Cannot read Ethernet input in Signal K

[Alastair Duncan]

I have an RPI4, a Ship Modudul MiniPlex 3E-N2K, an old apple router which are all connected by ethernet cables. I struggled with the IP addresses but these all talk now.

I have wind/Depth and speed sensors connected to the Multiplexer either by wired connections for NMEA0183 and by small NMEA2000 backbone. I also added by USB a GPS sensor.

I can see the NMEA sentences coming into my RPI when I ping the multiplexer from the RPI Terminal window but in Signal K I can only see the USB GPS, nothing from the Ethernet cable connection.

I would be extremely grateful for help but please in the very simplest terms,  you are dealing with a bit of an IT moron here !