Utilizar librerias nextion

void setMenu(void){
  
  switch(setMenu_type){
    
    case 1:

      if(set_button == 1){
        brightval++; 
        sb--; 
      }
      
       if (set_button == 2){
        
        brightval--; 
         sb++;   
         
      }
       brightval = constrain (brightval, 1, 15); 
      sb = constrain(sb, 1, 15);
       if (prev_variable != brightval){
          prev_variable = brightval;
      
            color1 = load_color(c1); 
            color2 = load_color(c2); 
            color3 = load_color(c3); 
            flclr1 = load_color(c4); 
            flclr2 = load_color(c5); 
            
           Serial2.print("valor_brillo.val="); 
           Serial2.print(brightval); 
           ff(); 

            testlights(4);

      }    

    break;

//AJUSTE BRILLO
void up1PopCallback(void *ptr)
{
  setMenu_type = 1;
  set_button = 1;
  setMenu();
}

void down1PopCallback(void *ptr)
{ setMenu_type = 1;
  set_button = 2;
  setMenu();
}

void m0PopCallback(void *ptr)
{
  brillo.show();
  Serial2.print("valor_brillo.val=");
  Serial2.print(brightval);
  ff();

}