New code generation concept: instead of generating the whole ticket, commands…

New code generation concept: instead of generating the whole ticket, commands sent separately for each command

CHANGELOG.md

+## [4.0.0]
+
+- New code generation concept: instead of generating the whole ticket, commands sent separately for each command
+- `PrinterNetworkManager` replaced by `NetworkPrinter`
+- Bump esc_pos_utils
+
 ## [3.2.9]
 
 - Bump esc_pos_utils

README.md

@@ -30,36 +30,31 @@ Here are some [printers tested with this library](printers.md). Please add the m
 ### Simple Ticket with Styles:
 
 ```dart
-Ticket testTicket() {
-  // Using default profile
-  final profile = await CapabilityProfile.load();
-  final Ticket ticket = Ticket(PaperSize.mm80, profile);
-
-  ticket.text(
+void testReceipt(NetworkPrinter printer) {
+  printer.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',
+  printer.text('Special 1: àÀ èÈ éÉ ûÛ üÜ çÇ ôÔ',
+      styles: PosStyles(codeTable: 'CP1252'));
+  printer.text('Special 2: blåbærgrød',
+      styles: PosStyles(codeTable: 'CP1252'));
+
+  printer.text('Bold text', styles: PosStyles(bold: true));
+  printer.text('Reverse text', styles: PosStyles(reverse: true));
+  printer.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',
+  printer.text('Align left', styles: PosStyles(align: PosAlign.left));
+  printer.text('Align center', styles: PosStyles(align: PosAlign.center));
+  printer.text('Align right',
       styles: PosStyles(align: PosAlign.right), linesAfter: 1);
 
-  ticket.text('Text size 200%',
+  printer.text('Text size 200%',
       styles: PosStyles(
         height: PosTextSize.size2,
         width: PosTextSize.size2,
       ));
 
-  ticket.feed(2);
-  ticket.cut();
-  return ticket;
+  printer.feed(2);
+  printer.cut();
 }
 ```
 
@@ -70,9 +65,16 @@ You can find more examples here: [esc_pos_utils](https://github.com/andrey-ushak
 ```dart
 import 'package:esc_pos_printer/esc_pos_printer.dart';
 
-final PrinterNetworkManager printerManager = PrinterNetworkManager();
-printerManager.selectPrinter('192.168.0.123', port: 9100);
-final PosPrintResult res = await printerManager.printTicket(testTicket());
+const PaperSize paper = PaperSize.mm80;
+final profile = await CapabilityProfile.load();
+final printer = NetworkPrinter(paper, profile);
+
+final PosPrintResult res = await printer.connect('192.168.0.123', port: 9100);
+
+if (res == PosPrintResult.success) {
+  testReceipt(printer);
+  printer.disconnect();
+}
 
 print('Print result: ${res.msg}');
 ```

example/discover_printers/ios/Flutter/.last_build_id

-6d52d4ce4fb1beead3ee79b19e241be0
+50d596c07db937a14e616078f41e1aa4
\ No newline at end of file

example/discover_printers/lib/main.dart

@@ -92,27 +92,24 @@ class _MyHomePageState extends State<MyHomePage> {
       });
   }
 
-  Future<Ticket> testTicket(PaperSize paper) async {
-    final profile = await CapabilityProfile.load();
-    final Ticket ticket = Ticket(paper, profile);
-
-    ticket.text(
+  Future<void> testReceipt(NetworkPrinter printer) async {
+    printer.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',
+    printer.text('Special 1: àÀ èÈ éÉ ûÛ üÜ çÇ ôÔ',
         styles: PosStyles(codeTable: 'CP1252'));
-    ticket.text('Special 2: blåbærgrød',
+    printer.text('Special 2: blåbærgrød',
         styles: PosStyles(codeTable: 'CP1252'));
 
