[Bug]: scan errors are not passed to scanResults stream

[timalenustmf]

Requirements

• [X] I've looked at the README 'Common Problems' section

Have you checked this problem on the example app?

No

FlutterBluePlus Version

1.29.6

Flutter Version

2.19.6

What OS?

Android

OS Version

Android 13

Bluetooth Module

/

What is your problem?

We're noticing in our crash and error reporting (Sentry) a lot of FlutterBluePlusExceptions thrown with the error code SCAN_FAILED_APPLICATION_REGISTRATION_FAILED. From the breadcrumbs it seems to have to do with a bluetooth scan still being initiated after the Android smartphone screen is turned off and our app is put into a dreaming state by the OS.

The exception seems to be thrown inside the listener on the output stream. In the file https://github.com/boskokg/flutter_blue_plus/blob/master/lib/src/flutter_blue_plus.dart on line 276.

// listen & push to `scanResults` stream
    _scanSubscription = outputStream.listen((BmScanResponse? response) {
      if (response == null) {
        // if null, this is just a periodic update to remove old results
        if (output._removeWhere((elm) => DateTime.now().difference(elm.timeStamp) > removeIfGone!)) {
          _scanResults.add(List.from(output)); // push to stream
        }
      } else {
        // failure?
        if (response.success == false) {
          throw FlutterBluePlusException(_nativeError, "scan", response.errorCode, response.errorString);
        }

Because the exception gets thrown inside the listener there is no way for our code to catch it and handle it. There should be no exception thrown here.

Logs

//logs are not relevant

[chipweinberger]

fixed 1.29.7

[timalenustmf]

fixed 1.29.7

thanks for the really quick fix