Re: CAT control of uBITX
KD8CEC's software has CAT control. You can download it via his website: http://www.hamskey.com/2019/04/release-cec-firmware-v1200-for-ubitx.html
Since you have a V3, make sure you download the one for V3. Match it up with a Nextion screen and you will love the upgrade even more!