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NeoGPS support for u-blox GPS devices

To use either ublox-specific NMEA messages ($PUBX) or the UBX binary protocol, you must enable the following in NMEAGPS_cfg.h:

#define NMEAGPS_PARSE_MFR_ID

#define NMEAGPS_DERIVED_TYPES

ublox-specific NMEA messages

NeoGPS implements the following additional NMEA messages:

NMEA 0183 Proprietary Messages

UBX,00 - Lat/Long Position Data
UBX,04 - Time of Day and Clock Information

You may want to change the configured PUBX messages in PUBX_cfg.h. It is currently configured to work with the example application, PUBX.ino. PUBX_cfg.h has the following configuration items:

#define NMEAGPS_PARSE_PUBX_00
#define NMEAGPS_PARSE_PUBX_04

ublox-specific binary protocol

NeoGPS implements the following messages in the UBX binary protocol:

UBX Protocol Messages

Message	Description	NEO series
NAV_STATUS	Receiver Navigation Status	6
NAV_TIMEGPS	GPS Time Solution	6
NAV_TIMEUTC	UTC Time Solution	6
NAV_POSLLH	Geodetic Position Solution	6
NAV_DOP	Dilutions of precision	6
NAV_PVT	Navigation Position Velocity Time Solution	7
NAV_VELNED	Velocity Solution in NED (North/East/Down)	6
NAV_SVINFO	Space Vehicle Information	6
HNR_PVT	High Rate Output of PVT Solution	8

You may want to change the configured UBX messages in ubx_cfg.h. It is currently configured to work with the example application ublox.ino.

The configuration file ubx_cfg.h has the following configuration items near the top of the file:

#define UBLOX_PARSE_STATUS
#define UBLOX_PARSE_TIMEGPS
#define UBLOX_PARSE_TIMEUTC
#define UBLOX_PARSE_POSLLH
//#define UBLOX_PARSE_DOP
#define UBLOX_PARSE_VELNED
//#define UBLOX_PARSE_PVT
#define UBLOX_PARSE_SVINFO
//#define UBLOX_PARSE_HNR_PVT

Note: Disabling some of the UBX messages may prevent the ublox.ino example sketch from working. That sketch goes through a process of first acquiring the current GPS leap seconds and UTC time so that "time-of-week" milliseconds can be converted to a UTC time.

The POSLLH and VELNED messages use a Time-Of-Week timestamp. Without the TIMEGPS and TIMEUTC messages, that TOW timestamp cannot be converted to a UTC time.

If your application does not need the UTC date and/or time, you could disable the TIMEGPS and TIMEUTC messages.
If your application does not need latitude, longitude or altitude, you could disable the POSLLH message.
If your application does not need speed or heading, you could disable the VELNED message.
If your application does not need satellite information, you could disable the SVINFO message.

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