bluetooth

Description:

bluetooth

Introduction #
Type-safe, minimalistic Buetooth plugin for Flutter,
a fork from orignal "FlutterBlue" plugin.
Cross-Platform Bluetooth LE #
This plugin 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;
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Scan for devices #
/// Start scanning
var scanSubscription = flutterBlue.scan().listen((scanResult) {
// do something with scan result
});

/// Stop scanning
scanSubscription.cancel();
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Connect to a device #
/// Create a connection to the device
var deviceConnection = flutterBlue.connect(device).listen((s) {
if(s == BluetoothDeviceState.connected) {
// device is connected, do something
}
});

/// Disconnect from device
deviceConnection.cancel();
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Discover services #
List<BluetoothService> services = await device.discoverServices();
services.forEach((service) {
// do something with service
});
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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])
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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])
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Set notifications #
await device.setNotifyValue(characteristic, true);
device.onValueChanged(characteristic).listen((value) {
// do something with new value
});
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Reference #
FlutterBlue API #




Android
iOS
Description




scan
✅
✅
Starts a scan for Bluetooth Low Energy devices.


connect
✅
✅
Establishes 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 on the specified characteristic.


onValueChanged
✅
✅
Notifies when the characteristic's value has changed.


state
✅
✅
Gets the current state of the Bluetooth Device.


onStateChanged
✅
✅
Notifies of state changes for the Bluetooth Device.



Troubleshooting #
Scanning for service UUID's doesn't return any results #
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.