Hello, because my setup is placed in the field outside the village I live in and me returning home once it's running, I can't directly access it.
Though sometimes it doesn't behave as expected, and needs some manual intervention.

Now I've bought a 4G USB dongle (Mobile wifi) and a data sim.
To try out if I can create a link with 4G.

According to RealVNC this should be possible.

Now what I would like to know: Can I just install and use this on a 'fresh' Stellarmate 1.7.8 on a Raspberry pi 4 or do I need to do something alike disabling the current VNC server and / or the hotspot?

If this works, I could now and then check in with the setup from home and fix any issues that arise.

Otherwise, it's quite happy in the field!

Ok, this is pretty cool, because I think it actually works now.

For hardware I got a basic model 4G LTE USB modem. It accepts a SIM card and is powered by USB. It also creates a hotspot. Very comparable to creating a hotspot on your phone.
I use a prepaid SIM with 2 GB valid for a year (I have no idea how much it will use, but using it 'every now and then', it doesn't need to be too much.

I've installed RealVNC server on the Rpi4 by:
Sudo apt-get update
Sudo apt-get install realvnc-vnc-server

Raspi config: enable vnc

On the RealVNC website you can create an account, in the account details, create a plan that includes the cloud service (I use the free 'lite' plan).

On the Raspberry I've got the connection to the 4G hotspot created and set to high priority (20).
In RealVNC I'm logged in using my account credentials.

On my tablet / computer I also log in with these credentials.

Startup: create the hotspot first by powering the 4G wifi modem.
Then start the raspberry pi

And the device shows up as available in the VNC viewer on my computer / tablet!

Now I can leave my setup really remote and check in now and then. I just like to share this because it may be of use to other 'semi remote operators' here