openScale crash when connecting to QN-Scale

Happens with the release version as well as with the current master immediately upon connecting, app is therefore unusable:

D/BluetoothCommunication: Found peripheral 'QN-Scale'
D/BluetoothAdapter: isLeEnabled(): ON
I/BluetoothCentral: scan stopped
D/BluetoothCommunication: Try to connect to BLE device D8:0B:CB:14:6C:E7
I/BluetoothPeripheral: connect to 'QN-Scale' (D8:0B:CB:14:6C:E7) using TRANSPORT_LE
D/BluetoothGatt: connect() - device: D8:0B:CB:14:6C:E7, auto: false
D/BluetoothGatt: registerApp()
D/BluetoothGatt: registerApp() - UUID=b0174713-c339-4b9b-b0c4-1988b0dfd814
D/BluetoothGatt: onClientRegistered() - status=0 clientIf=11
D/BluetoothGatt: onClientConnectionState() - status=0 clientIf=11 device=D8:0B:CB:14:6C:E7
I/BluetoothPeripheral: connected to 'QN-Scale' (BOND_NONE) in 0,2s
D/BluetoothPeripheral: discovering services of 'QN-Scale' with delay of 0 ms
D/BluetoothGatt: discoverServices() - device: D8:0B:CB:14:6C:E7
D/BluetoothGatt: onConnectionUpdated() - Device=D8:0B:CB:14:6C:E7 interval=6 latency=0 timeout=500 status=0
D/BluetoothGatt: onSearchComplete() = Device=D8:0B:CB:14:6C:E7 Status=0
I/BluetoothPeripheral: discovered 5 services for 'QN-Scale'
D/BluetoothCommunication: connected to 'QN-Scale'
D/BluetoothCommunication: Successful Bluetooth services discovered
D/BluetoothCommunication: Resume machine state
D/BluetoothCommunication: Step Nr 0
D/BluetoothCommunication: Invoke set notification on 0xffe1
D/BluetoothCommunication: Step Nr 1
D/BluetoothCommunication: Invoke set indication on 0xffe2
D/BluetoothCommunication: Step Nr 2
D/BluetoothCommunication: Invoke write bytes [13 09 15 01 10 00 00 00 42] on 0xffe3
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.health.openscale, PID: 26816
    java.lang.NullPointerException: no valid characteristic provided
        at java.util.Objects.requireNonNull(Objects.java:245)
        at com.welie.blessed.BluetoothPeripheral.writeCharacteristic(BluetoothPeripheral.java:1182)
        at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:243)
        at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:231)
        at com.health.openscale.core.bluetooth.BluetoothQNScale.onNextStep(BluetoothQNScale.java:111)
        at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:503)
        at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:505)
        at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:505)
        at com.health.openscale.core.bluetooth.BluetoothCommunication.resumeMachineState(BluetoothCommunication.java:173)
        at com.health.openscale.core.bluetooth.BluetoothCommunication$1.onServicesDiscovered(BluetoothCommunication.java:372)
        at com.welie.blessed.BluetoothPeripheral$1$1.run(BluetoothPeripheral.java:323)
        at android.os.Handler.handleCallback(Handler.java:938)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7656)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
E/CustomActivityOnCrash: App has crashed, executing CustomActivityOnCrash's UncaughtExceptionHandler
    java.lang.NullPointerException: no valid characteristic provided
        at java.util.Objects.requireNonNull(Objects.java:245)
        at com.welie.blessed.BluetoothPeripheral.writeCharacteristic(BluetoothPeripheral.java:1182)
        at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:243)
        at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:231)
        at com.health.openscale.core.bluetooth.BluetoothQNScale.onNextStep(BluetoothQNScale.java:111)
        at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:503)
        at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:505)
        at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:505)
        at com.health.openscale.core.bluetooth.BluetoothCommunication.resumeMachineState(BluetoothCommunication.java:173)
        at com.health.openscale.core.bluetooth.BluetoothCommunication$1.onServicesDiscovered(BluetoothCommunication.java:372)
        at com.welie.blessed.BluetoothPeripheral$1$1.run(BluetoothPeripheral.java:323)
        at android.os.Handler.handleCallback(Handler.java:938)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7656)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
D/BluetoothGatt: onConnectionUpdated() - Device=D8:0B:CB:14:6C:E7 interval=36 latency=0 timeout=500 status=0
I/Process: Sending signal. PID: 26816 SIG: 9
Disconnected from the target VM, address: 'localhost:32997', transport: 'socket'

Aug 30 '21 01:08 Hoernchen

I'm working on this and I've fixed it for my scale, I just have to add a way to distinguish the scales by looking at the scale config, since there are apparently a dozen different "qn scale" models out there.

