Uninitialized Inputs

Typically, inputs from subsystems are only updated during calls to periodic. Note that this means updated (non-default) input data is not available in the constructor. The solution is to either wait for the first periodic call or call periodic from within the constructor.

public class Example extends SubsystemBase {
    private final ExampleIO io;
    private final ExampleIOInputs inputs = new ExampleIOInputs();

    public Example(ExampleIO io) {
        this.io = io;

        // Inputs are not updated yet
        inputs.position;
    }

    @Override
    public void periodic() {
        io.updateInputs(inputs);
        Logger.processInputs("Example", inputs);

        // Inputs are now updated
        inputs.position;
    }
}