-    ticket.text('Bold text', styles: PosStyles(bold: true));
-    ticket.text('Reverse text', styles: PosStyles(reverse: true));
-    ticket.text('Underlined text',
+    printer.text('Bold text', styles: PosStyles(bold: true));
+    printer.text('Reverse text', styles: PosStyles(reverse: true));
+    printer.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',
+    printer.text('Align left', styles: PosStyles(align: PosAlign.left));
+    printer.text('Align center', styles: PosStyles(align: PosAlign.center));
+    printer.text('Align right',
         styles: PosStyles(align: PosAlign.right), linesAfter: 1);
 
-    ticket.row([
+    printer.row([
       PosColumn(
         text: 'col3',
         width: 3,
@@ -130,7 +127,7 @@ class _MyHomePageState extends State<MyHomePage> {
       ),
     ]);
 
-    ticket.text('Text size 200%',
+    printer.text('Text size 200%',
         styles: PosStyles(
           height: PosTextSize.size2,
           width: PosTextSize.size2,
@@ -140,39 +137,34 @@ class _MyHomePageState extends State<MyHomePage> {
     final ByteData data = await rootBundle.load('assets/logo.png');
     final Uint8List bytes = data.buffer.asUint8List();
     final Image image = decodeImage(bytes);
-    ticket.image(image);
+    printer.image(image);
     // Print image using alternative commands
-    // ticket.imageRaster(image);
-    // ticket.imageRaster(image, imageFn: PosImageFn.graphics);
+    // printer.imageRaster(image);
+    // printer.imageRaster(image, imageFn: PosImageFn.graphics);
 
     // Print barcode
     final List<int> barData = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 4];
-    ticket.barcode(Barcode.upcA(barData));
+    printer.barcode(Barcode.upcA(barData));
 
     // Print mixed (chinese + latin) text. Only for printers supporting Kanji mode
-    // ticket.text(
+    // printer.text(
     //   'hello ! 中文字 # world @ éphémère &',
     //   styles: PosStyles(codeTable: PosCodeTable.westEur),
     //   containsChinese: true,
     // );
 
-    ticket.feed(2);
-
-    ticket.cut();
-    return ticket;
+    printer.feed(2);
+    printer.cut();
   }
 
-  Future<Ticket> demoReceipt(PaperSize paper) async {
-    final profile = await CapabilityProfile.load();
-    final Ticket ticket = Ticket(paper, profile);
-
+  Future<void> printDemoReceipt(NetworkPrinter printer) async {
     // Print image
     final ByteData data = await rootBundle.load('assets/rabbit_black.jpg');
     final Uint8List bytes = data.buffer.asUint8List();
     final Image image = decodeImage(bytes);
-    ticket.image(image);
+    printer.image(image);
 
-    ticket.text('GROCERYLY',
+    printer.text('GROCERYLY',
         styles: PosStyles(
           align: PosAlign.center,
           height: PosTextSize.size2,
@@ -180,14 +172,16 @@ class _MyHomePageState extends State<MyHomePage> {
         ),
         linesAfter: 1);
 
-    ticket.text('889  Watson Lane', styles: PosStyles(align: PosAlign.center));
-    ticket.text('New Braunfels, TX', styles: PosStyles(align: PosAlign.center));
-    ticket.text('Tel: 830-221-1234', styles: PosStyles(align: PosAlign.center));
-    ticket.text('Web: www.example.com',
+    printer.text('889  Watson Lane', styles: PosStyles(align: PosAlign.center));
+    printer.text('New Braunfels, TX',
+        styles: PosStyles(align: PosAlign.center));
+    printer.text('Tel: 830-221-1234',
+        styles: PosStyles(align: PosAlign.center));
+    printer.text('Web: www.example.com',
         styles: PosStyles(align: PosAlign.center), linesAfter: 1);
 
-    ticket.hr();
-    ticket.row([
+    printer.hr();
+    printer.row([
       PosColumn(text: 'Qty', width: 1),
       PosColumn(text: 'Item', width: 7),
       PosColumn(
@@ -196,7 +190,7 @@ class _MyHomePageState extends State<MyHomePage> {
           text: 'Total', width: 2, styles: PosStyles(align: PosAlign.right)),
     ]);
 
