Well it would appear that I had moved the CEM25p USB cable from the Pegasus box over to the Odroid, I've put it back to the Pegasus and it's now working.
I can connect to the mount, I must have moved that cable without paying attention as I'm building the new observatory. silly me...
Kstars Mac osx
Odroid C4 / WO Redcat51 / CEM25p / ZWO533MC / QHY5L-II-M (OAG)