I wanted the ability to monitor/configure our TAB 400 Victron system without having to go to the trailer. I looked into Bluetooth range extenders and noting simple really exists. Didn't want to spend the $$$ on a Cerbo GX system.
I thought about installing a mini PC in the TAB for Remote Desktop and then discovered Victron Connect does not allow Bluetooth connections using Windows. IOS doesn't easily allow Remote Desktop connection.
TeamViewer has a free Android host. Once installed and logged in you can remote desktop to your Android phone. I had an old Android phone laying around so it will permanently stay in the TAB powered on and charging.
Only requirement is you have a TeamViewer account and internet access inside the TAB. TeamViewer still has free accounts as long as you don't do any commercial stuff with it.
If you have a MK3 device you can configure your Multiplus using this method. I'm going to look for some type of USB C splitter so I can charge and connect to the Multiplus at the same time.
Some screenshots attached.