Re: getting GPS with EM7355 to work

[Patrick Conroy]

some brief info here on getting a ttyUSBx device 

https://forum.sierrawireless.com/t/struggling-to-get-panasonic-toughbook-with-em7355-gps-working-with-ubuntu/27077/12

On Thu, Jul 25, 2024, 2:42 PM Gary E. Miller <gem@rellim.com> wrote:

Yo Marco!

On Thu, 25 Jul 2024 15:56:10 +0200
Marco Moock <mm@dorfdsl.de> wrote:

> I have a Sierra Wireless EM7355 (branded HP LT4111) in the ZBook 15

Sorry to hear that.  The combined LTE/GPS solutions all all unique and weird.

> and I am new to the GPS stuff on Linux.

Strap in for a ride.

> m@zbook:~$ mmcli -m 0 --location-status

First I have heard of ModemManager talking to a GPS.  I guess that is
progress.

> m@zbook:~$ mmcli -m 0 --location-get
>   -----------
>   GPS | nmea: $GPGSA,A,1,,,,,,,,,,,,,,,*1E
>       |       $GNGNS,,,,,,NN,,,,,,*53

Not good at all.  You have no fix at all.  Does it work outside?
Is it in some sleep mode?


>       |       $GNGSA,A,1,,,,,,,,,,,,,,,*00
>       |       $PQXFI,,,,,,,,,,*56
>       |       $GPVTG,,T,,M,,N,,K,N*2C
>       |       $GPGGA,,,,,,0,,,,,,,,*66
>       |       $GPRMC,,V,,,,,,,,,,N*53
> m@zbook:~$
>
> Is that already enough to make GPS with gpsd work?

Nope.  You have no fix at all.  Does it work outside?

> How can I make the modem create they tty device that will be used by
> gpsd?

Your guess is as good as mine.  I guess you could pipe that mmcli output to a
program to remove the formatting and return it to NMEA, but you still need
to get a fix.

RGDS
GARY
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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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