Aug 31 '21 00:08 Hoernchen

Hi. Seems I'm having the same issue. Here is the log I grabbed from the app in case it helps but not sure if this is helpful.

Build version: 2.3.2-dev_5d697fe9_2020-11-05 
Build date: 1981-01-01 01:01:02 
Current date: 2021-09-28 19:00:38 
Device: OnePlus ONEPLUS A3003 
OS version: Android 11 (SDK 30) 
 
Stack trace:  
java.lang.NullPointerException: no valid characteristic provided
	at java.util.Objects.requireNonNull(Objects.java:245)
	at com.welie.blessed.BluetoothPeripheral.writeCharacteristic(BluetoothPeripheral.java:1192)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:200)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:188)
	at com.health.openscale.core.bluetooth.BluetoothQNScale.onNextStep(BluetoothQNScale.java:111)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:460)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:462)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:462)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.resumeMachineState(BluetoothCommunication.java:173)
	at com.health.openscale.core.bluetooth.BluetoothCommunication$1.onServicesDiscovered(BluetoothCommunication.java:329)
	at com.welie.blessed.BluetoothPeripheral$1$1.run(BluetoothPeripheral.java:381)
	at android.os.Handler.handleCallback(Handler.java:938)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loop(Looper.java:223)
	at android.app.ActivityThread.main(ActivityThread.java:7664)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)

Sep 28 '21 13:09 gammerboy

The scale I'm trying to connect to is (https://github.com/oliexdev/openScale/issues/373) exactly like the one shown in that issue. But it's called Actofit smartscale Lite. It shows up as QN-Scale in the bluetooth menu and in the openscale app.

Sep 28 '21 14:09 gammerboy

please try out the latest dev version of openScale.

Oct 10 '21 09:10 oliexdev

Hi, This is the error I'm getting on the latest dev build

Build version: 2.3.2-dev_5d697fe9_2020-11-05 Build date: 1981-01-01 01:01:02 Current date: 2021-10-11 15:02:55 Device: Samsung SM-G780F OS version: Android 11 (SDK 30)

Stack trace: java.lang.IllegalArgumentException: ID does not reference a View inside this Activity at android.app.Activity.requireViewById(Activity.java:3432) at androidx.core.app.ActivityCompat.requireViewById(ActivityCompat.java:363) at androidx.navigation.Navigation.findNavController(Navigation.java:58) at com.health.openscale.gui.preferences.BluetoothSettingsFragment$BluetoothDeviceView.onClick(BluetoothSettingsFragment.java:365) at android.view.View.performClick(View.java:8160) at android.widget.TextView.performClick(TextView.java:16222) at android.view.View.performClickInternal(View.java:8137) at android.view.View.access$3700(View.java:888) at android.view.View$PerformClick.run(View.java:30236) at android.os.Handler.handleCallback(Handler.java:938) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:246) at android.app.ActivityThread.main(ActivityThread.java:8595) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)

Oct 11 '21 09:10 gammerboy

@gammerboy try out the openScale version 2.4.1

Oct 11 '21 15:10 oliexdev

Hi, Here is the log from 2.4.1. It still crashes while connecting to the scale.

Build version: 2.4.1 
Build date: 1981-01-01 01:01:02 
Current date: 2021-10-12 21:15:56 
Device: Samsung SM-G780F 
OS version: Android 11 (SDK 30) 
 
Stack trace:  
java.lang.NullPointerException: no valid characteristic provided
	at java.util.Objects.requireNonNull(Objects.java:245)
	at com.welie.blessed.BluetoothPeripheral.writeCharacteristic(BluetoothPeripheral.java:1182)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:303)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:291)
	at com.health.openscale.core.bluetooth.BluetoothQNScale.onNextStep(BluetoothQNScale.java:111)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:598)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:600)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:600)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.resumeMachineState(BluetoothCommunication.java:210)
	at com.health.openscale.core.bluetooth.BluetoothCommunication$1.onServicesDiscovered(BluetoothCommunication.java:453)
	at com.welie.blessed.BluetoothPeripheral$1$1.run(BluetoothPeripheral.java:209)
	at android.os.Handler.handleCallback(Handler.java:938)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loop(Looper.java:246)
	at android.app.ActivityThread.main(ActivityThread.java:8595)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)

Oct 12 '21 16:10 gammerboy

Crashes when connecting to QN-Scale1.

