Antenna tracker change output

Hi dears
I want to build antenna tracker with new kind of motors which are controlled via serial interface.
How can I get serial output from the flight control to control the motors?
Thanks and regards

There are a few ways, the first would be if is a protocol already supported by rover. In that case you could just add the library to tracker. You could write a new library for protocol either in AP natively or in lua scripting.

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Thanks Peter,
How can I get started with AP natively programming?

Check out the dev wiki,

https://ardupilot.org/dev/index.html