Event listener on MCP23017 without interrupt GPIOs

[jozala]

Is it possible to use event listener on DigitalInputDevice built with MCP2317 as a DeviceFactory?

I create input device like this:

DigitalInputDevice inputDevice = DigitalInputDevice.Builder
      .builder(1)
      .setDeviceFactory(new MCP23017(I2CConstants.CONTROLLER_0, 0x20, INTERRUPT_GPIO_NOT_SET, INTERRUPT_GPIO_NOT_SET))
      .setPullUpDown(GpioPullUpDown.PULL_UP)
      .build()

then I am able to read input device state correctly with inputDevice.value, but listener is never called when I add listener with the following code:

inputDevice.addListener((event) -> LOGGER.info("Input device state changed"))

I am guessing it has something to do with no interrupt GPIOs. However, my hardware doesn't have any of INTA nor INTB connected.
Do I need to implement a busy loop in that case myself?

[mattjlewis]

You are correct - events can only be triggered by diozero if INTA or INTB are connected and configured, diozero avoids polling for event notification.