Regular disconnects/reconnects by RVNC and no screen updates.

[Jodel]

hi,
I am using Openplotter on a Pi 4. I have the Pi set up as an AP to provide a hotspot to connect a tablet or phone to the Pi and to display the Pi screen on the tablet. I have done it numerous times in the past and it always worked fine.  I am using RVNC The connection works fine in the beginning. After about 20 or 30 seconds the tablet screen stops updating but the mouse cursor still will drive the Pi. Every minute or two after connection, the RVNC connection drops and reconnects. The PI AP is stable.  I am using the internal WiFi of the Pi. i also have a WiFi dongle connected but have not connected it to anything yet.  I am using X11  not Wayland.  I set up the AP using the Network manager GUI and I activated the VNC server using the Pi configuration tool.  I have a good power supply and everything else is working fine.
Any suggestions as to how I can fault find and fix?
Jodel

[baltika_no_9]

Maybe check that power save isn't set to on for your AP adapter?

Code:

iw dev wlanX get power_save

Where wlanX is your internal adapter.

[Jodel]

Maybe check that power save isn't set to on for your AP adapter?

Code:

iw dev wlanX get power_save

Where wlanX is your internal adapter.

Thanks for that suggestion.  I have power save off.

---

As I have set up networking a few times in different ways I think I may try to go back to basics and delete all current settings and start again.   I might also do a complete removal of RVNC and re install it.  I'll report back on progress!
Jodel

[Jodel]

Problem solved!  I tried 3 or 4 different VNC servers and 3 or 4 different apps on the tablet and all combinations gave similar problems. After a lot of interactions with various AI models it seems as if the Pi 4 and its internal WiFi chip were incapable of handling the load of serving all the screens to the tablet and also keeping sufficient data flow through the Access Point.  I used my phone as a temporary hotspot/AP /router  and it all worked perfectly. This took all the load of acting as an AP of the Pi.  I will now add a small travel router to the boat to handle networking/routing.
Jodel