There is no I/O element that would indicate when device receives a message so no event can be configured based on that.
As for your other idea, could you please elaborate?
I/O elements is data that device receives, and they are not permanent values that once set remain in place unless changed. They are changing according to what device receives, so if device stops receiving any value it goes back to default value, which could be just an empty value.
Please explain it in more detail how do you imagine full solution.