It looks like this plugin doesn't support notification characteristics. Is it possible?

As title Says , can we get Manufacturer data of Scanned Devices , i know name and id is available Api , so it will be tricky to add manufacturer data in BluetoothDevice
but At least we have filter by Manufacturer data option in requestDevice, can you implement that in this plugin

@jeroen1602 How can I determine the device with which the interaction is currently taking place. My program works with the same type of devices with different IDs. I need to show the user the number of the device with which he is now interacting.
The code below permanently prints all devices that were connected during the current browser session.
At the same time, the browser works with the last one connected, how to determine the last one?

FlutterWebBluetooth.instance.devices.listen((devices) {
      for (var device in devices) {
        print(device.name);
        device.connected.listen((connected) {
          if (connected) {
            print('Connected ${device.name}');
          }
        });
      }

can u support MTU size api?

Hi,
After going through a ton of effort, I'm still unable to read data. Please help!
I'm using this simple code to read data from a characteristic but the value stream seems to be empty.

readCharacteristic = await services
                  .firstWhere((service) => service.uuid == SERVICE_UUID)
                  .getCharacteristic(READ_UUID);

print("read characteristic: ${readCharacteristic.uuid}");
await readCharacteristic.startNotifications();

try {
  await readCharacteristic.value
      .timeout(Duration(seconds: 5))
      .firstWhere((element) {
    print("buffer: ${element.buffer}");
    print("elementSizeInBytes: ${element.elementSizeInBytes}");
    print("lengthInBytes: ${element.lengthInBytes}");
    print("offsetInBytes: ${element.offsetInBytes}");
    return false;
  });
} catch (e) {
  print("err: $e");
}

I printed out the readCharacteristic.uuid to make sure that the characteristic is recognized properly. But when I'm expecting to receive data immediately, after 10 seconds the timeout exceeds and I catch a timeout error which I suppose indicates that the stream was empty until that time. If I'm being correct, at least my terminal should have prompted the properties of whatever ByteData is being received.

I have also tried .lastValue.

To make sure that my transmitter device is indeed transmitting, I successfully read data using two other platforms using a similar method.

Regards.

Chrome 114 now support exclusion lists. So this library should also support it.
https://developer.chrome.com/articles/bluetooth/#exclusion-filters

It looks like this plugin doesn't support advertisement. Is it possible?

According to the API: https://developer.mozilla.org/en-US/docs/Web/API/BluetoothRemoteGATTService#methods

It seems this is currently implemented:

BluetoothRemoteGATTService.getCharacteristic() 
Returns a Promise to an instance of BluetoothRemoteGATTCharacteristic for a given universally unique identifier (UUID).

But not this:

BluetoothRemoteGATTService.getCharacteristics() 
Returns a Promise to an Array of BluetoothRemoteGATTCharacteristic instances for an optional universally unique identifier (UUID).

I am trying to retrieve a list of characteristics from a given service, these UUID's could be unknown so I cant get by UUID. It seems like flutter_web_bluetooth does not have this yet.

This is my code

 bool sup = FlutterWebBluetooth.instance.isBluetoothApiSupported;
    print('isBluetoothApiSupported  ' + sup.toString());
    FlutterWebBluetooth.instance.isAvailable.listen((event) {
      print('isAvailable  ' + event.toString());
    });

    final requestOptions = RequestOptionsBuilder.acceptAllDevices(optionalServices: BluetoothDefaultServiceUUIDS.VALUES.map((e) => e.uuid).toList());

    try {
      final BluetoothDevice device = await FlutterWebBluetooth.instance.requestDevice(requestOptions);

      print(device);
      device.connected.listen((event) {
        print('connected  ' + event.toString());
      });
      await device.connect();
      print('connect');

      sers = await device.discoverServices();
      print('sers  ' + sers.toString());
      device.services.listen((event) {
        setState(() {
          sers2 = event;
          print('services.listen  ' + sers.toString());
        });
      });
    } on UserCancelledDialogError {
      print(1);
    } on DeviceNotFoundError {
      print(2);
    }
  }

I run on MacOS with Android Studio, This is the console:

isBluetoothApiSupported true
isAvailable true
isAvailable true
Instance of 'BluetoothDevice'
connected true
connect
connected true
sers []

I can connect, but I can't get any services
How to resolve?

creating a Bluetooth communication web application in flutter.

I am using flutter_web_bluetooth: ^0.2.1 library for achieve the bluetooth functionality.

• First I enable the Experimental Web Platform Features flag in chrome
• After enable write code for current browser supports the web bluetooth api.

Issue

In my chrome Experimental Web Platform Features flag is enable, but when i run the code in flutter after that a new chrome tab is open, in it the browser is showing browser web bluetooth api support false because the Experimental Web Platform Features flag appears disabled even after enabling the flag . Again i enabled the flag and restarted, And then run the Flutter application and again the flag is disable.
how can i enable this flag?

