what do you mean with 'Enum string reference'?
Concerning the aspects of how to exchange data between the GUI application and the device, I recommend you the chapter Integrating with the device (especially the section Be careful when exchanging strings).
Also interesting is the chapter Implementing a Device Interface. It explains the concept of so-called Device Interface represented by a Chora class. Through this interface the GUI and the device can communicate.
I hope it helps you further.
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