Log:

Build version: 2.4.1 Build date: 1981-01-01 01:01:02 Current date: 2021-10-16 21:22:17 Device: Google Pixel 3a XL OS version: Android 11 (SDK 30)

Stack trace:
java.lang.NullPointerException: no valid characteristic provided at java.util.Objects.requireNonNull(Objects.java:245) at com.welie.blessed.BluetoothPeripheral.writeCharacteristic(BluetoothPeripheral.java:1182) at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:303) at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:291) at com.health.openscale.core.bluetooth.BluetoothQNScale.onNextStep(BluetoothQNScale.java:111) at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:598) at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:600) at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:600) at com.health.openscale.core.bluetooth.BluetoothCommunication.resumeMachineState(BluetoothCommunication.java:210) at com.health.openscale.core.bluetooth.BluetoothCommunication$1.onServicesDiscovered(BluetoothCommunication.java:453) at com.welie.blessed.BluetoothPeripheral$1$1.run(BluetoothPeripheral.java:209) at android.os.Handler.handleCallback(Handler.java:938) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:223) at android.app.ActivityThread.main(ActivityThread.java:7664) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)

Oct 17 '21 04:10 imcan8dn

I got similar error when reading data from a Yolanda CS20E. I also tested the dev build and the same error triggered.

Build version: 2.4.5 
Build date: 1981-01-01 01:01:02 
Current date: 2022-02-14 16:52:53 
Device: Sony H8324 
OS version: Android 10 (SDK 29) 
 
Stack trace:  
java.lang.NullPointerException: no valid characteristic provided
	at java.util.Objects.requireNonNull(Objects.java:228)
	at com.welie.blessed.BluetoothPeripheral.writeCharacteristic(BluetoothPeripheral.java:1206)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:303)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:291)
	at com.health.openscale.core.bluetooth.BluetoothQNScale.onNextStep(BluetoothQNScale.java:111)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:599)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:601)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:601)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.resumeMachineState(BluetoothCommunication.java:210)
	at com.health.openscale.core.bluetooth.BluetoothCommunication$1.onServicesDiscovered(BluetoothCommunication.java:453)
	at com.welie.blessed.BluetoothPeripheral$1$1.run(BluetoothPeripheral.java:209)
	at android.os.Handler.handleCallback(Handler.java:883)
	at android.os.Handler.dispatchMessage(Handler.java:100)
	at android.os.Looper.loop(Looper.java:359)
	at android.app.ActivityThread.main(ActivityThread.java:7418)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:935)

Feb 14 '22 17:02 http403

Same error here, QN-Scale (Vont SBS01)

Build version: 2.4.6 Build date: 1981-01-01 01:01:02 Current date: 2022-08-24 18:48:30 Device: Google Pixel 6 OS version: Android 12 (SDK 32) Stack trace: java.lang.NullPointerException: no valid characteristic provided at java.util.Objects.requireNonNull(Objects.java:245) at com.welie.blessed.BluetoothPeripheral.writeCharacteristic(BluetoothPeripheral.java:1202) at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:303) at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:291) at com.health.openscale.core.bluetooth.BluetoothQNScale.onNextStep(BluetoothQNScale.java:111) at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:599) at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:601) at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:601) at com.health.openscale.core.bluetooth.BluetoothCommunication.resumeMachineState(BluetoothCommunication.java:210) at com.health.openscale.core.bluetooth.BluetoothCommunication$1.onServicesDiscovered(BluetoothCommunication.java:453) at com.welie.blessed.BluetoothPeripheral$1$1.run(BluetoothPeripheral.java:210) at android.os.Handler.handleCallback(Handler.java:938) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loopOnce(Looper.java:201) at android.os.Looper.loop(Looper.java:288) at android.app.ActivityThread.main(ActivityThread.java:7870) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)

Edit: app has all permissions including precise location - crash persists

Aug 24 '22 23:08 sethbaird01

Same issue here with scales branded Etekcity ESF24.

