Send and set object values in Nextion LCDs on Arduino or general Serials

send-nextion.c

// Usage:
// setObj ("OBJECT.PROPS", "VALUE");
// obj - name and propertie of object
// txt - value
// example:
// setObj("t0.txt", "Test");
// Warning: Your IDE (as Arduino) is very likely that be UTF-8 wich causes the LCD don't renders the exact string that you pass to setObj
void setObj( char *obj, char *txt ){
  Serial.write(0xFF); Serial.write(0xFF); Serial.write(0xFF); // Usefull when Serial connected to LCD is the same of Debug (my case in NODEMCU)
  for (;*obj != 0; obj++) Serial.write(*obj); 
  Serial.write(0x3D);Serial.write(0x22);      // ="
  for (;*txt != 0; txt++) Serial.write(*txt);
  Serial.write(0x22);                         // "
  Serial.write(0xFF); Serial.write(0xFF); Serial.write(0xFF);
}