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vi is very old-school. Nano is somewhat easier. I use it with SSH to edit files on another pc. The Linuxcnc includes geany  which is a GUI based text editor

I can't see why the new planner can't be put in its own folder under /src/emc together with its build system. Surely linuxcnc's make system can call another build environment. In fact some of the lcnc code is written in c++   

Have a look at the header files in src/emc/rs274ngc. Classs don't exist in C  

hakan is on the right track
There are a couple of xml files here with configs for Rtelligent and Deiwu I.O modules created exactly how endian menrions
github.com/rodw-au/linuxcnc-cia402

 If you get a USB wifi dongle with an external antenna you can get a SMA extension cable with a bulkhead connector on the end. Drill hole through enclosure, insert fitting and attach with supplied nut, and attach the antenna from the dongle. I have done this a few times now.

small update moving forward with this.

Found another problem that seems to have fixed it. The machine is manufactured in the east, the input switches/buttons go through a wide metal clamp that I assumed was frame grounding the shielding of the wire, it was not. When I earth grounded the shield with the setp suggestion the random EStop trip seems to have stopped. It will take more tests to be sure.

Input common is Negative on the 24v PS. Limit switches are inductive and signal 24v when tripped, EStop will be 24V normal, 0V when triggered.

Yes, limits triggering will also cause a fault and change to machine-off state.
Maybe a wiring issue with the input common, or just limits/estop wired
near power signals.
 

ok there is a freight train at the end of the tunnel!
It worked sort of. Not stable but it did show what is happening.
I put the setp on all inputs.
The EStop I now see toggles which it should not. The EStop is not actually wired yet and will be normally closed so there is always a 24V. Would this stop noise? The limits send 24V when detected but the spindle is not running. Will a limit triggering while operating cause any issue?