-    ticket.row([
+    printer.row([
       PosColumn(text: '2', width: 1),
       PosColumn(text: 'ONION RINGS', width: 7),
       PosColumn(
@@ -204,7 +198,7 @@ class _MyHomePageState extends State<MyHomePage> {
       PosColumn(
           text: '1.98', width: 2, styles: PosStyles(align: PosAlign.right)),
     ]);
-    ticket.row([
+    printer.row([
       PosColumn(text: '1', width: 1),
       PosColumn(text: 'PIZZA', width: 7),
       PosColumn(
@@ -212,7 +206,7 @@ class _MyHomePageState extends State<MyHomePage> {
       PosColumn(
           text: '3.45', width: 2, styles: PosStyles(align: PosAlign.right)),
     ]);
-    ticket.row([
+    printer.row([
       PosColumn(text: '1', width: 1),
       PosColumn(text: 'SPRING ROLLS', width: 7),
       PosColumn(
@@ -220,7 +214,7 @@ class _MyHomePageState extends State<MyHomePage> {
       PosColumn(
           text: '2.99', width: 2, styles: PosStyles(align: PosAlign.right)),
     ]);
-    ticket.row([
+    printer.row([
       PosColumn(text: '3', width: 1),
       PosColumn(text: 'CRUNCHY STICKS', width: 7),
       PosColumn(
@@ -228,9 +222,9 @@ class _MyHomePageState extends State<MyHomePage> {
       PosColumn(
           text: '2.55', width: 2, styles: PosStyles(align: PosAlign.right)),
     ]);
-    ticket.hr();
+    printer.hr();
 
-    ticket.row([
+    printer.row([
       PosColumn(
           text: 'TOTAL',
           width: 6,
@@ -248,9 +242,9 @@ class _MyHomePageState extends State<MyHomePage> {
           )),
     ]);
 
-    ticket.hr(ch: '=', linesAfter: 1);
+    printer.hr(ch: '=', linesAfter: 1);
 
-    ticket.row([
+    printer.row([
       PosColumn(
           text: 'Cash',
           width: 8,
@@ -260,7 +254,7 @@ class _MyHomePageState extends State<MyHomePage> {
           width: 4,
           styles: PosStyles(align: PosAlign.right, width: PosTextSize.size2)),
     ]);
-    ticket.row([
+    printer.row([
       PosColumn(
           text: 'Change',
           width: 8,
@@ -271,14 +265,14 @@ class _MyHomePageState extends State<MyHomePage> {
           styles: PosStyles(align: PosAlign.right, width: PosTextSize.size2)),
     ]);
 
-    ticket.feed(2);
-    ticket.text('Thank you!',
+    printer.feed(2);
+    printer.text('Thank you!',
         styles: PosStyles(align: PosAlign.center, bold: true));
 
     final now = DateTime.now();
     final formatter = DateFormat('MM/dd/yyyy H:m');
     final String timestamp = formatter.format(now);
-    ticket.text(timestamp,
+    printer.text(timestamp,
         styles: PosStyles(align: PosAlign.center), linesAfter: 2);
 
     // Print QR Code from image
@@ -296,33 +290,33 @@ class _MyHomePageState extends State<MyHomePage> {
     //   final imgFile = await qrFile.writeAsBytes(uiImg.buffer.asUint8List());
     //   final img = decodeImage(imgFile.readAsBytesSync());
 
-    //   ticket.image(img);
+    //   printer.image(img);
     // } catch (e) {
     //   print(e);
     // }
 
     // Print QR Code using native function
-    // ticket.qrcode('example.com');
+    // printer.qrcode('example.com');
 
-    ticket.feed(2);
-    ticket.cut();
-    return ticket;
+    printer.feed(1);
+    printer.cut();
   }
 
   void testPrint(String printerIp, BuildContext ctx) async {
-    final PrinterNetworkManager printerManager = PrinterNetworkManager();
-    printerManager.selectPrinter(printerIp, port: 9100);
-
     // TODO Don't forget to choose printer's paper size
     const PaperSize paper = PaperSize.mm80;
+    final profile = await CapabilityProfile.load();
+    final printer = NetworkPrinter(paper, profile);
 
