How to get value from rpi into Igntion

[pturmel]

Jython cannot load the shared libraries that provide full access to the GPIO pins. The pigpiod service is your best bet, but no-one has taken the time to test/deploy in jython yet.

Maker and Rasbery pi & Jetson nano GPIO access

I recommend running the pigpiod daemon and connecting to its socket interface from a long-lived asynchronous thread. The client-side python module for that project looks jython-compatible, but you might want to optimize it. Python’s socket module is notoriously laggy in jython.