How to Catch Exception with RequestFailedException

[jianhaozh]

here is my code :

        setNotificationCallback(notifyCharacteristic)
            .with { _, data ->
                val bytes = data.value!!
                val msg  = String(bytes, Charsets.UTF_8)
                onNotify(msg)
            }

        enableNotifications(notifyCharacteristic)
            .fail { device, status ->
                Log.e(TAG,"enableNotifications  error:${device.name} $status")
            }
            .invalid(invalidRequestCallback)
            .enqueue()

and sometimes get the below Exception:

no.nordicsemi.android.ble.exception.RequestFailedException: Request failed with status 133
   at no.nordicsemi.android.ble.ktx.RequestSuspendKt$suspendCancellable$2$3.onRequestFailed(RequestSuspend.kt:400)
   at no.nordicsemi.android.ble.Request.lambda$notifyFail$2(Request.java:1266)
   at no.nordicsemi.android.ble.Request.$r8$lambda$I1BgyUZ88NPGZf10e7tUAZC8w_Q(Unknown Source:0)
   at no.nordicsemi.android.ble.Request$$ExternalSyntheticLambda0.run(Unknown Source:6)
   at no.nordicsemi.android.ble.Request$1.post(Request.java:172)
   at no.nordicsemi.android.ble.Request.notifyFail(Request.java:1263)
   at no.nordicsemi.android.ble.TimeoutableRequest.notifyFail(TimeoutableRequest.java:253)
   at no.nordicsemi.android.ble.BleManagerHandler$4.onConnectionStateChange(BleManagerHandler.java:2227)
   at android.bluetooth.BluetoothGatt$1$4.run(BluetoothGatt.java:266)
   at android.os.Handler.handleCallback(Handler.java:907)
   at android.os.Handler.dispatchMessage(Handler.java:105)
   at android.os.Looper.loop(Looper.java:216)
   at android.app.ActivityThread.main(ActivityThread.java:7625)
   at java.lang.reflect.Method.invoke(Native Method)
   at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987)
   Suppressed: kotlinx.coroutines.internal.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelling}@e2d3859, Dispatchers.Default]

I have tried to add the FailCallback above，but failed, this exception leads to my app crash and exit.... how to solve it Any suggestion or comment will be greatly thankful!

[philips77]

The exception is thrown from a .suspend() method, not the code given above. When you use .enqueue(), the same exception is sent to .fail(...) method, but with .suspend() it's just thrown so you need to catch it.