Kotlin SDK: Connecting to access points via the GoPro compose app rarely appears to work

[MRL-00]

Component
What is the bug in?

• Compose App - Kotlin
• Specs (BLE, HTTP)

Describe the bug
Using the sample compose app from Open GoPro, trying to connect to an access point doesn't always work. If I connect to network a, it works. Then I try connect to network b and it just hangs on the "connecting" state. Then closing and reopening the app causes the connection to network a to hang.

To Reproduce
Steps to reproduce the behavior:

1. Go to compose app repository, clone and wait for gradle
2. Connect to a camera via BLE
3. Go to Connect to access point and scan for SSIDs
4. Connect to any ssid, it should work.
5. Go back to the previous screen and then repeat steps 3 and 4, this time selecting a different access point.
6. It will now just stay as "connecting to network name. It will never complete.

Expected behavior
Should be able to gracefully disconnect from one WiFi network and connect to another WiFi network.

Screenshots

Hardware

• Camera: Hero13.
• OnePlus 13

[MRL-00]

Some further logs captured

 Keep Alive finished with result ==> Success: 
2025-06-16 14:25:19.521 15989-16169 BleCommunicator         gopro.open_gopro.compose_app         E  BLE Write / Receive Notification timeout of 15s
2025-06-16 14:25:19.521 15989-16169 BleCommunicator         gopro.open_gopro.compose_app         D  5. Checking received response Set Setting Response: LED vs expected Set Setting Response: LED
2025-06-16 14:25:19.522 15989-16169 Keep Alive              gopro.open_gopro.compose_app         I  Keep Alive finished with result ==> com.gopro.open_gopro.BleError: BLE Write / Receive Notification timeout of 15s
2025-06-16 14:25:19.522 15989-16169 GoPro 7983              gopro.open_gopro.compose_app         W  Failed to send keep alive.
2025-06-16 14:25:20.796 15989-16169 Keep Alive              gopro.open_gopro.compose_app         I  Executing Keep Alive with BLE communicator
2025-06-16 14:25:20.798 15989-16041 BleCommunicator         gopro.open_gopro.compose_app         D  1. Writing to CQ_SETTINGS ==> 5b 01 42
2025-06-16 14:25:20.799 15989-16041 Kable/Peripheral        gopro.open_gopro.compose_app         D  FE:8B:9C:3A:17:FC write
                                                                                                    service: 0000fea6-0000-1000-8000-00805f9b34fb
                                                                                                    characteristic: b5f90074-aa8d-11e3-9046-0002a5d5c51b
                                                                                                    writeType: WithResponse
                                                                                                    data: 20 03 5B 01 42
2025-06-16 14:25:20.820 15989-16157 Kable/Callback          gopro.open_gopro.compose_app         D  FE:8B:9C:3A:17:FC onCharacteristicWrite
                                                                                                    service: 0000fea6-0000-1000-8000-00805f9b34fb
                                                                                                    characteristic: b5f90074-aa8d-11e3-9046-0002a5d5c51b
                                                                                                    status: GATT_SUCCESS(0)
2025-06-16 14:25:20.821 15989-16041 BleCommunicator         gopro.open_gopro.compose_app         D  2. Waiting to receive response Set Setting Response: LED
2025-06-16 14:25:20.859 15989-16157 Kable/Callback          gopro.open_gopro.compose_app         D  FE:8B:9C:3A:17:FC onCharacteristicChanged
                                                                                                    service: 0000fea6-0000-1000-8000-00805f9b34fb
                                                                                                    characteristic: b5f90075-aa8d-11e3-9046-0002a5d5c51b
                                                                                                    data: 02 5B 00
2025-06-16 14:25:20.861 15989-16041 KableDevice             gopro.open_gopro.compose_app         D  Received notification 02 5b 00 on b5f90075-aa8d-11e3-9046-0002a5d5c51b
2025-06-16 14:25:20.863 15989-16161 BleCommunicator         gopro.open_gopro.compose_app         D  3. Received notification on CQ_SETTINGS_RESP: 02 5b 00
2025-06-16 14:25:20.863 15989-16161 BleCommunicator         gopro.open_gopro.compose_app         D  4. Emitting accumulated response Set Setting Response: LED
2025-06-16 14:25:20.865 15989-16038 BleCommunicator         gopro.open_gopro.compose_app         D  5. Checking received response Set Setting Response: LED vs expected Set Setting Response: LED
2025-06-16 14:25:20.867 15989-16169 BleCommunicator         gopro.open_gopro.compose_app         D  6. Returning accumulated response Set Setting Response: LED
2025-06-16 14:25:20.868 15989-16169 Keep Alive              gopro.open_gopro.compose_app         I  Keep Alive finished with result ==> Success: 
2025-06-16 14:25:22.523 15989-16169 Keep Alive              gopro.open_gopro.compose_app         I  Executing Keep Alive with BLE communicator
2025-06-16 14:25:22.525 15989-16160 BleCommunicator         gopro.open_gopro.compose_app         D  1. Writing to CQ_SETTINGS ==> 5b 01 42
2025-06-16 14:25:22.525 15989-16160 Kable/Peripheral        gopro.open_gopro.compose_app         D  CB:AD:33:15:0E:70 write
                                                                                                    service: 0000fea6-0000-1000-8000-00805f9b34fb
                                                                                                    characteristic: b5f90074-aa8d-11e3-9046-0002a5d5c51b
                                                                                                    writeType: WithResponse
                                                                                                    data: 20 03 5B 01 42
2025-06-16 14:25:23.308 15989-16628 Kable/Callback          gopro.open_gopro.compose_app         D  CB:AD:33:15:0E:70 onCharacteristicWrite
                                                                                                    service: 0000fea6-0000-1000-8000-00805f9b34fb
                                                                                                    characteristic: b5f90074-aa8d-11e3-9046-0002a5d5c51b
                                                                                                    status: GATT_ERROR(133)
