LUA Serial Communication

Hey all,

I'm trying to design some physical Repairable Ship Components that are basically Arduino's with some kind of sensor combination.

The idea is that within the Mission Script - something causes Shields or Beam Weapons etc to loose power, a Serial message (possibly a single char) is sent to the Arduino that is the "Shield Matrix" or "Beam Weapon Control Conduits".
The Arduino then requires fixing - when this is done the Arduino sends another Serial Char that is picked up by the Mission Script and puts Shields/Beams Power back to Full..

I'm having issues getting a Mission Script to successfully send a single Char over Serial..
I have tried the following methods (for Windows) in several places in the Mission Script:

   file = io.open("COM6","wb")

   io.output(file)

   io.write("B")

^ this one seems to allow the Script to load and I can see the Mission Assets in the Game Master screen but does not send anything over Serial (Arduino is configured to light up its built-in LED upon receiving the letter "B")

and

   Arduino_Com_Port = com.open("COM6", 115200, 0)

   com.write(Arduino_Com_Port, "B")

^ this one has issues with the 'Global com not being recognized'

any help would be greatly appreciated
Thank you!

Start by tracing the Mission Script serial APIs shown in the issue, comparing the io.open/io.write attempt with the com.open/com.write attempt and the reported global-com error. Done means a Mission Script can send the character "B" to the Arduino and receive a response that restores the relevant system power.