Pypilot update - broke all pypilot including i2c sensors

[AlanH]

Those two connect to eachother by LAN or WLAN, or maybe even serial / usb?
I am not sure as how to control the pilot through the primary 3b+ that runs Openplotter though,

It seems like all the internal communication is via TCP anyway. Maybe set up a connection on the network tab to send NMEA to the receiving PI's IP address?  You should already have something there if you're sending autopilot commands to OpenCPN.

You'll need to be a bit tricky about setting up the physical network.  Either run ethernet cables to an external router or set the second Pi to connect with the primary's access point.