-    // TEST PRINT
-    // final PosPrintResult res =
-    //     await printerManager.printTicket(await testTicket(paper));
+    final PosPrintResult res = await printer.connect(printerIp, port: 9100);
 
+    if (res == PosPrintResult.success) {
       // DEMO RECEIPT
-    final PosPrintResult res =
-        await printerManager.printTicket(await demoReceipt(paper));
+      await printDemoReceipt(printer);
+      // TEST PRINT
+      // await testReceipt(printer);
+      printer.disconnect();
+    }
 
     final snackBar =
         SnackBar(content: Text(res.msg, textAlign: TextAlign.center));

example/discover_printers/pubspec.yaml

@@ -18,7 +18,7 @@ dependencies:
   intl: ^0.16.1
   qr_flutter: ^3.2.0
   path_provider: ^1.6.5
-  esc_pos_utils: ^0.4.9
+  esc_pos_utils: ^1.0.0
   # esc_pos_utils:
   # path: ../../../esc_pos_utils
   charset_converter: ^1.0.3

example/example.dart

-// import 'dart:io';
-// import 'dart:typed_data';
-// import 'package:flutter/services.dart';
-// import 'package:image/image.dart';
-import 'package:esc_pos_printer/esc_pos_printer.dart';
-import 'package:esc_pos_utils/esc_pos_utils.dart';
-
-void main() async {
-  final PrinterNetworkManager printerManager = PrinterNetworkManager();
-  // To discover network printers in your subnet, consider using
-  // ping_discover_network package (https://pub.dev/packages/ping_discover_network).
-  // Note that most of ESC/POS printers are available on port 9100 by default.
-  printerManager.selectPrinter('192.168.0.123', port: 9100);
-
-  final PosPrintResult res =
-      await printerManager.printTicket(await testTicket());
-  print('Print result: ${res.msg}');
-}
-
-Future<Ticket> testTicket() async {
-  final profile = await CapabilityProfile.load();
-  final Ticket ticket = Ticket(PaperSize.mm80, profile);
-
-  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: 'CP1252'));
-  ticket.text('Special 2: blåbærgrød', styles: PosStyles(codeTable: 'CP1252'));
-
-  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.row([
-    PosColumn(
-      text: 'col3',
-      width: 3,
-      styles: PosStyles(align: PosAlign.center, underline: true),
-    ),
-    PosColumn(
-      text: 'col6',
-      width: 6,
-      styles: PosStyles(align: PosAlign.center, underline: true),
-    ),
-    PosColumn(
-      text: 'col3',
-      width: 3,
-      styles: PosStyles(align: PosAlign.center, underline: true),
-    ),
-  ]);
-
-  ticket.text('Text size 200%',
-      styles: PosStyles(
-        height: PosTextSize.size2,
-        width: PosTextSize.size2,
-      ));
-
-  // Print image
-  // final ByteData data = await rootBundle.load('assets/logo.png');
-  // final Uint8List bytes = data.buffer.asUint8List();
-  // final Image image = decodeImage(bytes);
-  // ticket.image(image);
-  // Print image using alternative commands
-  // ticket.imageRaster(image);
-  // ticket.imageRaster(image, imageFn: PosImageFn.graphics);
-
-  // Print barcode
-  final List<int> barData = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 4];
-  ticket.barcode(Barcode.upcA(barData));
-
-  // Print mixed (chinese + latin) text. Only for printers supporting Kanji mode
-  // ticket.text(
-  //   'hello ! 中文字 # world @ éphémère &',
-  //   styles: PosStyles(codeTable: PosCodeTable.westEur),
-  //   containsChinese: true,
-  // );
-
-  ticket.feed(2);
-
-  ticket.cut();
-  return ticket;
-}

