MC8705 GPS mikrotik

IoT Modules MC/EM Series
14

I think the first thing to do is see if GPS is enabled;
at!custom?

!CUSTOM:

        PUKPRMPT            0x01

        MEPCODE             0x01

        ISVOICEN            0x02

        PRLREGION           0x01

        PCSCDISABLE         0x03

        GPSENABLE           0x01

OK

I have tried the oneXtra commands and I can get the assistance data that’s not a problem its getting the unit to use it that I can’t work out.

I have found some info out by looking at the settings for the GPSPOSMODE.

When I queried it stated that it had the bitmask of 0x01 which is standalone only.

I have now updated the bitmask to 0x79 which should give the following modes;

Bit 0: Standalone

Bit 3: CP MS-based (2G)

Bit 4: CP MS-assisted (2G)

Bit 5: CP UE-based (3G)

Bit 6: CP UE-assisted (3G)

I then performed a !RESET and tried the assisted fix command again;

simple_com /dev/ttyUSB3 AT!GPSFIX=3,180,50

AT!GPSFIX=3,180,50

OK

At least it accepted it this time. So the mask is what was causing the error 23 to be generated.

I have made sure that I have the correct SUPL server entered as well for tmobile;

I have also found that you cannot download the XTRA info when you are trying to do a fix. It fails with error 7. You have to be in a dormant state to download.

simple_com /dev/ttyUSB3 AT!GPSXTRAINITDNLD

AT!GPSXTRAINITDNLD

Xtra command sent successfully
OK

simple_com /dev/ttyUSB3 At!gpsxtrastatus?

At!gpsxtrastatus?
Xtra Time status = Unknown
Xtra Data status = Valid

Validity Start = 2013 11 06 2 21:00:00
Validity End   = 2013 11 13 2 21:00:00

OK

But still can’t get a mode 3 to work with the fix, it fails immediately;

simple_com /dev/ttyUSB3 AT!GPSFIX=3,180,50

AT!GPSFIX=3,180,50
OK

simple_com /dev/ttyUSB3 AT!GPSSTATUS?

AT!GPSSTATUS?

Current time: 1980 01 06 6 00:14:43

1980 01 06 6 00:14:42 Last Fix Status = FAIL, FAILCODE = 15
1980 01 06 6 00:14:42 Fix Session Status = FAIL, FAILCODE = 15

No TTFF available
OK

Mode 2 at least tries and then reverts to standalone;

simple_com /dev/ttyUSB3 AT!GPSFIX=2,180,50

AT!GPSFIX=2,180,50
OK

simple_com /dev/ttyUSB3 AT!GPSSTATUS?

AT!GPSSTATUS?

Current time: 1980 01 06 6 00:14:56

1980 01 06 6 00:14:42 Last Fix Status = FAIL, FAILCODE = 15
1980 01 06 6 00:14:54 Fix Session Status = ACTIVE

No TTFF available
OK

For your info the software version I am using is;

AT+GMR

T3_5_2_1AP R517 CNSZXD00000128 2012/02/07 13:03:25
OK

Kind Regards

Marc