Too Long; Didn't Read
Label printers can support programming languages like TSPL, ZPL, EPL, and so on. We can build labels using T SPL commands like `BARCODE` and `QRCODE. For instance, if we want to print a label with a text and barcode, we use these commands with their properties like position or size, and send these commands to the label printer over Bluetooth or Serial connection. The number of dots per inch depends on the printer's DPI.