Xiegu G90 CAT Tuner ideea

 The Xiegu G90 fans desperately need a CAT command to enable the TUNE on the built in ATU.

I think we will not see such an improvement too soon, maybe never.

So, just an ideea for a workaround:

The Rx DATA (input from PC) can be buffered to a uC to listen for CI-V standard command:

FE FE 00 00 1C 01 01 02 FD

When this is received, the uC will issue a command on the TUNE switch input of the Main Unit uC, thus enabling the TUNE.