Question about inactive state

[WTTien]

Hi, in the diagram showed in section 6 of README.md, in the "inactive" primary states, it shows "read" and "write" function can be called. In my understanding, "read" and "write" interacts with actual hardware movement (so they will actuate a motor, read data from sensors output etc.) In a robot "inactive" state, normally then what situation would people use "read" and "write" function for?

I don't have much experience working with real life robots so question might sound silly 😬