Agopengps not getting gps data

Hi, I have another gps receiver I wanted to try (LEA-4T) but I’ve spent hours trying to get aogps to understand it, NMEA data comes through in ublox and aogps’ built in serial monitor, I’ve tried all baud rates/all refresh rates but nothing, it connects fine but gets no NMEA data, I’m logging the required sentences gga and vtg, it’s like it’s not getting anything from the gps, all the text fields are empty, is it using the wrong NMEA version or something?? Thanks