Cube Orange Arducopter 4.6.3 ready to go to 4.7.1.
Raspberry pi5 on telem1 and a jetson on telem2. Original RF design FTDI cables connected from the RPi to telem1 and Jetson to Telem2, if i set BRD_SERx_RTSCTS to 1 nothing works, if i set to 2 (auto) works fine. I have checked cables multiple times and always the same. for the fun of it i connected an RFD868 (non EU) and tested the same and again no telemetry, as soon as turn it off or set to Auto, it all works.
I am sure i am doing something wrong but my cables are not crossed and i have made sure ubuntu on both devices have RTSCTS enabled.