Since you are familiar with java it would be not too difficult to write a networking control program using processing.org platform and libraries, and being java based it should be not too hard to merge with your control program. Sorry I'm only familiar with java using the processing IDE and using it for GUI and connecting to microcontrollers. It works on windows, linux, ARM single board puters (PI), and android (hard to work on).

processing networking library. Check out the carnivore library (mentioned here also) for packet sniffing and real-time traffic monitoring. https://processing.org/tutorials/network

A quick search shows controlling a printer from processing requires importing Java Print Service API javax.print .

https://docs.oracle.com/javase/8/docs/technotes/guides/jps/index.html

The last comment here shows an example of this on processing.

https://forum.processing.org/beta/num_1264455306.html