Build version: 2.4.6 
Build date: 1981-01-01 01:01:02 
Current date: 2022-10-28 10:50:41 
Device: Google Pixel 5 
OS version: Android 13 (SDK 33) 
 
Stack trace:  
java.lang.NullPointerException: no valid characteristic provided
 at java.util.Objects.requireNonNull(Objects.java:245)
 at com.welie.blessed.BluetoothPeripheral.writeCharacteristic(BluetoothPeripheral.java:1202)
 at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:303)
 at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:291)
 at com.health.openscale.core.bluetooth.BluetoothQNScale.onNextStep(BluetoothQNScale.java:111)
 at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:610)
 at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:612)
 at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:612)
 at com.health.openscale.core.bluetooth.BluetoothCommunication.resumeMachineState(BluetoothCommunication.java:210)
 at com.health.openscale.core.bluetooth.BluetoothCommunication$1.onServicesDiscovered(BluetoothCommunication.java:464)
 at com.welie.blessed.BluetoothPeripheral$1$1.run(BluetoothPeripheral.java:210)
 at android.os.Handler.handleCallback(Handler.java:942)
 at android.os.Handler.dispatchMessage(Handler.java:99)
 at android.os.Looper.loopOnce(Looper.java:201)
 at android.os.Looper.loop(Looper.java:288)
 at android.app.ActivityThread.main(ActivityThread.java:7898)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)

Some BLE attribute inspection in case that helps give a way to differentiate the scales:

handle: 0x0002, char properties: 0x02, char value handle: 0x0003, uuid: 00002a00-0000-1000-8000-00805f9b34fb
handle: 0x0004, char properties: 0x02, char value handle: 0x0005, uuid: 00002a01-0000-1000-8000-00805f9b34fb
handle: 0x0006, char properties: 0x02, char value handle: 0x0007, uuid: 00002a04-0000-1000-8000-00805f9b34fb
handle: 0x0009, char properties: 0x20, char value handle: 0x000a, uuid: 00002a05-0000-1000-8000-00805f9b34fb
handle: 0x000d, char properties: 0x02, char value handle: 0x000e, uuid: 00002a19-0000-1000-8000-00805f9b34fb
handle: 0x0010, char properties: 0x10, char value handle: 0x0011, uuid: 0000fff1-0000-1000-8000-00805f9b34fb
handle: 0x0013, char properties: 0x08, char value handle: 0x0014, uuid: 0000fff2-0000-1000-8000-00805f9b34fb
handle: 0x0016, char properties: 0x06, char value handle: 0x0017, uuid: 00010203-0405-0607-0809-0a0b0c0d2b12

handle: 0x0002, uuid: 00002803-0000-1000-8000-00805f9b34fb
handle: 0x0003, uuid: 00002a00-0000-1000-8000-00805f9b34fb
handle: 0x0004, uuid: 00002803-0000-1000-8000-00805f9b34fb
handle: 0x0005, uuid: 00002a01-0000-1000-8000-00805f9b34fb
handle: 0x0006, uuid: 00002803-0000-1000-8000-00805f9b34fb
handle: 0x0007, uuid: 00002a04-0000-1000-8000-00805f9b34fb
handle: 0x0008, uuid: 00002800-0000-1000-8000-00805f9b34fb
handle: 0x0009, uuid: 00002803-0000-1000-8000-00805f9b34fb
handle: 0x000a, uuid: 00002a05-0000-1000-8000-00805f9b34fb
handle: 0x000b, uuid: 00002902-0000-1000-8000-00805f9b34fb
handle: 0x000c, uuid: 00002800-0000-1000-8000-00805f9b34fb
handle: 0x000d, uuid: 00002803-0000-1000-8000-00805f9b34fb
handle: 0x000e, uuid: 00002a19-0000-1000-8000-00805f9b34fb
handle: 0x000f, uuid: 00002800-0000-1000-8000-00805f9b34fb
handle: 0x0010, uuid: 00002803-0000-1000-8000-00805f9b34fb
handle: 0x0011, uuid: 0000fff1-0000-1000-8000-00805f9b34fb
handle: 0x0012, uuid: 00002902-0000-1000-8000-00805f9b34fb
handle: 0x0013, uuid: 00002803-0000-1000-8000-00805f9b34fb
handle: 0x0014, uuid: 0000fff2-0000-1000-8000-00805f9b34fb
handle: 0x0015, uuid: 00002800-0000-1000-8000-00805f9b34fb
handle: 0x0016, uuid: 00002803-0000-1000-8000-00805f9b34fb
handle: 0x0017, uuid: 00010203-0405-0607-0809-0a0b0c0d2b12
handle: 0x0018, uuid: 00002901-0000-1000-8000-00805f9b34fb

