[Help]: onValueReceived not called for writes

[shuizhuyu1015]

Requirements

• I've looked at the README 'Common Problems' section

FlutterBluePlus Version

1.16.10

Flutter Version

3.3.2

What OS?

Android

OS Version

Android 12

Bluetooth Module

nRF5

Ask your question

I would like to ask the response logic of onValueReceived.
Is it necessary to call "read" after each "write" command, and then "onValueReceived" will receive the message returned by the device?

onValueReceived should have received a message from my device after each write command.
But now after sending the write command several times in a row, onValueReceived may lose the messages returned by the device.

Logs

nothing

[chipweinberger]

write does not trigger the callback.

it is only called when a value is received, not sent.

yes you could call read after each write to easily get the behavior you want.

or you could create your own extension function writeExtra and your own stream onValueReceivedOrWritten and push to the stream yourself after each write.

[chipweinberger]

But I'm considering changing lastValueStream to do the behavior you want.

[shuizhuyu1015]

write does not trigger the callback.

it is only called when a value is received, not sent.

yes you could call read after each write to easily get the behavior you want.

or you could create your own extension function writeExtra and your own stream onValueReceivedOrWritten and push to the stream yourself after each write.

I did call read after write each time, but because I didn't wait for onValueReceived to respond, I writethe next instruction and read, so I didn't receive the last write and read return messages.

[chipweinberger]

Sorry, I don't understand you

but normally you should await read(), not read()

[chipweinberger]

lastValueStream now emits values when write is called. please try it on master branch!

pubspec.yaml

dependencies:
  flutter_blue_plus:
    git:
      url: https://github.com/boskokg/flutter_blue_plus
      ref: master

[shuizhuyu1015]

lastValueStream现在，当调用 write 时会发出值。请在master分支上尝试一下！

pubspec.yaml

dependencies:
  flutter_blue_plus:
    git:
      url: https://github.com/boskokg/flutter_blue_plus
      ref: master

Ok, I'll try

[shuizhuyu1015]

@chipweinberger
I tried to introduce master, but setNotifyValue timed out.

D/[FBP-Android](17473): [FBP] onMethodCall: stopScan
D/BluetoothAdapter(17473): isLeEnabled(): ON
D/BluetoothLeScanner(17473): could not find callback wrapper
D/[FBP-Android](17473): [FBP] onMethodCall: getConnectedSystemDevices
D/[FBP-Android](17473): [FBP] onMethodCall: startScan
D/BluetoothAdapter(17473): isLeEnabled(): ON
D/BluetoothLeScanner(17473): onScannerRegistered() - status=0 scannerId=8 mScannerId=0
D/[FBP-Android](17473): [FBP] onMethodCall: stopScan
D/BluetoothAdapter(17473): isLeEnabled(): ON
D/[FBP-Android](17473): [FBP] onMethodCall: connect
D/BluetoothGatt(17473): connect() - device: CF:5F:01:B9:D0:3F, auto: false
D/BluetoothGatt(17473): registerApp()
D/BluetoothGatt(17473): registerApp() - UUID=2790e058-a35c-4aab-9f53-2fcd1105f842
D/BluetoothGatt(17473): onClientRegistered() - status=0 clientIf=8
D/BluetoothGatt(17473): onClientConnectionState() - status=0 clientIf=8 device=CF:5F:01:B9:D0:3F
D/[FBP-Android](17473): [FBP] onConnectionStateChange: status: 0 (SUCCESS) newState: connected
D/[FBP-Android](17473): [FBP] onMethodCall: discoverServices
D/BluetoothGatt(17473): discoverServices() - device: CF:5F:01:B9:D0:3F
D/BluetoothGatt(17473): onConnectionUpdated() - Device=CF:5F:01:B9:D0:3F interval=6 latency=0 timeout=500 status=0
D/BluetoothGatt(17473): onSearchComplete() = Device=CF:5F:01:B9:D0:3F Status=0
D/[FBP-Android](17473): [FBP] onServicesDiscovered: count: 4 status: 0
D/[FBP-Android](17473): [FBP] onMethodCall: setNotification
D/BluetoothGatt(17473): setCharacteristicNotification() - uuid: 6e400003-b5a3-f393-e0a9-e50e24dcca9e enable: true
D/[FBP-Android](17473): [FBP] onDescriptorWrite: uuid: 00002902-0000-1000-8000-00805f9b34fb status: 0
D/BluetoothGatt(17473): onConnectionUpdated() - Device=CF:5F:01:B9:D0:3F interval=39 latency=0 timeout=500 status=0
D/BluetoothGatt(17473): onConnectionUpdated() - Device=CF:5F:01:B9:D0:3F interval=60 latency=0 timeout=400 status=0
D/[FBP-Android](17473): [FBP] onMethodCall: stopScan
D/BluetoothAdapter(17473): isLeEnabled(): ON
D/BluetoothLeScanner(17473): could not find callback wrapper
I/flutter (17473): catch error: FlutterBluePlusException: setNotifyValue: (code: 1) Timed out after 15s

[shuizhuyu1015]

Note that 1.16.12 is fine, but setNotifyValue still times out in master.

