This repository contains user-space gps drivers, used as a submodule in PX4 Firmware and QGroundControl.
All platform-specific stuff is done via a callback function and a
definitions.h header file.
In order for the project to build, definitions.h must include definitions for sensor_gnss_relative_s, sensor_gps_s and satellite_info_s.
For example, check the implementation in PX4 Autopilot or QGroundControl.