[OP2] Output NMEA0183 data through serial port

[abarrow]

Until an OP2 version of Kplex is ready, have you tried using OpenCPN? You can define output streams there. You can also install Kplex on your RPI4 directly using apt (sudo apt install kplex). You'd have to get it going manually, though. That means creating a config file and setting it up so that it starts when your RPI starts. Probably the easiest way to do that would be inserting a command in /etc/rc.local to start kplex with your config file.