Software Serial not usable on Omnibus F4 Pro V3

[MxFrs]

Hi,

I have an Omnibus F4 Pro V3 and want to use it with my FrSky R9 Mini Receiver. SBUS on UART1 is working without problem on the SBUS out Pin of the receiver. I tried to connect the SmartPort Pin to TX of UART3 of the FC and enabled SMartPort telemetry for that pin as well as activated telemetry in the INAV seetings. UNfortunately, the transmitter (TX16S with newest EdgeTX and external R9M Module) is unable to receive any telemetry apart from the internat measurements of the receiver. ChatGPT suggested using a SBUS inverter Board or similar setups because I need to invert the signal for SmartPort to work. I don't have such a board. Alternatively I wanted to use SoftwareSerial for example on PWM6 pad. Unfortunately, no matter which pin/resource I try, the FC never accepts my changes to set a resource as SoftwareSerial and on reboot after 'save' it shows the old resource mapping.

I did the following commands (also tried A08 and others):
resource SERVO 4 NONE
resource SERIAL_TX 11 A01
save

Any idea what the problem may be?
Attached you can find my dump file in case thats needed.

Thanks for you help!
Max
PIKE Backup V1.txt

[sensei-hacker]

You probably want to use one of the soft serial targets for your board.
https://github.com/iNavFlight/inav/blob/master/docs/boards/Omnibus%20F4.md

ChatGPT is of course a "large language model", a model of language. Designed to produce sentences, in your chosen style. But those sentences have nothing to do with reality. I think you'll find the documentation is about 50X more reliable than autocomplete (ChatGPT) is.

If you type medical words into ChatGPT, it will pick some random medical words to send back, making a sentence that has random medical words in it. If you type aviation words in, you'll get random aviation words back.(Literally part of the implementation is a random generator - it chooses random words that might be related, then forms a sentence using those random words.)