[shuizhuyu1015]

There is another problem, when I click to turn off the Bluetooth adapter, turn it on again, and start scanning and connecting, the connection times out.

D/[FBP-Android](25021): [FBP] OnAdapterStateChanged: turningOff
D/[FBP-Android](25021): [FBP] disconnectAllDevices
D/[FBP-Android](25021): [FBP] calling disconnect: CF:5F:01:B9:D0:3F
D/BluetoothGatt(25021): cancelOpen() - device: CF:5F:01:B9:D0:3F
D/[FBP-Android](25021): [FBP] calling close: CF:5F:01:B9:D0:3F
D/BluetoothGatt(25021): close()
D/BluetoothGatt(25021): unregisterApp() - mClientIf=8
D/[FBP-Android](25021): [FBP] OnAdapterStateChanged: off
D/[FBP-Android](25021): [FBP] disconnectAllDevices
D/[FBP-Android](25021): [FBP] onMethodCall: disconnect
D/[FBP-Android](25021): [FBP] already disconnected
D/BluetoothAdapter(25021): onBluetoothServiceDown
D/[FBP-Android](25021): [FBP] onMethodCall: turnOn
D/[FBP-Android](25021): [FBP] onMethodCall: getAdapterState
E/BLASTBufferQueue(25021): BLASTBufferItemConsumer::onDisconnect()
E/BLASTBufferQueue(25021): BLASTBufferItemConsumer::onDisconnect()
I/BLASTBufferQueue(25021): releaseBufferCallbackThunk bufferId:107464376713245 framenumber:1302 blastBufferQueue is dead
I/BLASTBufferQueue(25021): releaseBufferCallbackThunk bufferId:107464376713242 framenumber:1 blastBufferQueue is dead
D/BluetoothAdapter(25021): onBluetoothServiceUp: android.bluetooth.IBluetooth$Stub$Proxy@60ef773
D/[FBP-Android](25021): [FBP] OnAdapterStateChanged: turningOn
D/[FBP-Android](25021): [FBP] OnAdapterStateChanged: on
I/BufferQueueConsumer(25021): [](id:61bd00000008,api:0,p:-1,c:25021) connect: controlledByApp=false
I/BLASTBufferQueue(25021): [ViewRootImpl[MainActivity]#8] constructor()
I/BufferQueueProducer(25021): [ViewRootImpl[MainActivity]#8(BLAST Consumer)8](id:61bd00000008,api:1,p:25021,c:25021) connect: api=1 producerControlledByApp=true
I/BufferQueueConsumer(25021): [](id:61bd00000009,api:0,p:-1,c:25021) connect: controlledByApp=false
D/[FBP-Android](25021): [FBP] onMethodCall: stopScan
D/BluetoothAdapter(25021): isLeEnabled(): ON
D/BluetoothLeScanner(25021): could not find callback wrapper
D/[FBP-Android](25021): [FBP] onMethodCall: getConnectedSystemDevices
D/[FBP-Android](25021): [FBP] onMethodCall: startScan
D/BluetoothAdapter(25021): isLeEnabled(): ON
D/BluetoothLeScanner(25021): onScannerRegistered() - status=0 scannerId=8 mScannerId=0
D/[FBP-Android](25021): [FBP] onMethodCall: stopScan
D/BluetoothAdapter(25021): isLeEnabled(): ON
D/[FBP-Android](25021): [FBP] onMethodCall: connect
D/BluetoothGatt(25021): connect() - device: CF:5F:01:B9:D0:3F, auto: false
D/BluetoothGatt(25021): registerApp()
D/BluetoothGatt(25021): registerApp() - UUID=c34e5659-ca2e-4d98-9aed-32ef79b99257
D/BluetoothGatt(25021): onClientRegistered() - status=0 clientIf=8
D/[FBP-Android](25021): [FBP] onMethodCall: stopScan
D/BluetoothAdapter(25021): isLeEnabled(): ON
D/BluetoothLeScanner(25021): could not find callback wrapper
I/flutter (25021): ！！！connect error！！！: FlutterBluePlusException: connect: (code: 1) Timed out after 12s
D/[FBP-Android](25021): [FBP] onMethodCall: stopScan
D/BluetoothAdapter(25021): isLeEnabled(): ON
D/BluetoothLeScanner(25021): could not find callback wrapper
D/[FBP-Android](25021): [FBP] onMethodCall: getConnectedSystemDevices
D/[FBP-Android](25021): [FBP] onMethodCall: discoverServices
E/flutter (25021): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(discoverServices, device is disconnected, null, null)
D/BluetoothGatt(25021): onClientConnectionState() - status=133 clientIf=8 device=CF:5F:01:B9:D0:3F
D/[FBP-Android](25021): [FBP] onConnectionStateChange: status: 133 (ANDROID_SPECIFIC_ERROR) newState: disconnected
D/BluetoothGatt(25021): close()
D/BluetoothGatt(25021): unregisterApp() - mClientIf=8

[chipweinberger]

released 1.17.0

• [Breaking Change/Fix] should update lastValue & lastValueStream when write() is called

---

There is another problem, when I click to turn off the Bluetooth adapter, turn it on again, and start scanning and connecting, the connection times out.

Does this still happen on 1.17.0? please open a new issue