Forwarding serial port over network and back to serial char device on remote host (socat?)
Solution 1:
You should be able to use the PIPE address type of socat to create a Unix pipe to connect to, for example (assuming that the device with the real serial device creates the network connection):
socat PIPE:/dev/fakesocatserial0 TCP-LISTEN:1234
Solution 2:
have you tried sshfs? You can simply mount remote:/dev into somewhere like local:/remote/dev and point to the actual character device