Here is the latest on what ArchiveSW is doing.
The Hub is connected to the RPi for power and Wi-Fi. The RPi is connected via Ethernet to send the data to WeatherFlow.
The RPi has a battery UPS that will power everything. If main power is list or I disconnect the POE the RPi continues to store data. This is great during a storm when you need to record and monitor weather data. This also allows you to make the entire station mobile. That is great for sailors, pilots, campers and even hang gliders. With a POE adapter it can be powered by 12vdc.
Warning. This setup can draw more than 2 maps. As you can see in the third photo, the Hub is only getting 4.8 vdc. While that is sufficient any fluctuation could cause the Hub to reboot. Look for a battery backup that can supply sufficient power or use two UPS units.