2025-06-16 14:25:23.308 15989-16835 Kable/Callback          gopro.open_gopro.compose_app         D  CB:AD:33:15:0E:70 onDescriptorWrite
                                                                                                    service: 0000fea6-0000-1000-8000-00805f9b34fb
                                                                                                    characteristic: b5f90077-aa8d-11e3-9046-0002a5d5c51b
                                                                                                    descriptor: 00002902-0000-1000-8000-00805f9b34fb
                                                                                                    status: GATT_ERROR(133)
2025-06-16 14:25:23.311 15989-16169 KableDevice             gopro.open_gopro.compose_app         E  com.juul.kable.GattStatusException: OnDescriptorWrite(descriptor=00002902-0000-1000-8000-00805f9b34fb, status=GATT_ERROR(133))
2025-06-16 14:25:23.313 15989-16282 BluetoothGatt           gopro.open_gopro.compose_app         D  onClientConnectionState() - status=8 clientIf=15 connected=false device=CB:AD:33:15:0E:70
2025-06-16 14:25:23.315 15989-16282 BluetoothGatt           gopro.open_gopro.compose_app         D  onClientConnectionState() - status=8 clientIf=17 connected=false device=CB:AD:33:15:0E:70
2025-06-16 14:25:23.316 15989-16305 Kable/Callback          gopro.open_gopro.compose_app         D  CB:AD:33:15:0E:70 onConnectionStateChange
                                                                                                    status: 8
                                                                                                    newState: Disconnected
2025-06-16 14:25:23.317 15989-16305 BluetoothGatt           gopro.open_gopro.compose_app         D  close()
2025-06-16 14:25:23.317 15989-16305 BluetoothGatt           gopro.open_gopro.compose_app         D  unregisterApp() - mClientIf=17
2025-06-16 14:25:23.319 15989-16160 Kable/Peripheral        gopro.open_gopro.compose_app         D  CB:AD:33:15:0E:70 Disconnect detected
                                                                                                    state: Disconnected(Timeout)
2025-06-16 14:25:23.319 15989-16165 GoProFactory            gopro.open_gopro.compose_app         D  Propagating BLE Disconnect from GoPro CB:AD:33:15:0E:70
2025-06-16 14:25:23.320 15989-16038 KableBle                gopro.open_gopro.compose_app         D  Device CB:AD:33:15:0E:70 state change: Disconnected(Timeout)
2025-06-16 14:25:23.326 15989-16282 BluetoothGatt           gopro.open_gopro.compose_app         D  onClientConnectionState() - status=8 clientIf=19 connected=false device=CB:AD:33:15:0E:70
2025-06-16 14:25:23.327 15989-16628 Kable/Callback          gopro.open_gopro.compose_app         D  CB:AD:33:15:0E:70 onConnectionStateChange
                                                                                                    status: 8
                                                                                                    newState: Disconnected
2025-06-16 14:25:23.327 15989-16628 BluetoothGatt           gopro.open_gopro.compose_app         D  close()
2025-06-16 14:25:23.327 15989-16628 BluetoothGatt           gopro.open_gopro.compose_app         D  unregisterApp() - mClientIf=19
2025-06-16 14:25:23.328 15989-16167 Kable/Peripheral        gopro.open_gopro.compose_app         D  CB:AD:33:15:0E:70 Disconnect detected
                                                                                                    state: Disconnected(Timeout)
2025-06-16 14:25:23.328 15989-16282 BluetoothGatt           gopro.open_gopro.compose_app         D  onClientConnectionState() - status=8 clientIf=20 connected=false device=CB:AD:33:15:0E:70
2025-06-16 14:25:23.328 15989-16163 GoProFactory            gopro.open_gopro.compose_app         D  Propagating BLE Disconnect from GoPro CB:AD:33:15:0E:70
2025-06-16 14:25:23.328 15989-16041 KableBle                gopro.open_gopro.compose_app         D  Device CB:AD:33:15:0E:70 state change: Disconnected(Timeout)
2025-06-16 14:25:23.329 15989-16835 Kable/Callback          gopro.open_gopro.compose_app         D  CB:AD:33:15:0E:70 onConnectionStateChange
                                                                                                    status: 8
                                                                                                    newState: Disconnected
2025-06-16 14:25:23.329 15989-16835 BluetoothGatt           gopro.open_gopro.compose_app         D  close()
2025-06-16 14:25:23.329 15989-16835 BluetoothGatt           gopro.open_gopro.compose_app         D  unregisterApp() - mClientIf=20
2025-06-16 14:25:23.331 15989-16167 Kable/Peripheral        gopro.open_gopro.compose_app         D  CB:AD:33:15:0E:70 Disconnect detected
                                                                                                    state: Disconnected(Timeout)
2025-06-16 14:25:23.332 15989-16038 GoProFactory            gopro.open_gopro.compose_app         D  Propagating BLE Disconnect from GoPro CB:AD:33:15:0E:70
2025-06-16 14:25:23.332 15989-16162 KableBle                gopro.open_gopro.compose_app         D  Device CB:AD:33:15:0E:70 state change: Disconnected(Timeout)
2025-06-16 14:25:23.332 15989-16165 Kable/Observation       gopro.open_gopro.compose_app         V  CB:AD:33:15:0E:70 Suppressed failure: com.juul.kable.ConnectionLostException
2025-06-16 14:25:23.335 15989-16162 Kable/Observation       gopro.open_gopro.compose_app         V  CB:AD:33:15:0E:70 Suppressed failure: com.juul.kable.GattWriteException: Write failed: ProfileServiceNotBound
2025-06-16 14:25:23.337 15989-16168 Kable/Observation       gopro.open_gopro.compose_app         V  CB:AD:33:15:0E:70 Suppressed failure: com.juul.kable.GattWriteException: Write failed: ProfileServiceNotBound
2025-06-16 14:25:23.369 15989-15989 BleCommunicator         gopro.open_gopro.compose_app         E  Unexpected failure in BLE Write Char Receive Notification
2025-06-16 14:25:23.369 15989-15989 BleCommunicator         gopro.open_gopro.compose_app         D  5. Checking received response Protobuf Response: NETWORK_MANAGEMENT::SCAN_WIFI_NETWORKS_RSP vs expected Protobuf Response: NETWORK_MANAGEMENT::SCAN_WIFI_NETWORKS_RSP
2025-06-16 14:25:23.369 15989-15989 Scan for Access Points  gopro.open_gopro.compose_app         I  Scan for Access Points finished with result ==> com.gopro.open_gopro.BleError: Unexpected failure in BLE Write Char Receive Notification