lib/esc_pos_printer.dart

@@ -8,4 +8,4 @@
 library esc_pos_printer;
 
 export './src/enums.dart';
-export './src/printer_network_manager.dart';
+export 'src/network_printer.dart';

lib/src/network_printer.dart

+/*
+ * esc_pos_printer
+ * Created by Andrey Ushakov
+ * 
+ * Copyright (c) 2019-2020. All rights reserved.
+ * See LICENSE for distribution and usage details.
+ */
+
+import 'dart:io';
+import 'dart:typed_data' show Uint8List;
+import 'package:esc_pos_utils/esc_pos_utils.dart';
+import 'package:image/image.dart';
+import './enums.dart';
+
+/// Network Printer
+class NetworkPrinter {
+  NetworkPrinter(PaperSize paperSize, CapabilityProfile profile,
+      {int spaceBetweenRows = 5}) {
+    _generator =
+        Generator(paperSize, profile, spaceBetweenRows: spaceBetweenRows);
+  }
+
+  Generator _generator;
+  Socket _socket;
+
+  Future<PosPrintResult> connect(String host,
+      {int port = 91000, Duration timeout = const Duration(seconds: 5)}) async {
+    try {
+      _socket = await Socket.connect('192.168.0.101', port, timeout: timeout);
+      _socket.add(_generator.reset());
+      return Future<PosPrintResult>.value(PosPrintResult.success);
+    } catch (e) {
+      return Future<PosPrintResult>.value(PosPrintResult.timeout);
+    }
+  }
+
+  void disconnect() {
+    _socket.destroy();
+  }
+
+  // ************************ Printer Commands ************************
+  void reset() {
+    _socket.add(_generator.reset());
+  }
+
+  void text(
+    String text, {
+    PosStyles styles = const PosStyles(),
+    int linesAfter = 0,
+    bool containsChinese = false,
+    int maxCharsPerLine,
+  }) {
+    _socket.add(_generator.text(text,
+        styles: styles,
+        linesAfter: linesAfter,
+        containsChinese: containsChinese,
+        maxCharsPerLine: maxCharsPerLine));
+  }
+
+  void setGlobalCodeTable(String codeTable) {
+    _socket.add(_generator.setGlobalCodeTable(codeTable));
+  }
+
+  void setGlobalFont(PosFontType font, {int maxCharsPerLine}) {
+    _socket
+        .add(_generator.setGlobalFont(font, maxCharsPerLine: maxCharsPerLine));
+  }
+
+  void setStyles(PosStyles styles, {bool isKanji = false}) {
+    _socket.add(_generator.setStyles(styles, isKanji: isKanji));
+  }
+
+  void rawBytes(List<int> cmd, {bool isKanji = false}) {
+    _socket.add(_generator.rawBytes(cmd, isKanji: isKanji));
+  }
+
+  void emptyLines(int n) {
+    _socket.add(_generator.emptyLines(n));
+  }
+
+  void feed(int n) {
+    _socket.add(_generator.feed(n));
+  }
+
+  void cut({PosCutMode mode = PosCutMode.full}) {
+    _socket.add(_generator.cut(mode: mode));
+  }
+
+  void printCodeTable({String codeTable}) {
+    _socket.add(_generator.printCodeTable(codeTable: codeTable));
+  }
+
+  void beep({int n = 3, PosBeepDuration duration = PosBeepDuration.beep450ms}) {
+    _socket.add(_generator.beep(n: n, duration: duration));
+  }
+
+  void reverseFeed(int n) {
+    _socket.add(_generator.reverseFeed(n));
+  }
+
+  void row(List<PosColumn> cols) {
+    _socket.add(_generator.row(cols));
+  }
+
+  void image(Image imgSrc, {PosAlign align = PosAlign.center}) {
+    _socket.add(_generator.image(imgSrc, align: align));
+  }
+
+  void imageRaster(
+    Image image, {
+    PosAlign align = PosAlign.center,
+    bool highDensityHorizontal = true,
+    bool highDensityVertical = true,
+    PosImageFn imageFn = PosImageFn.bitImageRaster,
+  }) {
+    _socket.add(_generator.imageRaster(
+      image,
+      align: align,
+      highDensityHorizontal: highDensityHorizontal,
+      highDensityVertical: highDensityVertical,
+      imageFn: imageFn,
+    ));
+  }
+
+  void barcode(
+    Barcode barcode, {
+    int width,
+    int height,
+    BarcodeFont font,
+    BarcodeText textPos = BarcodeText.below,
+    PosAlign align = PosAlign.center,
+  }) {
+    _socket.add(_generator.barcode(
+      barcode,
+      width: width,
+      height: height,
+      font: font,
+      textPos: textPos,
+      align: align,
+    ));
+  }
+
+  void qrcode(
+    String text, {
+    PosAlign align = PosAlign.center,
+    QRSize size = QRSize.Size4,
+    QRCorrection cor = QRCorrection.L,
+  }) {
+    _socket.add(_generator.qrcode(text, align: align, size: size, cor: cor));
+  }
+
+  void drawer({PosDrawer pin = PosDrawer.pin2}) {
+    _socket.add(_generator.drawer(pin: pin));
+  }
+
+  void hr({String ch = '-', int len, int linesAfter = 0}) {
+    _socket.add(_generator.hr(ch: ch, linesAfter: linesAfter));
+  }
+
+  void textEncoded(
+    Uint8List textBytes, {
+    PosStyles styles = const PosStyles(),
+    int linesAfter = 0,
+    int maxCharsPerLine,
+  }) {
+    _socket.add(_generator.textEncoded(
+      textBytes,
+      styles: styles,
+      linesAfter: linesAfter,
+      maxCharsPerLine: maxCharsPerLine,
+    ));
+  }
+  // ************************ (end) Printer Commands ************************
+}

