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Description:

esc pos bluetooth

esc_pos_bluetooth #

The library allows to print receipts using a Bluetooth printer. For WiFi/Ethernet printers, use esc_pos_printer library.
TODO (PRs are welcomed!) #

Split byte data into chunks: issue
Print QR Codes using the GS ( k command (printing QR code from an image already supported)
PDF-417 Barcodes using the GS ( k command
Line spacing using the ESC 3 <n> command

How to Help #

Test your printer and add it in the table: Wifi/Network printer or Bluetooth printer
Test and report bugs
Share your ideas about what could be improved (code optimization, new features...)
PRs are welcomed!

Tested Printers #
Here are some printers tested with this library. Please add the models you have tested to maintain and improve this library and help others to choose the right printer.
Generate a Ticket #
Simple Ticket with Styles: #
Ticket testTicket() {
final Ticket ticket = Ticket(PaperSize.mm80);

ticket.text(
'Regular: aA bB cC dD eE fF gG hH iI jJ kK lL mM nN oO pP qQ rR sS tT uU vV wW xX yY zZ');
ticket.text('Special 1: àÀ èÈ éÉ ûÛ üÜ çÇ ôÔ',
styles: PosStyles(codeTable: PosCodeTable.westEur));
ticket.text('Special 2: blåbærgrød',
styles: PosStyles(codeTable: PosCodeTable.westEur));

ticket.text('Bold text', styles: PosStyles(bold: true));
ticket.text('Reverse text', styles: PosStyles(reverse: true));
ticket.text('Underlined text',
styles: PosStyles(underline: true), linesAfter: 1);
ticket.text('Align left', styles: PosStyles(align: PosAlign.left));
ticket.text('Align center', styles: PosStyles(align: PosAlign.center));
ticket.text('Align right',
styles: PosStyles(align: PosAlign.right), linesAfter: 1);

ticket.text('Text size 200%',
styles: PosStyles(
height: PosTextSize.size2,
width: PosTextSize.size2,
));

ticket.feed(2);
ticket.cut();
return ticket;
}
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You can find more examples here: esc_pos_utils.
Print a Ticket #
PrinterBluetoothManager printerManager = PrinterBluetoothManager();

printerManager.scanResults.listen((printers) async {
// store found printers
});
printerManager.startScan(Duration(seconds: 4));

// ...

printerManager.selectPrinter(printer);
final PosPrintResult res = await printerManager.printTicket(testTicket());

print('Print result: ${res.msg}');
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For a complete example, check the demo project example/blue.
Troubleshooting #

If your printer prints only 5%-10% of an image and then stops, or it can't print more than 1 image on the same ticket, or it can't print long tickets, try to ajust queueSleepTimeMs of the PrinterBluetoothManager.printTicket (try 50 or 100ms): printerManager.printTicket(await demoReceipt(paper), queueSleepTimeMs: 50);

Test Print #