[Ovmsdev] GPS / NMEA integration

Michael Balzer dexter at expeedo.de
Sun Dec 10 06:46:45 HKT 2017

I'm currently working on the NMEA module. The MUX channel is working, but I don't get a GPS fix.

I've tried all GPS commands and now suspect my SIMCOM module having a hardware issue.

I'm doing this:

OVMS > level debug
OVMS > power simcom on

…wait for the MUX to be ready, then issue…

OVMS > simcom muxtx 4 AT+CGPSNMEA=1
OVMS > simcom muxtx 4 AT+CGPS=1,1

…now the SIMCOM begins sending NMEA $GPGGA lines once per second looking like this:

D (2937174) SIMCOM rx: f9 05 ff 35 24 47 50 47 47 41 2c 2c 2c 2c 2c 2c ...5*$GPGGA,,,,,,*
D (2937174) SIMCOM rx: 30 2c 2c 2c 2c 2c 2c 2c 2c 2a 36 36 0d 0a 60 f9 *0,,,,,,,,*66*..`.

Normally the modem should get a GPS fix within about 1-2 minutes and begin filling data in the $GPGGA record.

But my modem won't, it just keeps sending empty fields.

Can someone please try this with his/her module?

To disable the GPS receiver, issue:

OVMS > simcom muxtx 4 AT+CGPS=0

Thanks & regards,

Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26

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