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So, I tested once more without byte-stuffing and (as implied by the remark of Kirah, thank you!) the bytes 7e and 7d do come through either...
Anyway thanks for your comments !

Thanks Mike, indeed the telemetry packet on Fport is NOT "framed into 0x7e... I will try to simply drop the stuffing and report back! Thanks ! (I thought to have seen in the opentx source code that they always try to "unstuff" the s- and f-port telemetry packets... but I might be wron...

I have a Jumper R1F receiver with FPort which I want to use with a RP2040 processor for my RC models. To understand FPort I first hooked up the Fport of my receiver with a double inverter (2 transistors and some resistors) to a serial to USB converter which is plugged into my linux PC. I wrote a sma...

Thank you so much Kilrah, works like charm !!!
And thanks to all who contributed to OpenTX. Fantastic project !!!

Dear experts, I am a new in the world of RC and OpenTX. I built a custom telemetry sensor with an ATTiny controller (FrSky S.PORT protocol) which successfully transfers data on Battery Voltage, driven distance and actual speed of my RC car to my sender (TX16 Radiomaster). I see the telemetry values ...