Thank you for the reply.
Yes, using the Arduino.cc library manager, I installed Easy Nextion Library ver. 1.0.5, then performed a refresh in the Visual Micro Explorer / Manage Libraries.
(This may be moot. See below)
I then tested by adding the Nextion NexButton() function statement to my code. upon compilation, I received the error message,
ScintillatorMonitor.ino: 17:23: fatal error: NexButton.h: No such file or directory
#include "NexButton.h"
I then found the library: "ITEADLIB_Arduino_Nextion-0.7.0" which contains NexButton.h, etc, and added to the other libraries in: C:\Program Files (x86)\Arduino\libraries
Now, NexButton.h is found and the Build is successful.
(However, I don't know if these functions will be needed)
I understand that The Easy Nextion Library contains the four (or five) basic functions for serial comm. as described here:
https://github.com/Seithan/EasyNextionLibrary However, as per the example code I added:
#include "EasyNextionLibrary.h" // Include EasyNextionLibrary
And I added the class: EasyNex myNex(Serial);
so now, statements like:
myNex.writeNum("b0.bco", 2016);
compiles OK.
I have not yet written actual code to communicate with the Nextion display via. the DUE's serial lines. I will now attempt to do so.
Now, I should be able to use these 4 or 5 basic serial comm. functions.
The functions in the: ITEADLIB_Arduino_Nextion-0.7.0
like: NexButton() may not be needed.
Please excuse the apparent confusion.