Has Light Weight Telemetry (LTM) support been added?

Hi Has LTM support been added to any of the firmware? https://ardupilot.org/copter/docs/common-ltm-telemetry.html

I don’t see serial option 25 on either copter or plane firmware (omnibus F4) v4.0.6

Thank you!

Probably it has only been added to github master branch.

Thank you. I was able to build a firmware with LTM…