Fluetooth - Flutter library for sending bytes to Bluetooth devices on Android/iOS

Related tags

Bluetooth fluetooth
Overview

A Flutter library for sending bytes to Bluetooth devices. Available on Android and iOS.

Android Setup

This library is only compatible for Android SDK 21+, so we need this in android/app/build.gradle

Android {
  defaultConfig {
     minSdkVersion 21

iOS Setup

This library needs Bluetooth permissions on iOS, so we need this in ios/Runner/Info.plist

...
<key>NSBluetoothAlwaysUsageDescription</key>
<string>Need BLE permission for connecting to BLE devices</string>
<key>NSBluetoothPeripheralUsageDescription</key>
<string>Need BLE permission for retrieving BLE devices info</string>
...

Examples

We'll need esc_pos_gen for this example.

First prepare a bill to be printed.

...
final List<PosComponent> components = <PosComponent>[
    const PosText.center('My Store'),
    const PosSeparator(),
    PosListComponent.builder(
    count: 20,
    builder: (int i) {
        return PosListComponent(
        <PosComponent>[
            PosRow.leftRightText(
            leftText: 'Product $i',
            leftTextStyles: const PosStyles.defaults(),
            rightText: 'USD $i',
            ),
            PosRow.leftRightText(
            leftText: '1 x USD $i',
            leftTextStyles: const PosStyles.defaults(
                fontType: PosFontType.fontB,
            ),
            rightText: 'USD $i',
            rightTextStyles: const PosStyles.defaults(
                align: PosAlign.right,
                fontType: PosFontType.fontB,
            ),
            ),
        ],
        );
    },
    ),
    const PosSeparator(),
    PosBarcode.code128('{A12345'.split('')),
    const PosSeparator(),
    const PosFeed(1),
    const PosCut(),
];

final Paper paper = Paper(
    generator: generator,
    components: components,
);
...

Retrieve available bluetooth devices.

final List<FluetoothDevice> devices = await Fluetooth().getAvailableDevices();

Connect to a printer.

...
final FluetoothDevice printer = devices.first;
await Fluetooth().connect(printer.id);

Prints the bill to the printer

...
await Fluetooth().sendBytes(paper.bytes);
...
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Comments
  • It works on android but not on ios

    It works on android but not on ios

    I'm using this plugin to print receipts on a thermal printer. On Android it works correctly. But not on iOS. The printer is detected and connected, but it gives an error when printing. I tested the sample code and it also fails to print.

    [VERBOSE-2:ui_dart_state.cc(198)] Unhandled Exception: PlatformException(FLUETOOTH_ERROR, The device does not support receiving bytes!, null, null)
#0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:607:7)
#1      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:167:18)
<asynchronous suspension>
#2      _MyAppState._print (package:fluetooth_example/main.dart:142:5)
<asynchronous suspension>

    flutter doctor -v
[✓] Flutter (Channel stable, 3.0.5, on macOS 12.5 21G72 darwin-x64, locale en-US)
    • Flutter version 3.0.5 at /Users/muriloventuroso/Downloads/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision f1875d570e (9 days ago), 2022-07-13 11:24:16 -0700
    • Engine revision e85ea0e79c
    • Dart version 2.17.6
    • DevTools version 2.12.2

[✗] Android toolchain - develop for Android devices
    ✗ Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/docs/get-started/install/macos#android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, please use
      `flutter config --android-sdk` to update to that location.


[✓] Xcode - develop for iOS and macOS (Xcode 13.4.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • CocoaPods version 1.11.3

[✗] Chrome - develop for the web (Cannot find Chrome executable at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome)
    ! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.

[!] Android Studio (not installed)
    • Android Studio not found; download from https://developer.android.com/studio/index.html
      (or visit https://flutter.dev/docs/get-started/install/macos#android-setup for detailed instructions).

[✓] VS Code (version 1.69.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension can be installed from:
      🔨 https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[✓] Connected device (2 available)
    • iPhone (mobile) • 00008030-001C211411E8802E • ios        • iOS 15.5 19F77
    • macOS (desktop) • macos                     • darwin-x64 • macOS 12.5 21G72 darwin-x64

[✓] HTTP Host Availability
    • All required HTTP hosts are available

! Doctor found issues in 2 categories.
    opened by muriloventuroso 2
Releases(0.0.2)

  • 0.0.2(Jan 2, 2022)

    What's Changed

    • 💉fix(android): fix methods by @iandis in https://github.com/iandis/fluetooth/pull/4
    • Docs/fix docs by @iandis in https://github.com/iandis/fluetooth/pull/5
    • 🍭chore(example): update esc_pos_gen by @iandis in https://github.com/iandis/fluetooth/pull/6
    • 🍭chore(version): bump 0.0.2 by @iandis in https://github.com/iandis/fluetooth/pull/7

    Full Changelog: https://github.com/iandis/fluetooth/compare/0.0.1...0.0.2

    Source code(tar.gz)
    Source code(zip)

  • 0.0.1(Jan 1, 2022)

    What's Changed

    • 🚀Refactor(Android): New non-blocking thread by @iandis in https://github.com/iandis/fluetooth/pull/1
    • 🚀 New Feature: iOS support by @iandis in https://github.com/iandis/fluetooth/pull/2
    • Update README, prepare to release by @iandis in https://github.com/iandis/fluetooth/pull/3

    New Contributors

    • @iandis made their first contribution in https://github.com/iandis/fluetooth/pull/1

    Full Changelog: https://github.com/iandis/fluetooth/commits/0.0.1

    Source code(tar.gz)
    Source code(zip)
Owner
Iandi Santulus
a senior cs student who loves building apps using Flutter
Iandi Santulus
GitHub
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