gps: Support multiconstellation NMEA

[Mixaill]

Description

Add support for correct handling of NMEA sentences with different talker IDs, such as $GN, $GL, $GA, or $GB.

Some third-party GNSS+OCXO / GPSDO are based on u-blox modules, and without changes, time synchronization is broken and the following warnings are generated:

[WARNING] [GPS] Unexpected GPSDO string: $GNVTG,,,,,,,,,N*2E
[WARNING] [GPS] Unexpected GPSDO string: $GNGGA,174855.50,,,,,0,00,99.99,,,,,,*77
[WARNING] [GPS] Unexpected GPSDO string: $GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,1*33
[WARNING] [GPS] Unexpected GPSDO string: $GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,3*31
[WARNING] [GPS] Unexpected GPSDO string: $GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,4*36
[WARNING] [GPS] Unexpected GPSDO string: $GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,5*37
[WARNING] [GPS] Unexpected GPSDO string: $GPGSV,1,1,01,07,,,24,1*64
[WARNING] [GPS] Unexpected GPSDO string: $GAGSV,1,1,00,0*74
[WARNING] [GPS] Unexpected GPSDO string: $GBGSV,1,1,00,0*77
[WARNING] [GPS] Unexpected GPSDO string: $GQGSV,1,1,00,0*64

Which devices/areas does this affect?

• libuhd
• devices with GPSDO module support

Testing Done

• added host/tests/gps_ctrl_test.cpp
• tested with USRP B210 with 3rdparty GNSS + OCXO module.

Checklist

• I have read the CONTRIBUTING document.
• My code follows the code style of this project. See CODING.md.
• I have updated the documentation accordingly.
• I have added tests to cover my changes, and all previous tests pass.
• I have checked all compat numbers if they need updating (FPGA compat, MPM compat, noc_shell, specific RFNoC block, ...)

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[Mixaill]

I have read the CLA Document and I hereby sign the CLA

[mbr0wn]

This is a big change, will take time to review. It's not high on our priority. How did you try this? Did you put a third-party GPSDO into a B210 or X310?

[Mixaill]

Did you put a third-party GPSDO into a B210 or X310?

Yes, I installed a third-party GPSDO receiver (based on u-blox m10) into the B210.