iOS XPC Connection Invalid

[jtrexr2]

Hello,

I have a flutter app sending configurations over Bluetooth to esp32-based devices; I'm able to connect and send over multiple packets, but then once the connection completes and I return to scanning and try to connect to other devices, I get [CoreBluetooth] XPC connection invalid, and a Bluetooth state of UNSUPPORTED.

I'm able to connect, transmit, disconnect, scan, connect to another device, etc without issue on Android.

I would appreciate any help you could provide! A more full log below:

2020-11-11 21:36:51.144505-0500 Runner[26518:1919800] [CoreBluetooth] XPC connection invalid
2020-11-11 21:36:51.185549-0500 Runner[26518:1919807] flutter: Ble client created
2020-11-11 21:36:51.188484-0500 Runner[26518:1919807] [VERBOSE-2:ui_dart_state.cc(177)] Unhandled Exception: BleError (Error code: 100, ATT error code: null, iOS error code: null, Android error code: null, reason: null, internal message: null, device ID: null, service UUID: null, characteristic UUID: null, descriptor UUID: null)
#0      ScanningMixin.startDeviceScan.<anonymous closure> (package:flutter_ble_lib/src/bridge/scanning_mixin.dart:33:9)
#1      _invokeErrorHandler (dart:async/async_error.dart:16:24)
#2      _HandleErrorStream._handleError (dart:async/stream_pipe.dart:282:9)
#3      _ForwardingStreamSubscription._handleError (dart:async/stream_pipe.dart:161:13)
#4      _rootRunBinary (dart:async/zone.dart:1214:47)
#5      _CustomZone.runBinary (dart:async/zone.dart:1107:19)
#6      _CustomZone.runBinaryGuarded (dart:async/zone.dart:1013:7)
#7      _BufferingStreamSubscription._sendError.sendError (dart:async/stream_impl.dart:376:15)
#8      _BufferingStreamSubscription._sendError (dart:async/stream_impl.dart:394:16)
#9      _DelayedError.perform (dart:async/stream_impl.dart:622:14)
#10     _StreamImplEvents.handleNext (dart:async/stream_impl.dart:730:11)
#11     _PendingEvents.schedule.<anonymous closure> (dart:async/stream_impl.dart:687:7)
#12     _rootRun (dart:async/zone.dart:1182:47)
#13     _CustomZone.run (dart:async/zone.dart:1093:19)
#14     _CustomZone.runGuarded (dart:async/zone.dart:997:7)
#15     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1037:23)
#16     _rootRun (dart:async/zone.dart:1190:13)
#17     _CustomZone.run (dart:async/zone.dart:1093:19)
#18     _CustomZone.runGuarded (dart:async/zone.dart:997:7)
#19     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1037:23)
#20     _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#21     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
2020-11-11 21:36:51.189624-0500 Runner[26518:1919807] [VERBOSE-2:ui_dart_state.cc(177)] Unhandled Exception: BleError (Error code: 100, ATT error code: null, iOS error code: null, Android error code: null, reason: null, internal message: null, device ID: null, service UUID: null, characteristic UUID: null, descriptor UUID: null)
#0      ScanningMixin.startDeviceScan.<anonymous closure> (package:flutter_ble_lib/src/bridge/scanning_mixin.dart:33:9)
#1      _invokeErrorHandler (dart:async/async_error.dart:16:24)
#2      _HandleErrorStream._handleError (dart:async/stream_pipe.dart:282:9)
#3      _ForwardingStreamSubscription._handleError (dart:async/stream_pipe.dart:161:13)
#4      _rootRunBinary (dart:async/zone.dart:1214:47)
#5      _CustomZone.runBinary (dart:async/zone.dart:1107:19)
#6      _CustomZone.runBinaryGuarded (dart:async/zone.dart:1013:7)
#7      _BufferingStreamSubscription._sendError.sendError (dart:async/stream_impl.dart:376:15)
#8      _BufferingStreamSubscription._sendError (dart:async/stream_impl.dart:394:16)
#9      _DelayedError.perform (dart:async/stream_impl.dart:622:14)
#10     _StreamImplEvents.handleNext (dart:async/stream_impl.dart:730:11)
#11     _PendingEvents.schedule.<anonymous closure> (dart:async/stream_impl.dart:687:7)
#12     _rootRun (dart:async/zone.dart:1182:47)
#13     _CustomZone.run (dart:async/zone.dart:1093:19)
#14     _CustomZone.runGuarded (dart:async/zone.dart:997:7)
#15     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1037:23)
#16     _rootRun (dart:async/zone.dart:1190:13)
#17     _CustomZone.run (dart:async/zone.dart:1093:19)
#18     _CustomZone.runGuarded (dart:async/zone.dart:997:7)
#19     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1037:23)
#20     _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#21     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
2020-11-11 21:37:05.957595-0500 Runner[26518:1919807] flutter: Bluetooth state: BluetoothState.UNSUPPORTED
2020-11-11 21:37:05.958331-0500 Runner[26518:1919807] flutter: Ble client created
2020-11-11 21:37:11.948900-0500 Runner[26518:1919807] flutter: Bluetooth state: BluetoothState.UNSUPPORTED

[vimarrow]

Same issue here on iOS 13.3

On iOS 12.x it's working fine.

[vimarrow]

There is this restoreStateIdentifier argument that you can feed into createClient() method. Seems that for this lib to work on iOS 14.x this is required. It's working for me now.

https://github.com/Polidea/FlutterBleLib/blob/develop/lib/ble_manager.dart#L69

[Maarsls]

Hey, is there any solution or @andreibratuleanu21 could you please explain me further how to fix that !