Error Accessing change Attribute of Input on Expander Module

[angelom93]

Description

When attempting to access the change attribute of an input that is part of the expander module in the following code snippet:

when bump_code == 1 and bumper_front.change > 0 then bump_code = 2; end
an error occurs during the startup of the ESP. The issue does not arise when the input is not part of the expander.

Error Message

The error message displayed is:

rosys/hardware/communication/serial_communication.py:75: read: error while loading startup script: unknown property "change"@78

[falkoschindler]

I think this issue will be fixed by #18:

To support rules for proxy modules, we need a way to wait for their counterpart on the expander. Could we implement something like proxy.await_broadcast(timeout: float = 5.0) which blocks until the next broadcast is received?