I use FrSky telemetry with a X8R receiver and a Taranis QX7S radio. The FC is a Pixracer R15 fro mRobotics. I have it working also for a R-XSR receiver and a Chinese clone Pixracer R14.
Having the info available on the receiver without needing any additional hardware and software is a great feature I can recommend. For some info see this link : https://docs.px4.io/en/peripherals/frsky_telemetry.html
Referring to the info in above linked docs there are a couple of issues I have not been able to resolve. The 0420 item (distance to home) does not show up under PX4. For the “Fuel” item I can get the percentage but have found no way to display the mAh drawn mentioned in the docs.
I can add that for different installation (a F3 controller, INAV and one R-XSR) both the 0420 and mAH drawn is working.
Has anybody come across the missing 0420 labeled distance and the current drawn and if so have you found a solution? Searcing the various forums and docs I have not found any info for this question.
Maybe I should add that other items are immediately discovered by the QX7S and work great so to me this appears to be an issue with the PX4/QGroundcontrol implementation of this function.