UCCI engine communication question

[fire_varan]

Hi everyone.

The question is:

If I communicate with any UCCI engine I have (other than UFX) everything is OK

But in case of UFX engine, it tends to play on the same side as I.

But, if I connect UFX engine to WinBoard, everything is working just fine.
I have examined UCCI2WB code in order to determine what been sent to the stdin of engine, but did not find anything special.
Does anyone have a clue what I am missing?

Engines are here in case anyone needs them

https://easyupload.io/sybp7k

[fire_varan]

Found out that it works ok if using position fen <fenstring> moves ... instead of position startpos moves ...

[hgm]

I think 'position startpos' is not a valid command in UCCI. One always has to use 'fen' there to set up e position, even if it is the normal start postition for xiangqi. The idea of the designer of UCCI was probably that 'startpos' should be reserved for the initial position of orthodox chess.