Re: Question about using GPSd & ubxtool for ADR implmentation

[Gary E. Miller]

Yo Aaron!

On Mon, 6 Dec 2021 18:19:12 +0000
Aaron Wheeler <aaron.wheeler@vontas.com> wrote:

>   We have an application where we want to use the u-blox ADR module
> in ADR mode.

Good luck with that.  ADR mode is a PITA.

> For this application, we want to feed the receiver
> vehicle speed information using the ESF-MEAS message.

I'm confused.  You are sending data TO the receiver?  That is not how
ESF-MEAS works.

> To accomplish
> this, we would need to send a CFG-ESFWT message for configuration,
> followed by a periodic ESF-MEAS message, containing the vehicle
> speed.

That is what the wheel-tick is for.


>  We have investigated ubxtool and its messages for a possible
> solution, but it seems that ubxtool is mostly for enabling output
> messages from receiver.

Sort of.  You can send anything you want to the receiver using ubxtool.
Just a little harder for some things as you have to construct the
binary message.

But, if you are trying to do what I think you are, there is no message
to do that.

> Is there the ability to use ubxtool to send down the CFG-ESFTW &
> ESF-MEAS messages, at rates of at least 10Hz?

ESF-MEAS comes from the receiver.  You can not send data to the
receiver.

Being u-blox, there may be some secret mode that does that, but I 
see nothing about that in their doc.

> In GPSd, I do see the ability to send messages to the GPSd daemon.

gpsctl and ubxtool do that.  Or just code you own client.

> Barring an implementation in ubxtool, is there a GPSd message that
> could be used to send a serial data packet down to a receiver, to
> implement such a design?

gpsctl and ubxtool do that.  Or just code you own client.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        gem@rellim.com  Tel:+1 541 382 8588

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