Reg Adding GPS NMEA & GPS RAW Capabilities to get GPS location using mmcli

[Ramu]

Hi Aleksander,

Thanks for the explanation.. Will try for GPGGA with antenna ...

1. Able to display nmea traces with *gps-nmea ..*

mmcli -m 0 --location-status
  ------------------------
  Location | capabilities: 3gpp-lac-ci, gps-raw, gps-nmea, gps-unmanaged
           |      enabled: 3gpp-lac-ci, gps-raw, gps-nmea
           |      signals: no
  ------------------------
  GPS      | refresh rate: 30 seconds

root at tcs-imx6:~# mmcli -m 0 --location-get
  --------------------------
  3GPP |      operator code: 404
       |      operator name: 49
       | location area code: 0000
       | tracking area code: C4E3
       |            cell id: 0DE0010B
  --------------------------
  GPS  |               nmea: $GPGSA,A,1,,,,,,,,,,,,,,,,*32
       |                     $GPRMC,,V,,,,,,,,,,N,V*29
       |                     $GPGLL,,,,,,V,N*64
       |                     $GPVTG,,T,,M,,N,,K,N*2C
       |                     $GPGGA,,,,,,0,,,,,,,,*66

2.   For *gps-unmanaged *
mmcli -m 0 --location-status
  ------------------------
  Location | capabilities: 3gpp-lac-ci, gps-raw, gps-nmea, gps-unmanaged
           |      enabled: 3gpp-lac-ci, gps-unmanaged
           |      signals: no
  ------------------------
  GPS      | refresh rate: 30 seconds
root at tcs-imx6:~# mmcli -m 0 --location-get
  --------------------------
  3GPP |      operator code: 404
       |      operator name: 49
       | location area code: 0000
       | tracking area code: C4E3
       |            cell id: 0DE0010B

3. *For gps-raw : *
mmcli -m 0 --location-status
  ------------------------
  Location | capabilities: 3gpp-lac-ci, gps-raw, gps-nmea, gps-unmanaged
           |      enabled: 3gpp-lac-ci, gps-raw
           |      signals: no
  ------------------------
  GPS      | refresh rate: 30 seconds
root at tcs-imx6:~# mmcli -m 0 --location-get
  --------------------------
  3GPP |      operator code: 404
       |      operator name: 49
       | location area code: 0000
       | tracking area code: C4E3
       |            cell id: 0DE0010B

Regards
Ramu

On Mon, Jun 22, 2020 at 1:06 PM Aleksander Morgado <aleksander at aleksander.es>
wrote:

> Hey
>
> On Sat, Jun 20, 2020 at 3:39 PM Ramu <ramumr06 at gmail.com> wrote:
> >
> > I applied patches you mentioned for UDEV tags ... Seems to be working
> now..
> >
> > mmcli -m 0 --location-status
> >   ------------------------
> >   Location | capabilities: 3gpp-lac-ci, gps-raw, gps-nmea, gps-unmanaged
> >            |      enabled: 3gpp-lac-ci
> >            |      signals: no
> >   ------------------------
> >   GPS      | refresh rate: 30 seconds
> >
>
> Good!
>
> > ### Enabling GPS working fine ###
> >
> > root at tcs-imx6:~# mmcli -m 0 --location-enable-gps-nmea
> > successfully setup location gathering
> > root at tcs-imx6:~# mmcli -m 0 --location-enable-gps-raw
> > successfully setup location gathering
> > root at tcs-imx6:~#
> >
>
> Ok.
>
> > ### Do we need get any location Data here ??? ####
> > root at tcs-imx6:~# mmcli -m 0 --location-get-gps-raw
> > error: no actions specified
> > root at tcs-imx6:~# mmcli -m 0 --location-get-gps-nmea
> > error: no actions specified
> >
>
> The command you're looking for is --location-get.
>
> > But the GPS data is comign on the ttyUSB1 port .. I have not connected
> any passive or active antenna for GPS as of now.. But seeing below data ...
> >
> > cat /dev/ttyUSB1
>
> If you are using --location-enable-gps-nmea or
> --location-enable-gps-raw you CANNOT touch the ttyUSB1 manually. You
> cannot "cat" it or any other thing, because you would be hijacking the
> data from ModemManager. If you need to cat or touch the ttyUSB1
> manually, you instead need to --location-enable-gps-unmanaged, so that
> MM takes care of starting the GPS engine, but then ignores the tty
> with the GPS data.
>
> > $GPVTG,,T,,M,,N,,K,N*2C
> > $GPGSA,A,1,,,,,,,,,,,,,,,,*32
> > $GPGGA,,,,,,0,,,,,,,,*66
> > $GPRMC,,V,,,,,,,,,,N,V*29
> > $GPGLL,,,,,,V,N*64
> > $GPVTG,,T,,M,,N,,K,N*2C
> > $GPGSA,A,1,,,,,,,,,,,,,,,,*32
> > $GPGGA,,,,,,0,,,,,,,,*66
> > $GPRMC,,V,,,,,,,,,,N,V*29
> > $GPGLL,,,,,,V,N*64
> > $GPVTG,,T,,M,,N,,K,N*2C
> > $GPGSA,A,1,,,,,,,,,,,,,,,,*32
> > $GPGGA,,,,,,0,,,,,,,,*66
> > $GPRMC,,V,,,,,,,,,,N,V*29
> > $GPGLL,,,,,,V,N*64
> >
>
> Given that your GPGGA trace doesn't give any location yet, the output
> of --location-get will not give you lat/long info, but it will still
> give you the list of NMEA traces received and read by ModemManager (as
> long as you don't hijack the tty as said above).
>
> Cheers!
>
> --
> Aleksander
> https://aleksander.es
>
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