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Flutter plugin for connecting and communicationg with Bluetooth Low Energy devices, on Android and iOS

pub package


Introduction #

FlutterBluePlus is a bluetooth plugin for Flutter, a new app SDK to help developers build modern multi-platform apps. Note: this plugin is continuous work from FlutterBlue since maintaince stoped.

Alpha version #

This package must be tested on a real device.

Cross-Platform Bluetooth LE #

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

Using the FlutterBluePlus 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 #

FlutterBluePlus flutterBlue = FlutterBluePlus.instance;

Scan for devices #

// Start scanning
flutterBlue.startScan(timeout: Duration(seconds: 4));

// Listen to scan results
var subscription = flutterBlue.scanResults.listen((results) {
    // do something with scan results
    for (ScanResult r in results) {
        print('${r.device.name} found! rssi: ${r.rssi}');

// Stop scanning

Connect to a device #

// Connect to the device
await device.connect();

// Disconnect from device

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 c.read();

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

Read and write descriptors #

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

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

Set notifications and listen to changes #

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

Read the MTU and request larger size #

final mtu = await device.mtu.first;
await device.requestMtu(512);

Note that iOS will not allow requests of MTU size, and will always try to negotiate the highest possible MTU (iOS supports up to MTU size 185)

Getting Started #

Change the minSdkVersion for Android #

flutter_blue_plus is compatible only from version 19 of Android SDK so you should change this in android/app/build.gradle:

Android {
  defaultConfig {
     minSdkVersion: 19

Add permissions for Bluetooth #

We need to add the permission to use Bluetooth and access location:


In the android/app/src/main/AndroidManifest.xml let’s add:

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


In the ios/Runner/Info.plist let’s add:

	    <string>Need BLE permission</string>  
	    <string>Need BLE permission</string>  
	    <string>Need Location permission</string>  
	    <string>Need Location permission</string>  
	    <string>Need Location permission</string>

For location permissions on iOS see more at: https://developer.apple.com/documentation/corelocation/requesting_authorization_for_location_services

Reference #

FlutterBlue API #

scanStarts a scan for Bluetooth Low Energy devices.
stateStream of state changes for the Bluetooth Adapter.
isAvailableChecks whether the device supports Bluetooth.
isOnChecks if Bluetooth functionality is turned on.

BluetoothDevice API #

connectEstablishes a connection to the device.
disconnectCancels an active or pending connection to the device.
discoverServicesDiscovers services offered by the remote device as well as their characteristics and descriptors.
servicesGets a list of services. Requires that discoverServices() has completed.
stateStream of state changes for the Bluetooth Device.
mtuStream of mtu size changes.
requestMtuRequest to change the MTU for the device.
readRssiRead RSSI from a connected device.

BluetoothCharacteristic API #

readRetrieves the value of the characteristic.
writeWrites the value of the characteristic.
setNotifyValueSets notifications or indications on the characteristic.
valueStream of characteristic's value when changed.

BluetoothDescriptor API #

readRetrieves the value of the descriptor.
writeWrites the value of the descriptor.

Troubleshooting #

When I scan using a service UUID filter, it doesn't find any devices. #

Make sure the device is advertising which service UUID's it supports. This is found in the advertisement packet as UUID 16 bit complete list or UUID 128 bit complete list.

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Flutter plugin for connecting and communicationg with Bluetooth Low Energy devices, on Android and iOS

Repository (GitHub)


API reference


Icon for licenses.BSD-3-Clause (LICENSE)


collection, convert, flutter, meta, protobuf, rxdart


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