how to add error message to the axis interface?

good afternoon. I wanted to ask for your help, I'm not finding a way to implement an error massage that can be activated and seen at any time in the axis interface, I tried using an mdi command and activating it to show a debug with the message I need , however the mdi command only works under certain conditions, the machine has to be referenced and cannot be working, if it is outside these conditions the mdi does not work and the message does not appear. For example, I have a PLC on my machine, I am monitoring communication, if there is a loss of communication, the machine must stop and trigger an error message saying that communication has been lost, and this has to happen at any time, the shutdown part The machine I got was very easy, but I can't do this part of the message correctly, could you help me? I'm using glade vcp to customize the axis, but I didn't find any dialog box with the hal pin to make this message either. thanks in advance.

see the MESSAGE comp: linuxcnc.org/docs/html/man/man9/message.9.html