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I am stuck on this issue, where I need to run both rospy.spin() in order to subscribe to the topic, and Tkinter.mainloop(), in order for the GUI to work.

May I know how do I run both at the same time?

This has a really short answer: you don't.

See #q106781 for some explanation.

I am stuck on this issue, where I need to run both rospy.spin() in order to subscribe to the topic, and Tkinter.mainloop(), in order for the GUI to work.

May I know how do I run both at the same time?

This has a really short answer: you don't.

See #q106781 for some explanation.

Summary: rospy.spin() doesn't do much more than sleeping (here). In roscpp, things are different, see some of the other Q&As on this site for that.