@drvic I'm using a smple uart to SPort converter as in the figure
from the guidelines here.
Up to know I've checked whether the messages are flowing to SPort of my X8R FrSky module and we see everything is ok.
I'm going to implement a simple HUD to check main parameters using this script.
More details on FrSky telemetry on ardupilot wiki (here)
I've not checked but I think it is possible to use as well the C&T FlightDeck.