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Description:

flutter simple bluetooth printer

flutter_simple_bluetooth_printer #
A library to discover printers, connect and send printer commands.
Inspired by:
flutter_pos_printer
bluetooth_print
flutter_bluetooth_serial
flutter_blue
Based on:
rxandroidble - Android
lightBlue - iOS
Features #

Android
iOS
Description

classic bluetooth
✅

Support Connect/Print classic bluetooth devices

get paired devices
✅

Get paried devices of Phone.

discovery
✅
✅
Scanning for Bluetooth Low Energy devices.

stop discovery
✅
✅
Stop scanning for Bluetooth Low Energy devices.

scan
✅
✅
Scan for Bluetooth LE devices until timeout is reached.

connect
✅
✅
Establishes a connection to the device.

disconnect
✅
✅
Cancels an connection to the device.

connect state
✅
✅
Stream of connect state changes for the Bluetooth Device.

current connect state
✅
✅
Get the lastest state of connect state.

write text
✅
✅
write text to the connected device.

write raw data
✅
✅
write Uint8List data to the connected device.

Permissions #
Android #
All required permissions are included in the library.
Including:

<uses-permission android:name="android.permission.BLUETOOTH" android:maxSdkVersion="30" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" android:maxSdkVersion="30" />


<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />



<uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
<uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
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See https://github.com/dariuszseweryn/RxAndroidBle for details.
This plugin will handle Runtime permissions request.
iOS #
Add permissions to ios/Runner/Info.plist:
<key>NSBluetoothAlwaysUsageDescription</key>
<string>Replace with your description here</string>
<key>NSBluetoothPeripheralUsageDescription</key>
<string>Replace with your description here</string>
<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
<string>Replace with your description here</string>
<key>NSLocationAlwaysUsageDescription</key>
<string>Replace with your description here</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>Replace with your description here</string>
<key>UIBackgroundModes</key>
<array>
<string>bluetooth-central</string>
<string>bluetooth-peripheral</string>
</array>
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Discovery & Stop discovery #
try{
var subsription = bluetoothManager.discovery().listen((device) {
// A new device is discovered.
devices.add(device);
});
Future.delayed(Duration(seconds: 20)).then((_) {
// Remember to stop discovery after use.
bluetoothManager.stopDiscovery();
subsription.cancel();
});
} on BTException catch(e){
print(e);
}
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Or listen to scanResults to get the full list of devices.
try{
bluetoothManager.discovery();
var subsription = bluetoothManager.scanResults.listen((list) {
// Every time a new device is discovered, the full list of devices is callback.
devices = list;
});
Future.delayed(Duration(seconds: 20)).then((_) {
// Remember to stop discovery after use.
bluetoothManager.stopDiscovery();
subsription.cancel();
});
} on BTException catch(e){
print(e);
}
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Scan #
Similar to Discovery, but stop automatically after timeout is reached.
try{
final devices = await bluetoothManager.scan(timeout: const Duration(seconds: 10));
} on BTException catch(e){
print(e);
}
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Connect #
try {
var _isConnected = await bluetoothManager.connect(address: selectedPrinter.address);
} on BTException catch (e) {
print(e);
}
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Print (by Text or Unit8List) #
try {
if (!await connect()) return; // Make sure connected to device before print
final isSuccess = await bluetoothManager.writeText(text);
// Or print by Unit8List
// final isSuccess = await bluetoothManager.writeRawData(codes);
} on BTException catch (e) {
print(e);
}
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Disconnect #
try {
await bluetoothManager.disconnect();
} on BTException catch (e) {
print(e);
}
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Listen to connect state #
var _subscriptionBtStatus = bluetoothManager.connectState.listen((status) {
print('$status');
});
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Get Paired Devices (Android Only) #
try {
final bondedDevices = await bluetoothManager.getAndroidPairedDevices();
} on BTException catch (e) {
print(e);
}
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See example for full example.