How to read chat with a procedure activated by a GUI?

So i want to make a mod that will check if your Arduino UNO is connected to the PC and MCreator Link before continuing, and I want to execute the command: (in the name of the player)

/link devices

And I want to make a procedure triggered by another procedure that will read what the chat sends back.

Can I do this?

If so, I would love to know how.