> 0x0001 Characteristic value/descriptor: 00 18
> 0x0002 Characteristic value/descriptor: 02
> 0x0003 Characteristic value/descriptor: 51 4e 2d 53 63 61 6c 65 00 00 00 00 00 00 00 00 00 00
> 0x0004 Characteristic value/descriptor: 02
> 0x0005 Characteristic value/descriptor: 00 00
> 0x0006 Characteristic value/descriptor: 02
> 0x0007 Characteristic value/descriptor: 14 00 50 00 00 00 90 01
> 0x0008 Characteristic value/descriptor: 01 18
> 0x0009 Characteristic value/descriptor: 20
> 0x000a Characteristic value/descriptor: 00 00 00 00
> 0x000b Characteristic value/descriptor: 00 00
> 0x000c Characteristic value/descriptor: 0f 18
> 0x000d Characteristic value/descriptor: 02
> 0x000e Characteristic value/descriptor: 53
> 0x000f Characteristic value/descriptor: f0 ff
> 0x0010 Characteristic value/descriptor: 10
> 0x0011 Characteristic value/descriptor: 12 0f 15 fd 4f 26 cb 0b d8 30 05 30 00 01 bc 00 00 00 00 00
> 0x0012 Characteristic value/descriptor: 00 00
> 0x0013 Characteristic value/descriptor: 08
> 0x0015 Characteristic value/descriptor: 12 19 0d 0c 0b 0a 09 08 07 06 05 04 03 02 01 00
> 0x0016 Characteristic value/descriptor: 06
> 0x0017 Characteristic value/descriptor: 00
> 0x0018 Characteristic value/descriptor: 4f 54 41

Oct 28 '22 10:10 bjbdev

Build version: 2.4.6 
Build date: 1981-01-01 01:01:02 
Current date: 2022-12-23 07:38:40 
Device: Google Pixel 5 
OS version: Android 13 (SDK 33) 
 
Stack trace:  
java.lang.NullPointerException: no valid characteristic provided
 at java.util.Objects.requireNonNull(Objects.java:245)
 at com.welie.blessed.BluetoothPeripheral.writeCharacteristic(BluetoothPeripheral.java:1202)
 at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:303)
 at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:291)
 at com.health.openscale.core.bluetooth.BluetoothQNScale.onNextStep(BluetoothQNScale.java:111)
 at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:599)
 at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:601)
 at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:601)
 at com.health.openscale.core.bluetooth.BluetoothCommunication.resumeMachineState(BluetoothCommunication.java:210)
 at com.health.openscale.core.bluetooth.BluetoothCommunication$1.onServicesDiscovered(BluetoothCommunication.java:453)
 at com.welie.blessed.BluetoothPeripheral$1$1.run(BluetoothPeripheral.java:210)
 at android.os.Handler.handleCallback(Handler.java:942)
 at android.os.Handler.dispatchMessage(Handler.java:99)
 at android.os.Looper.loopOnce(Looper.java:201)
 at android.os.Looper.loop(Looper.java:288)
 at android.app.ActivityThread.main(ActivityThread.java:7898)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)

Renpho ES-26M-W/B

Dec 23 '22 06:12 SuperPrower

Renpho ES-CS20M is listed as a supported device yet crashes in the same way:

Build version: 2.4.6 
Build date: 1981-01-01 01:01:02 
Current date: 2023-01-15 13:41:33 
Device: Google Pixel 7 
OS version: Android 13 (SDK 33) 
 
Stack trace:  
java.lang.NullPointerException: no valid characteristic provided
	at java.util.Objects.requireNonNull(Objects.java:245)
	at com.welie.blessed.BluetoothPeripheral.writeCharacteristic(BluetoothPeripheral.java:1202)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:303)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:291)
	at com.health.openscale.core.bluetooth.BluetoothQNScale.onNextStep(BluetoothQNScale.java:111)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:599)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:601)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:601)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.resumeMachineState(BluetoothCommunication.java:210)
	at com.health.openscale.core.bluetooth.BluetoothCommunication$1.onServicesDiscovered(BluetoothCommunication.java:453)
	at com.welie.blessed.BluetoothPeripheral$1$1.run(BluetoothPeripheral.java:210)
	at android.os.Handler.handleCallback(Handler.java:942)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loopOnce(Looper.java:201)
	at android.os.Looper.loop(Looper.java:288)
	at android.app.ActivityThread.main(ActivityThread.java:7872)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)

Jan 15 '23 21:01 DuckDuckWhale

I'm working on this and I've fixed it for my scale, I just have to add a way to distinguish the scales by looking at the scale config, since there are apparently a dozen different "qn scale" models out there.

@Hoernchen how did you fixed it?