2025-06-16 14:25:23.370 15989-16168 BleCommunicator         gopro.open_gopro.compose_app         E  Unexpected failure in BLE Write Char Receive Notification
2025-06-16 14:25:23.370 15989-16168 BleCommunicator         gopro.open_gopro.compose_app         D  5. Checking received response Set Setting Response: LED vs expected Set Setting Response: LED
2025-06-16 14:25:23.371 15989-16168 Keep Alive              gopro.open_gopro.compose_app         I  Keep Alive finished with result ==> com.gopro.open_gopro.BleError: Unexpected failure in BLE Write Char Receive Notification
2025-06-16 14:25:23.371 15989-16168 GoPro 7983              gopro.open_gopro.compose_app         W  Failed to send keep alive.
2025-06-16 14:25:23.410 15989-15989 AndroidRuntime          gopro.open_gopro.compose_app         E  FATAL EXCEPTION: main (Ask Gemini)
                                                                                                    Process: gopro.open_gopro.compose_app, PID: 15989
                                                                                                    com.gopro.open_gopro.BleError: Unexpected failure in BLE Write Char Receive Notification
                                                                                                    	at com.gopro.open_gopro.domain.communicator.BleCommunicator$writeCharacteristicReceiveNotification$3.invokeSuspend(BleCommunicator.kt:182)
                                                                                                    	at com.gopro.open_gopro.domain.communicator.BleCommunicator$writeCharacteristicReceiveNotification$3.invoke(Unknown Source:15)
                                                                                                    	at com.gopro.open_gopro.domain.communicator.BleCommunicator$writeCharacteristicReceiveNotification$3.invoke(Unknown Source:6)
                                                                                                    	at kotlinx.coroutines.flow.FlowKt__ErrorsKt$catch$$inlined$unsafeFlow$1.collect(SafeCollector.common.kt:110)
                                                                                                    	at kotlinx.coroutines.flow.FlowKt__ErrorsKt$catch$$inlined$unsafeFlow$1$1.invokeSuspend(Unknown Source:15)
                                                                                                    	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
                                                                                                    	at kotlinx.coroutines.internal.DispatchedContinuationKt.resumeCancellableWith(DispatchedContinuation.kt:375)
                                                                                                    	at kotlinx.coroutines.internal.ScopeCoroutine.afterCompletion(Scopes.kt:23)
                                                                                                    	at kotlinx.coroutines.JobSupport.continueCompleting(JobSupport.kt:987)
                                                                                                    	at kotlinx.coroutines.JobSupport.access$continueCompleting(JobSupport.kt:22)
                                                                                                    	at kotlinx.coroutines.JobSupport$ChildCompletion.invoke(JobSupport.kt:1268)
                                                                                                    	at kotlinx.coroutines.JobSupport.notifyCompletion(JobSupport.kt:1625)
                                                                                                    	at kotlinx.coroutines.JobSupport.completeStateFinalization(JobSupport.kt:316)
                                                                                                    	at kotlinx.coroutines.JobSupport.finalizeFinishingState(JobSupport.kt:233)
                                                                                                    	at kotlinx.coroutines.JobSupport.tryMakeCompletingSlowPath(JobSupport.kt:946)
                                                                                                    	at kotlinx.coroutines.JobSupport.tryMakeCompleting(JobSupport.kt:894)
                                                                                                    	at kotlinx.coroutines.JobSupport.makeCompletingOnce$kotlinx_coroutines_core(JobSupport.kt:859)
                                                                                                    	at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:99)
                                                                                                    	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:46)
                                                                                                    	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:98)
                                                                                                    	at android.os.Handler.handleCallback(Handler.java:959)
                                                                                                    	at android.os.Handler.dispatchMessage(Handler.java:100)
                                                                                                    	at android.os.Looper.loopOnce(Looper.java:282)
                                                                                                    	at android.os.Looper.loop(Looper.java:387)
                                                                                                    	at android.app.ActivityThread.main(ActivityThread.java:9494)
                                                                                                    	at java.lang.reflect.Method.invoke(Native Method)
                                                                                                    	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:600)
                                                                                                    	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1005)
                                                                                                    	Suppressed: kotlinx.coroutines.internal.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelling}@f04940b, Dispatchers.Main.immediate]
2025-06-16 14:25:23.425 15989-15989 Process                 gopro.open_gopro.compose_app         I  Sending signal. PID: 15989 SIG: 9

