flutter_blue 0.1.0

Bluetooth plugin for Flutter

Introduction

FlutterBlue is a bluetooth plugin for Flutter, a new mobile SDK to help developers build modern apps for iOS and Android.

Cross-Platform Bluetooth LE

FlutterBlue aims to offer the most from both platforms (iOS and Android).

Using the FlutterBlue instance, you can scan for and connect to nearby devices (BluetoothDevice). Once connected to a device, the BluetoothDevice object can discover services (BluetoothService), characteristics (BluetoothCharacteristic), and descriptors (BluetoothDescriptor). The BluetoothDevice object is then used to directly interact with characteristics and descriptors.

Usage

Obtain an instance

FlutterBlue flutterBlue = FlutterBlue.instance;

Scan for devices

/// Start scanning
StreamSubscription scanSubscription = flutterBlue.startScan().listen((scanResult) {
    // do something with scan result
});

/// Stop scanning
flutterBlue.stopScan();

Connect to a device

BluetoothDevice device = await flutterBlue.connect(scanResult.identifier);

Discover services

List<BluetoothService> services = await device.discoverServices();
services.forEach((service) {
    // do something with service
});

Read and write characteristics

// Reads all characteristics
var characteristics = service.characteristics;
for(BluetoothCharacteristic c in characteristics) {
    List<int> value = await device.readCharacteristic(c);
    print(value);
}

// Writes to a characteristic
await device.writeCharacteristic(c, [0x12, 0x34])

Read and write descriptors

// Reads all descriptors
var descriptors = characteristic.descriptors;
for(BluetoothDescriptor d in descriptors) {
    List<int> value = await device.readDescriptor(d);
    print(value);
}

// Writes to a descriptor
await device.writeDescriptor(d, [0x12, 0x34])

Set notifications

await device.setNotifyValue(characteristic, true);
device.onValueChanged(characteristic).listen((value) {
    // do something with new value
});

Reference

FlutterBlue API

	Android	iOS	Description
startScan	✅	⬜	Starts a scan for Bluetooth Low Energy devices.
stopScan	✅	⬜	Stops a scan for Bluetooth Low Energy devices.
connect	✅	⬜	Establishes a connection to the Bluetooth Device.
cancelConnection	✅	⬜	Cancels a connection to the Bluetooth Device.
state	✅	⬜	Gets the current state of the Bluetooth Adapter.
onStateChanged	✅	⬜	Stream of state changes for the Bluetooth Adapter.

BluetoothDevice API

	Android	iOS	Description
discoverServices	✅	⬜	Discovers services offered by the remote device as well as their characteristics and descriptors.
services	✅	⬜	Gets a list of services. Requires that discoverServices() has completed.
readCharacteristic	✅	⬜	Retrieves the value of a specified characteristic.
readDescriptor	✅	⬜	Retrieves the value of a specified descriptor.
writeCharacteristic	✅	⬜	Writes the value of a characteristic.
writeDescriptor	✅	⬜	Writes the value of a descriptor.
setNotifyValue	✅	⬜	Sets notifications or indications for the value of a specified characteristic.
onValueChanged	✅	⬜	Notifies when the Bluetooth Characteristic's value has changed.
canSendWriteWithoutResponse	⬜	⬜	Indicates whether the Bluetooth Device can send a write without response.
state	⬜	⬜	Gets the current state of the Bluetooth Device.
onStateChanged	⬜	⬜	Stream of state changes for the Bluetooth Device.