How to debug?

[JumpinJon]

I'm having problems trying to develop apps for the built-in UI, i.e system/apps/myApp/init.py

What is the best way to debug these apps? I need to be able to output diags to the console - either by print("foo") or logging.debug("bar") - and examine that, but I can't work out how to achieve that.

I'm currently editing my app in Notepad++ from the mounted drive in USB Disk Mode. (Once I reboot the Tufty, of course the editor is then unhappy that the current file is on an ejected device.) If I get an error, that is displayed on the screen, but not the console output as described above.

Thonny doesn't seem to quite support these devices properly. I can force a Stop and see the device, but the file system seems to be Read-only?? What am I missing?

[JumpinJon]

Update: I have progressed, in that I can now see my print("") output.

I boot the Tufty into Disk mode; make my code changes and save. I then hit the button on the rear to reboot into runtime more.

Then, I can flip over to Thonny and Ctrl-F2 to Stop the device; F5 to boot it and use the UI on the Turfty to load my app, and I see the debug output in Thonny's console.