[tcamise-gpsw]

Based on the log it seems the camera is crashing or at least losing BLE connection. I'll see if I can reproduce this.

[MRL-00]

Thanks @tcamise-gpsw. In terms of replicating this, the easiest way is to join a network, disconnect, then join a different network. That seems to cause it for me.

[tcamise-gpsw]

The error from the log might actually be a separate problem. I've seen similar errors like that when camera's BLE stack just crashes.

Anyway I was easily able to reproduce the hang-when-connecting-to-multiple-access-points. At least one problem here is that a connection to an-already connected AP will infinitely hang. I've solved this in the PR linked here by:

• updating the (now stateful) AP Feature to fail to attempt connecting when an AP is already connected
• adding a new disconnect operation to the AP feature to allow disconnecting from a connected AP
• adding a fail safe in the AP Feature for the case where we connected to the camera after it was already connected to an AP
  • this will, on a failed AP connection, disconnect, and then retry connecting
  • this is needed because unfortunately there is no way to query the camera's AP state

I've also updated the demo app to play nicely with this. You should get helpful snackbar updates when you attempt to do something wrong, i.e. connect when already connected.

If you want to test this, you can try the branch from the linked PR. I still need to do some regression testing before merging.

[MRL-00]

Cheers @tcamise-gpsw. Is this just a change in the Kotlin SDK or will this require some firmware updates to the GoPro device as well? We're not specifically using the Kotlin SDK but have had similar results from our codebase as what was being displayed in the demo app.

[tcamise-gpsw]

it's just in the SDK. Basically you need to ensure you disconnect before connecting to a new network.

The disconnect command is really just disabling station mode: https://gopro.github.io/OpenGoPro/ble/features/access_points.html#disconnect-from-access-point

[MRL-00]

Thanks. We'll do some testing on our end and will report back.