fontSize method
Sets the character size
The parameter size ranges from 0 to 255, where bits 0 to 3 set the character height
and bits 4 to 7 set the character width link : https://files.for-t.ru/Printers_receipts
Implementation
ESCPOS fontSize(ESCFontSize size) {
_data += Uint8List.fromList([29, 33, size.value]);
return this;
}