Re: Broadcast nmea to the network

[Patrick Conroy]

with MQTT, and most other message brokers, you have Quality of Service options you can set to ensure clients receive a message.

I've used MQTT in machine control production systems and found the latency to be extremely low.  Mosquitto is a fast MQTT broker.

I've switched over to an event driven, message based architecture in about all of my code.

if i had to route NMEA messages around I'd explore gpspipe first.  if insufficient, then I'd explore MQTT 

On Mon, Mar 18, 2024, 9:03 AM Andreas B <panden@gmail.com> wrote:

Владимир, Gary, Nick, Chris, Bo, Patrick,

Thank you so much for your answers.  Hope it's okay I respond to you all in
this email.

The reason why I want to test this (it's all for fun), is that I've seen it
done on vessels (ships, acquiring e.g. echosounder data).  Instead of clients
connecting to a server, the device responsible for location data (i.e.
GPS/GNSS) will send datagrams (containing NMEA sentences) to the network
broadcast address.  In my naive case, rogue devices spraying bogus data do not
exist.

To me this seems simple and efficient: if you care about the data, all you have
to do is listen. A downside is of course that you're, well, broadcasting data
to the whole network.

Mosquitto/MQTT looks interesting.

Best regards,
Andreas

On Wed, Mar 13, 2024 at 6:45 PM Gary E. Miller <gem@rellim.com> wrote:
>
> Yo Andreas!
>
> On Wed, 13 Mar 2024 12:31:47 +0100
> Andreas B <panden@gmail.com> wrote:
>
> > Not strictly a gpsd question, but with all the competence here, I just
> > have to give it a shot.
>
> Close enough.
>
> > What's the best way of broadcasting nmea (or other data) to the
> > network? Can gpsd do this, or do you use netcat/socat?
>
> gpsd serves TCP lcients, so not broadcast.  I'd give netcat a try.
>
> Any reason not to use TCP?
>
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
>         gem@rellim.com  Tel:+1 541 382 8588
>
>             Veritas liberabit vos. -- Quid est veritas?
>     "If you can't measure it, you can't improve it." - Lord Kelvin