Start printing a gcode that will generate error, such as moving print head out of boundary.
Wait for the Klipper to spit out error, such as !! Move out of range: 363.749 277.273 20.200 [-5.000]
BUG: the app shows a "Connect" button, whereas the printer is still connected to Klipper. Clicking "Connect' button will cause the app to "wait for serial port" forever.
Steps to reproduce:
!! Move out of range: 363.749 277.273 20.200 [-5.000]