Using gpsfake with MP for SITL follow me testing

hello every one
I’m trying to simulate a follow me mission on my desktop
SITL is working ok
and I try to use a gpsfake publishing to a gpsd PTY a NMEA stream as reference for GroundStation position
unfortunatley I can’t figurout how to link PTY of gpsfake stream to a TTY readable by Mission Planner
does any body already try somthing similar ?
thank’s for any idea