Garry - there may be something in this thread that interests you https://zroadster.org/threads/wifi-diagnostics.4619/ if you have the right phone or an iPad...........Just need to make sure my laptop can support it, or could just get another cheap tablet as long as it's got enough memory
I have the old BMtechnics package which I can just about still run off an old Windows laptop. On last years road trip to France/Spain I wanted the re-assurance of being able to read codes in event of problems but didn't want to lug the laptop as well. I already had the 20pin adaptor so I bought a cheap wifi unit and downloaded a free code reader app from auto.doc.