Thank you both for the advice. I have installed dmx workshop and it reports that the configuration is ok (DMX out) (DMX in is not a concern for what I am doing)
I have also put WireShark onn the system so I can see the communication. I will try to get some captures later on this week - is there any advice on what filters to use to see the data? There seems to be lost of stuff with seemingly random universes flying around.
I take the suggestion about having the DMX network interface separate from all the other traffic (i.e having a wifi router specifically for this, or not having the other traffic around). I could do this, but I would rather keep it on th4e same network through the house so ultimately on could use any personal device to control the house lighting. I know ArtNet in this case is using broadcast, but when alongside all the other protocols on the network it does get a bit messy.
Again thank you for the advice and I will continue investigating.
Best Regards