Linuxcncrsh reading a hal pin?

I suppose this isn't limited to linuxcncrsh but I need a method of pushing the value out to linuxcncrsh. If I want to set a pin it just looks like:
...to pass a value into an M1xx file. But how do I read the pin value into linuxcncrsh? is it just an echo or something in the mcode file with the mcode file being something like:
I'll be getting help with this from somebody who's more competent then me with this. I just need to know the method of doing it.

I didn't even realize halrmt was a thing.

I was hoping you'd chime in since you're the resident expert. It looks like halrmt doesn't take gcodes, where linuxcncrsh does and that is what I need.

I'm trying to use openPnP with LinuxCNC as the controller. OpenPnP pipes out gcode typically to a 3d printer style controller over a serial or ethernet port so I'm looking to use linuxcncrsch for this purpose with a local port. OpenPnP uses a "gcodeDriver" which is configurable for however it needs to be so I'm in the middle of setting up the driver for linuxcncrsh. The method of setting hal oins with Mcodes through linuxcncrsh seems fine.

I believe OpenPnP can support multiple gcode drivers/controllers. So it's probably possible that I can use both linuxcncrsh and halrmt, they seem to share the same command/confirm structure. The doc only mentions halrmt being started from the terminal but can it be started from the hal file like linuxcncrsh?

so if I use DISPLAY=linuxcncrsh, then in hal
loadusr halrmt --[otherStuff]
does that work or is there a better way to achieve what I'm trying to do?

Not sure how promising this sounds...
lol well I hope it does

Well I suppose I can add that to the list of experiments. Thanks for mentioning it though, I probably would not have found it.