Hi Edson,
When establishing serial communication I'll not use LCD, but I find it useful to be able to connect the LCD while doing tests with arduino.
If you prefer to try it with your code, for my part it would be enough with 16x2 or 20x4 LCD support. (I hate OLED screens).
I thank you again your support, and while I wait for your news I'll be entertained with arduino code.
73 Germ¨¢n.
German