I wanted to upgrade my campervan system consisting of a MultiPlus 12/500/20-16 with switch connected to toggle between charging only and invertor, SmartShunt, Battery protector, Buck Boost 400 and Lithium SuperPack 12.8V 100ah in order to allow limiting the input current for shore power so I bought a Ve.bus smart dongle and connected it (just the UTP cable and power cables directly to the Lithium battery with ground through the shunt first). It showed up in the app, found the MultiPlus, showed the data but after about 30 seconds it went to initializing again repeating the process. It also did not allow me to update the settings for the MultiPlus. With this 'reset' I could hear a relay click and see the red and green led briefly blink on the MultiPlus. The moment I disconnect the UTP cable the MultiPlus behaves again. I replaced the UTP cable with another high quality patch cable but this behaves exactly the same.
I'm not sure what else I could try to get this to work, are there any known remedies?
App when it happens: https://www.youtube.com/watch?v=l6Keoj3vrxA
MultiPlus when it happens: https://www.youtube.com/watch?v=ru5aYPJpAqM