halui

I'm making a physical knob & push-button interface for Axis. I have an Arduino board that is successfully sending and receiving messages with Axis.

The next thing I want to try/test is push one of the physical buttons and then link that incoming message (that I can presently observe in HalShow) to cause the X axis to jog one increment in the positive direction. Assume I have already selected the X axis and set the jog increment, I just need to activate the "+" jog button. I searched through all the pins, signals etc in HalShow and could not find that "+ jog button", the closest thing I found was joint.0.kb-jog-active that gets activated when I click on the jog button, so not exactly what I need.

In the LinuxCNC HAL tutorial part 2, he has a bunch halui signals defined in his custom_postgui.hal file (see below). Can I simply replicate what he has done to get access to these signals or do I need to something else to expose the pins shown in the right hand column?
 

Aciera, Thanks for that, I can now see the halui stuff in HalShow

I think I'm pretty close, but need a little help troubleshooting please.

The configuration:
Axis connected to an Arduino board, the Arduino board has a couple of digital inputs(6,7) and a couple of digital outputs(8,9) that are linked to LinuxCNC via a python script. The Arduino/Python portion seems to be working just fine, I can trigger Arduino outputs with HAL file links and I can observe digital inputs to the Arduino in Hal Watch.

What I'm trying to do:  when I activate digital input 6 on the Arduino, I want Axis to jog X in the positive direction, (as if I mouse clicked the + "X")
What I have done:  I added the following to postgui.hal:
   net  jog-x-pos  halui.axis.x.plus
   net jog-x-pos  <= arduino.din.6

Arduino input 6 happens to be configured with a pullup, so when I push the button the input goes low, so I set the arduino.din.6-invert bit

What's happening:
When input 6 NOT pushed; arduino.din.6 is yellow (because it's pulled up), halui.axis.x.plus and jog-x-pos are both dark, so far so good
While input 6 IS pushed; arduino.din.6 is dark (it's now low), halui.axis.x.plus and jog-x-pos are both yellow, so far so good
However Axis does not jog. Estop is good, machine power is on, X is selected, just no movement and joint.0.kb-jog-active remains dark.
If I mouse click the actual + jog button in Axis, X moves and the joint.0.kb-jog-active watch LED briefly flashes yellow.
So for whatever reason my button press is not actually causing Axis to jog.
Please see attached, and thanks in advance for any guidance...