Screenshots/ GIF

1. Ran flutter create
2. Added package to pubspect.yaml
3. Ran application
4. Getting warning

Flutter Doctor output

Warning: Operand of null-aware operation '!' has type 'Set<BluetoothDevice>' which excludes null
'Set' is from 'dart:core'.
'BluetoothDevice' is from 'package:flutter_web_bluetooth/src/flutter_web_bluetooth_web.dart' ? _knownDevicesStream.value!

Please change the description on pub.dev for this package. Windows, Linux, MacOS, iOS and Android don't work. This is misleading for people looking for a genuine cross platform solution.

Characteristic discovery doesn't seem to work for the iOS browser. Not sure why yet.

Link to browser: https://apps.apple.com/us/app/bluefy-web-ble-browser/id1492822055

I have connected ble device using flutter_web_bluetooth library, now i trying to get ble device services but i'm getting empty list of services, here is my code, could you please tell me do i need to do some modification in this code for getting services.

connectedDevice?.discoverServices().then((services) async {
services.forEach((service) {
print("uuid - ${service.uuid}");
});
});

and I tried this also.

List? services = await connectedDevice?.discoverServices();

Thanks for your great work
Is it possible to get the signal strength of a device without pairing it ?

I've successfully managed to connect to the ble device and get its services by both calling discoverServices and services on the BluetoothDevice object.
The problem is that it only returns 3 primary services namely 1800, 1801, and 180a which are not useful to me and are for generic access, generic attributes, and device information respectively.
I'm looking for FFF0 service which holds the characteristics FFF1 and FFF2 for reading and writing data.
*Note that I've already found and worked with the FFF0 service with both the flutter_blue package for android and ios and NRF connect mobile app; meaning that the service indeed exists.
As I decided to expand my project to the web, I thought that flutter_web_bluetooth is a suitable alternative.
In short:
A service is missing from the services list. Does anyone know how to solve this problem?

/// getting bluetooth devices
await FlutterWebBluetooth.instance.requestDevice(
        RequestOptionsBuilder.acceptAllDevices(
            optionalServices: BluetoothDefaultServiceUUIDS.VALUES
                .map((e) => e.uuid)
                .toList()));

FlutterWebBluetooth.instance.devices
        .firstWhere(
            (devices) => devices.any((device) => device.name == "NAME"))
        .then((devices) async {
      /// storing the device in a custom object member of type BluetoothDevice
      Bluetooth.connectedDevice =
          devices.firstWhere((device) => device.name == "NAME");
      Bluetooth.connectedDevice.connect();
      
      /// getting services after device is connected 
      StreamSubscription subscription;
      subscription = Bluetooth.connectedDevice.connected.listen((event) async {
        print("waiting for device to be connected");
        if (event) {
          Bluetooth.connectedDevice.discoverServices().then((services) async {
            services.forEach((service) {
              print(service.uuid);
            });
          });
          subscription.cancel();
        }
      });
    });

It returns three services with uuids:
00001800-0000-1000-8000-00805F9B34FB
00001801-0000-1000-8000-00805F9B34FB
0000180a-0000-1000-8000-00805F9B34FB

But I'm looking for:
0000FFF0-0000-1000-8000-00805F9B34FB

Not every browser has implemented the window.navigator.bluetooth.getDevices call yet.
This will cause a problem to get the list of devices back that you have already paired with once.

Wrote data to a Thermal POS printer but nothing happens. Tried this same approach using other bluetooth libraries on native platforms and it works fine. I'm I missing something??

` for (var i = 0; i < data.length; i++) {

  try {
    await charac.writeValueWithResponse(data[i] as Uint8List);
  } catch (e) {
    print("web: error $e");
    return false;
 }
   }`

Manufacturer Data map is empty in advertisements, probably because to discover manufacturer data in advertisements, we have to also pass optionalManufacturerData in request filters, as mentioned here

flutter_web_bluetooth ^0.0.8 requires meta >=1.3.0 <1.8.0. And because every version of flutter_localizations from sdk depends on meta 1.8.0

Because every version of flutter_test from sdk depends on meta 1.8.0 and flutter_web_bluetooth depends on meta >=1.3.0 <1.8.0, flutter_test from sdk is incompatible with flutter_web_bluetooth

Is it possible to create bidirectional communication between a Flutter web application, using flutter_web_bluetooth lib, running on a desktop browser, and a Flutter mobile application using flutter_blue lib ?
thx

Does there exist a valueListener in Web ble for flutter to listen for changes in notifications?

example for web ble:

  function handleScaleMeasurementCharacteristic(characteristic) {
      console.log(characteristic);
      console.log("Starting notifications...");
      return characteristic.startNotifications().then((char) => {
        console.log("Adding event listener...");
        char.addEventListener(
          "oncharacteristicvaluechanged",
          onCharacteristicValueChanged
        );
      });
    }