RTCM inject from antenna tracker

[suraqis]

Issue details

Now it seems that no way to inject RTCM messages from GPS RTK enabled base module connected to antenna tracker. It would be handy to receive correction within MAVlink from antenna tracker.

Version

What version was the issue encountered with

Platform

[ ] All [ X ] AntennaTracker [ ] Copter [ ] Plane [ ] Rover [ ] Submarine

Airframe type

What type of airframe (flying wing, glider, hex, Y6, octa etc)

Hardware type

What autopilot hardware was used? (pixhawk, pixracer, PX4FMU etc)

Logs

Please provide a link to any relevant logs that show the issue

[geofrancis]

this would be great, mission planner crashing is a PITA.

[proficnc]

This would be awesome