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Check out here serverfault.com/questions/967949/emulate-telnet-over-ssh in the Answer.
But replace 23 with 5007. Maybe not exactly what you need but something you can build on and make work for you.

Copied the mb25ioc32.so to the modules directory > same result as mentioned in my initial post.
A search to *pktuart* doesn't give any hit. So I don't know where to place these.

A compile of mb25ioc32.so delivers a mesa_modbus.o (and .c) in a tmp directory. I can find the source of this file at /usr/share/linuxcnc/ as mesa_modbus.o.tmpl.

Depending of the mode: Radius Mode or Diamiter Mode one off the DRO (R or D) is grey, meaning not active.
That way you see very quick with mode you did activate with your gcode.

Norbert

the fix for the GO HOME button in the qtdragon_hd Offsets frame

the setting is in the following file:

/usr/share/qtvcp/screens/qtdragon_hd/qtdragon_hd_handler.py

(you need to edit it with sudo nano on a terminal)

on the line 821 (in my case)
there is a section called

"# offsets frame"

and about 17 lines below there is a setting that you have to change to get the button to go where you want, it's the following:

"ACTION.CALL_MDI_WAIT("G53 G0 Z0") " <--- there it is! that Z0 you have to change to the Z value you want.

after that, save the file, restart your linuxcnc and the button will go to that position.

i hope it helps someone
cheers have a nice day!

the fix for the GO HOME button
i found it! (it took me days to do it but i'm so proud of myself for finding it)
the setting is in the following file:
/usr/share/qtvcp/screens/qtdragon_hd/qtdragon_hd_handler.py

(you need to edit it with sudo nano on a terminal)

on the line 821 (in my case)
there is a section called

"# offsets frame"

and about 17 lines below there is a setting that you have to change to ge the button to go where you want, it's the following:

"ACTION.CALL_MDI_WAIT("G53 G0 Z0") " <--- there it is! that Z0 you have to change to the Z value you want.

after that, save the file, restart your linuxcnc and the button will go to that position.

i hope it helps you.
have a nice day