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Originally https://www.immersionrc.com/fpv-products/tramp-hv-5-8ghz-video-transmitter/ was one of first video transmitters with serial protocol to control power via telemetry.Nowadays RunCam TX200 and many other video transmitters support this convention.
How this is implemented in other firmware, can be found here https://github.com/betaflight/betaflight/wiki/IRC-Tramp
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Originally https://www.immersionrc.com/fpv-products/tramp-hv-5-8ghz-video-transmitter/ was one of first video transmitters with serial protocol to control power via telemetry.
Nowadays RunCam TX200 and many other video transmitters support this convention.
How this is implemented in other firmware, can be found here https://github.com/betaflight/betaflight/wiki/IRC-Tramp