Update VNC instructions to use RealVNC and support the latest WayVNC

[nathan-contino]

• closes https://github.com/raspberrypi/documentation/issues/3525

[ghollingworth]

Note, currently Simon's Mac based RealVNC session does not work with WayVNC, so this should be held off committing until that has been tested, released and confirmed.

[nathan-contino]

Just this morning, I used RealVNC to connect to WayVNC running the December 2023 Bookworm release on a Pi 5. The linked issue claims that "RealVNC client works fine now that RSA-AES is implemented". Happy to hold off until we've done more testing, but technically I have tested and confirmed it now!

[spl237]

I have one Mac on which RealVNC works fine (my home Mac) and one Mac on which it fails to connect (my work Mac) - same version of VNC Viewer, same network etc. Still trying to work out what the difference is...

[JamesH65]

If anyone needs a MAC for testing I have a Mac Mini available on my desk.

[nathan-contino]

Curious. I'll give it a try on my older Intel Mac that isn't running the latest macOS version, see if I can reproduce the issue. I could see macOS versions or architecture presenting an issue.

[spl237]

I've found the problem. Under the Expert settings on VNC Viewer, if ColorLevel is set to pal8, then wayvnc just drops the connection; all other options for ColorLevel are valid and result in a working connection.

I have raised this with the wayvnc developer to see if it is fixable - the quick and dirty fix is not to use ColorLevel = pal8, but that was the default value it was set to on one of my Macs. (But oddly not the other...)

[aallan]

Waiting for internal comments.

[aallan]

Closing this in favour of more light weight changes.