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/*  
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    /\\\/////////\\\ \/\\\///////////  \/////\\\///  \///////\\\/////  \/\\\       \/\\\   /\\\\\\\\\\\\\  \/\\\\\\   \/\\\        
    \//\\\      \///  \/\\\                 \/\\\           \/\\\       \/\\\       \/\\\  /\\\/////////\\\ \/\\\/\\\  \/\\\       
      \////\\\         \/\\\\\\\\\\\         \/\\\           \/\\\       \/\\\\\\\\\\\\\\\ \/\\\       \/\\\ \/\\\//\\\ \/\\\      
          \////\\\      \/\\\///////          \/\\\           \/\\\       \/\\\/////////\\\ \/\\\\\\\\\\\\\\\ \/\\\\//\\\\/\\\     
              \////\\\   \/\\\                 \/\\\           \/\\\       \/\\\       \/\\\ \/\\\/////////\\\ \/\\\ \//\\\/\\\    
        /\\\      \//\\\  \/\\\                 \/\\\           \/\\\       \/\\\       \/\\\ \/\\\       \/\\\ \/\\\  \//\\\\\\   
        \///\\\\\\\\\\\/   \/\\\\\\\\\\\\\\\  /\\\\\\\\\\\       \/\\\       \/\\\       \/\\\ \/\\\       \/\\\ \/\\\   \//\\\\\  
           \///////////     \///////////////  \///////////        \///        \///        \///  \///        \///  \///     \/////  
*/  
//           ______________________________________________
            //--------CREATED BY SEITANIS THANASIS--------\\
           //---------------VERSION 13/9/2019--------------\\
          //----------------- www.seithan.com --------------\\
         //----------------seithagta@gmail.com---------------\\
        //------ code for Sent values from Nextion and -------\\
       //----------- store them on Arduino variables ----------\\
                               
/*  Example Code on How to send values from Nextion and store them on Arduino for any use.
 *  No need for Nextion Library
    
 *  Copyright (C) 2019 author: THANASIS SEITANIS contact: seithagta@gmail.com
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  any later version.

 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <https://www.gnu.org/licenses/>.

 *  Not legally state for the distribution terms:
 *  It is permitted to copy and distribute native copies of the Program source code
 *  exactly as you have obtained it, on any storage medium, provided that: 
 *  you will prominently and appropriately publish, in each copy, a copyright notice 
 *  and a disclaimer of guarantee - that you will integrally include all notes mentioned
 *  in this License and in the absence of any warranty - and, finally, that you will provide
 *  each other recipient of the Program with a copy of this License together with the Program.
 *  You should make sure that the modified files provide prominent notes
 *  indicating the modification of the files and the date of modification.
 */
//------END OF COPYRIGHT NOTICE AND DISCLAIMER OF GUARANTEE------//

#define Nextion Serial
/* define that Serial will de writed as Nextion (when we write Nextion.print the  compiler read Serial.print)    
 *By define the Nextion as Serial you can change at ones the serial port at the hole code,
 * with changing the Serial to Serial1 for example
 */

 int Step_var = 0 ;       // Variable to store the Step value that we sent from Nextion
 int Direction_var = 0 ; //  Variable to store the direction value that we sent from Nextion

void setup(){

 
  
  Nextion.begin(9600); // starting the serial port at 9600. NEXTION MUST HAVE THE SAME RATE. For this we write at
                         //  first page to the preinitialize event the command @  baud=9600  @ 
                         // NOTE "bauds" will change the default baud rate off 9600 until it changed again
  delay(500);
}


void loop(){

  Nextion_serial_listen();
  
  
 
}


void Nextion_serial_listen() 

{
    if(Nextion.available() > 2){                // Read if more then 2 bytes come (we always send more than 2 <#> <len> <cmd> <id>
        char start_char = Nextion.read();      // Create a local variable (start_char) read and store the first byte on it  
        if(start_char == '#'){                // And when we find the character #
          uint8_t len = Nextion.read();      // Create local variable (len) / read and store the value of the second byte
                                            // <len> is the lenght (number of bytes following) 
          unsigned long tmr_1 = millis();
          boolean cmd_found = true;
            
          while(Nextion.available() < len){ // Waiting for all the bytes that we declare with <len> to arrive              
            if((millis() - tmr_1) > 100){    // Waiting... But not forever...... 
              cmd_found = false;              // tmr_1 a timer to avoid the stack in the while loop if there is not any bytes on Serial
              break;                            
            }                                     
            delay(1);                            // Delay for nothing delete it if you want
          }                                   
                                               
            if(cmd_found == true){            // So..., A command is found (bytes in Serial buffer egual more than len)
              uint8_t cmd = Nextion.read();  // Create local variable (cmd). Read and store the next byte. This is the command group
                                             
              switch (cmd){
                                    
                case 'V': /*or <case 0x56:>  IF 'V' matches, we have the command group "Sent Variables". 
                           *The next byte  according to our protocol is the value for the <Step_var>
                           */
                     Step_var = Nextion.read() * 10 ;  // we read and store the byte at the variable
                     
                     // The next byte  according to our protocol is the value for the <Direction_var>
                     
                     Direction_var = Nextion.read();   // we store and store the byte at the variable
                     



                      Nextion.print("n0.val="); // Those lines is for the debug on Nextion
                      Nextion.print(Step_var);  // they sent the variables at the         
                      NextionEndCommand();      // numeric Component  n0 
                      
                      Nextion.print("n1.val=");    // Those lines is for the debug on Nextion
                      Nextion.print(Direction_var);     // they sent the variables at the     
                      NextionEndCommand();            // numeric Component  n1
                     
                  break;
                
                                
              }
            }
        }  
    }    
}

void NextionEndCommand()
{
    // with this two ways we can sent the 3 bytes so Nextion can understand the end of a command. Choose freerly.
    
  /* Nextion.write(0xff);
     Nextion.write(0xff);
     Nextion.write(0xff); */
  
    Nextion.print("\xFF\xFF\xFF");
  
 
}

The .zip file contains a .HMI file for Nextion and a .ino file for Arduino

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