Jan 22 '23 02:01 oliexdev

Renpho ES-CS20M is listed as a supported device yet crashes in the same way:

Build version: 2.4.6 
Build date: 1981-01-01 01:01:02 
Current date: 2023-01-15 13:41:33 
Device: Google Pixel 7 
OS version: Android 13 (SDK 33) 
 
Stack trace:  
java.lang.NullPointerException: no valid characteristic provided
	at java.util.Objects.requireNonNull(Objects.java:245)
	at com.welie.blessed.BluetoothPeripheral.writeCharacteristic(BluetoothPeripheral.java:1202)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:303)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:291)
	at com.health.openscale.core.bluetooth.BluetoothQNScale.onNextStep(BluetoothQNScale.java:111)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:599)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:601)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:601)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.resumeMachineState(BluetoothCommunication.java:210)
	at com.health.openscale.core.bluetooth.BluetoothCommunication$1.onServicesDiscovered(BluetoothCommunication.java:453)
	at com.welie.blessed.BluetoothPeripheral$1$1.run(BluetoothPeripheral.java:210)
	at android.os.Handler.handleCallback(Handler.java:942)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loopOnce(Looper.java:201)
	at android.os.Looper.loop(Looper.java:288)
	at android.app.ActivityThread.main(ActivityThread.java:7872)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)

Same here

Jan 30 '23 15:01 andreaspeters

has anyone found the way? I'm also having QN-Scale but it's payload format or byte structure is unknown to me and perhaps may be different from this repo, that might be the issue. if any one know how to know the byte format please help.

Jul 17 '23 10:07 anshul-g-AnAr

I ran into the same issue on a Renpho ES-CS20M

Build version: 2.5.2 
Build date: 1981-01-01 01:01:02 
Current date: 2023-08-14 08:01:06 
Device: Samsung SM-S911B 
OS version: Android 13 (SDK 33) 
 
Stack trace:  
java.lang.NullPointerException: no valid characteristic provided
	at j$.util.Objects.requireNonNull(Unknown Source:5)
	at com.welie.blessed.BluetoothPeripheral.writeCharacteristic(BluetoothPeripheral.java:1229)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:303)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:291)
	at com.health.openscale.core.bluetooth.BluetoothQNScale.onNextStep(BluetoothQNScale.java:111)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:610)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:612)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:612)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.resumeMachineState(BluetoothCommunication.java:210)
	at com.health.openscale.core.bluetooth.BluetoothCommunication$1.onServicesDiscovered(BluetoothCommunication.java:464)
	at com.welie.blessed.BluetoothPeripheral$1$1.run(BluetoothPeripheral.java:210)
	at android.os.Handler.handleCallback(Handler.java:942)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loopOnce(Looper.java:226)
	at android.os.Looper.loop(Looper.java:313)
	at android.app.ActivityThread.main(ActivityThread.java:8757)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:604)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1067)

Aug 14 '23 06:08 g4rb4g3

Another Renpho ES-CS20M crash:

Build version: 2.5.2 
Build date: 1981-01-01 01:01:02 
Current date: 2024-06-24 18:05:19 
Device: OnePlus AC2003 
OS version: Android 11 (SDK 30) 
 
Stack trace:  
java.lang.NullPointerException: no valid characteristic provided
	at j$.util.Objects.requireNonNull(Unknown Source:5)
	at com.welie.blessed.BluetoothPeripheral.writeCharacteristic(BluetoothPeripheral.java:1229)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:303)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.writeBytes(BluetoothCommunication.java:291)
	at com.health.openscale.core.bluetooth.BluetoothQNScale.onNextStep(BluetoothQNScale.java:111)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:610)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:612)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.nextMachineStep(BluetoothCommunication.java:612)
	at com.health.openscale.core.bluetooth.BluetoothCommunication.resumeMachineState(BluetoothCommunication.java:210)
	at com.health.openscale.core.bluetooth.BluetoothCommunication$1.onServicesDiscovered(BluetoothCommunication.java:464)
	at com.welie.blessed.BluetoothPeripheral$1$1.run(BluetoothPeripheral.java:210)
	at android.os.Handler.handleCallback(Handler.java:938)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loop(Looper.java:245)
	at android.app.ActivityThread.main(ActivityThread.java:8004)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:631)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:978)

Jun 24 '24 16:06 eliasp

the error is very clear: the app is trying to write to a characteristic that the scale doesn't have. Apparently, not all QN scales have the same characteristics....

Jun 24 '24 19:06 weliem

openScale openScale copied to clipboard

crash when connecting to QN-Scale

openScale
openScale copied to clipboard