
> as a discoverable service. However, OS X is setting the time to live to
> only 120 seconds for the DNS “A” records that declare the IPv4 address for
> a service. OS X stops responding to mDNS queries once this time has
> expired.  I guess, that I will need to look at the Bonjour library as a way
> to extend the time to live.
>
> —
>    Dave Raggett <dsr@w3.org>
>
>
>
>