I'm having issues trying to get the Celestron Aux driver working with a homebrew Arduino based Aux bus to USB adapter. The project and my logs for this issue is detailed in this topic on CN.
Using this adapter in Windows works flawlessly with both CPWI and NexRemote. However, I can't seem to get the driver to initialize in Ekos. It appears looks like the handshake fails every time. I'm wondering if the driver is requiring cts/rts on the serial port. It looks like it is. If so, is there a way to disable that but still use the Aux protocol? The Tri-State buffering is handled by the Leonardo Arduino so the USB serial port wouldn't need it. I saw a brief mention of an experimental USB-Aux connection but selection USB/HC doesn't seem to work either (I assumed this was the aux wrapped in HC header protocol).