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Navideck / universal_ble

A cross-platform Android/iOS/macOS/Windows/Linux/Web Bluetooth Low Energy (BLE) plugin for Flutter
https://pub.dev/packages/universal_ble
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Calling startScan in widget's initState method throws PlatformException #27

Closed BikeBr0 closed 1 month ago

BikeBr0 commented 1 month ago

This bug is specific to running on windows in release mode (cannot reproduce in debug mode). I can reliably reproduce this in a simple hello_world app but only occurs when startScan is called in the widget's initState method. Moving startScan to a button tap does not trigger the bug.

C:\Users\me.human\workspace\hello_world>flutter run -d windows --release Launching lib\main.dart on Windows in release mode... Nuget.exe not found, trying to download or use cached version. Building Windows application... 19.4s √ Built build\windows\x64\runner\Release\hello_world.exe (0.1MB).

Flutter run key commands. h List all available interactive commands. c Clear the screen q Quit (terminate the application on the device). [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(Bluetooth is not available, , null, null)

0 UniversalBlePlatformChannel.startScan (package:universal_ble/src/universal_ble_pigeon/universal_ble.g.dart:276)

#1 UniversalBlePigeonChannel.startScan (package:universal_ble/src/universal_ble_pigeon/universal_ble_pigeon_channel.dart:35) #2 _QueuedFuture.execute (package:universal_ble/src/ble_command_queue.dart:66)
BikeBr0 commented 1 month ago

Of note, when the Exception occurs, a subsequent tap to trigger a startScan works as expected and BleScanResults are returned.

rohitsangwan01 commented 1 month ago

@BikeBr0 Like mentioned in your logs Unhandled Exception: PlatformException(Bluetooth is not available, , null, null) Make sure to start scan only after Bluetooth is initialized, for this you can use bluetooth-availability apis

BikeBr0 commented 1 month ago

Ahhh! Thank you very much @rohitsangwan01, I missed that detail (that is clearly on the readme...). So far so good when using that API. I'll continue to test this a little more before closing the ticket.

BikeBr0 commented 1 month ago

Seems to be working well for the most part. I do sometimes notice (inconsistently) that my flutter app will consider bluetooth to be off when it is in fact on. This seem so to happen most often when I run flutter in --release mode and shut the app down through the window's close button or user ctrl+c from the terminal (instead of q). I'll open a new ticket if I figure out the reproduction steps.