The program always hangs after the command M3

Thank you for trying to help, of course, wait for a solution.

Thank you for trying to help, of course, wait for a solution.

The fact that setting the spindle-at-speed pin to true allowed the machine to continue running confirms that your lack of a connection to that signal is your problem.

When you deleted the line "net spindle-at-speed => motion.spindle-at-speed" and Linuxcnc failed to start, It was because you have a connection to that signal in your custom post gui hal file. Could you share that file so we can make a better recommendation what you should try next?

Bingo!
In the file: custom_postgui.hal, it was this:
# Include your customized HAL commands here
# The commands in this file are run after the AXIS GUI (including PyVCP panel) starts

sets spindle-at-speed false

I changed the value false to true, and the program continues.
Thanks

Could you also please help me with setting buttons Spindle, half, =0, safe-Z and homing on the XHC HB04?
I put that question here in the forum, but unfortunately unanswered.
Basic buttons are active so that I can move the machine.
It took a while before I understood reading on the local forum what I do.
However, the rest of the keys setting is beyond me skills.
I am aware that it goes beyond my original question, if it's necessary I open a new topic.
Thanks in advance