@kl3m3n Hi,
Thanks for reviewing my issue.
I have resigned to the fact that the cheapy ATMPC is probably not going to work with the 'ethernet' connection, and have taken on your suggestion to do the development on the Samsung and use the initialisation strings on the ATMPC.
I tried a test UI created on the Samsung using the GUI-O Live Designer, copied the initialisation strings into modified ESP32 code, created a new IoT device on the ATMPC and - Bingo! - worked a treat.
Thanks very much
Cheers
Steve