lib/src/printer_network_manager.dart

-/*
- * esc_pos_printer
- * Created by Andrey Ushakov
- * 
- * Copyright (c) 2019-2020. All rights reserved.
- * See LICENSE for distribution and usage details.
- */
-
-import 'dart:io';
-import 'package:esc_pos_utils/esc_pos_utils.dart';
-import './enums.dart';
-
-/// Printer Network Manager
-class PrinterNetworkManager {
-  String _host;
-  int _port;
-  Duration _timeout;
-
-  /// Select a network printer
-  ///
-  /// [timeout] is used to specify the maximum allowed time to wait
-  /// for a connection to be established.
-  void selectPrinter(
-    String host, {
-    int port = 9100,
-    Duration timeout = const Duration(seconds: 5),
-  }) {
-    _host = host;
-    _port = port;
-    _timeout = timeout;
-  }
-
-  Future<PosPrintResult> printTicket(Ticket ticket) {
-    if (_host == null || _port == null) {
-      return Future<PosPrintResult>.value(PosPrintResult.printerNotSelected);
-    } else if (ticket == null || ticket.bytes.isEmpty) {
-      return Future<PosPrintResult>.value(PosPrintResult.ticketEmpty);
-    }
-
-    return Socket.connect(_host, _port, timeout: _timeout)
-        .then((Socket socket) {
-      socket.add(ticket.bytes);
-      socket.destroy();
-      return Future<PosPrintResult>.value(PosPrintResult.success);
-    }).catchError((dynamic e) {
-      return Future<PosPrintResult>.value(PosPrintResult.timeout);
-    });
-  }
-}

pubspec.yaml

 name: esc_pos_printer
 description: The library allows to print receipts using an ESC/POS thermal WiFi printer.
-version: 3.2.9
+version: 4.0.0
 homepage: https://github.com/andrey-ushakov/esc_pos_printer
 
 environment:
@@ -9,7 +9,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  esc_pos_utils: ^0.4.9
+  esc_pos_utils: ^1.0.0
   # esc_pos_utils:
   #   path: ../esc_pos_utils
   charset_converter: ^1.0.3