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Re: [gpsd-dev] gpsd - AT command control on modems

From: Gary E. Miller
Subject: Re: [gpsd-dev] gpsd - AT command control on modems
Date: Fri, 5 Jul 2019 11:23:04 -0700

Yo Luca!

On Thu, 04 Jul 2019 19:36:04 +0200
Luca Weiss <address@hidden> wrote:

> I was testing gpsd on the Pinephone devkit [1] with the Quectel
> EC25-E modem which also has GPS/GNSS integrated.


> I could start gpsd
> fine with "sudo gpsd -N -D3 -G -F /var/run/gpsd.sock /dev/ttyUSB1"

Dunno why you would use the socket AND specify the device.

> but afterwards I needed to tell the modem at /dev/ttyUSB2 the command
> "AT+QGPS=1" to turn on the GPS component (and "AT+QGPSEND" to stop it
> again).

Afterwards, not before?  USB2 not USB1?

> So I wanted to ask how I can integrate that into gpsd so it
> does it automatically?

Don't bother,  That would be very hard.  Just do:
        # echo ""AT+QGPSEND" > /dev/ttyUSB2

> I've also seen that ofono provides a "location reporting api"; and
> there's also modemmanager which provides seemingly the same
> functionality;

No idea.  Might be soemthing easy and standard, might be bizarre and

we would need some doc to know.

> but as most existing applications seem to use gpsd
> (except I think anything geoclue based, as that only supports
> modemmanager) I would like to get gpsd working properly for this.

geoclue is also new to me.

Ah, d-bus based.  Is that what gpsd already uses?

> [1]

Interesting.  I for one have come to hate Samsung for their bloatware
and adware.  And now their phones are very fragile.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
    "If you can’t measure it, you can’t improve it." - Lord Kelvin

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