Payload (250 bytes) too long for MTU: 249

[tonkarhu]

Problem I started to see today:

E/Uploader: Upload failed
    Payload (250 bytes) too long for MTU: 249
        at io.runtime.mcumgr.ble.McuMgrBleTransport.lambda$send$0$io-runtime-mcumgr-ble-McuMgrBleTransport(McuMgrBleTransport.java:356)
        at io.runtime.mcumgr.ble.McuMgrBleTransport$$ExternalSyntheticLambda3.onRequestCompleted(Unknown Source:13)
        at no.nordicsemi.android.ble.Request.lambda$notifySuccess$1$no-nordicsemi-android-ble-Request(Request.java:1239)
        at no.nordicsemi.android.ble.Request$$ExternalSyntheticLambda2.run(Unknown Source:4)
        at android.os.Handler.handleCallback(Handler.java:938)
        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.os.HandlerThread.run(HandlerThread.java:67)

I solved this by downgrading
no.nordicsemi.android:mcumgr-ble:1.5.0
to
no.nordicsemi.android:mcumgr-ble:1.4.1'

in my app and it works now.

My guess is that the "Ble library update":
"BLE library updated to version 2.6.0-alpha04 by @philips77" in @#84
has to do something with this issue.

[philips77]

The issue you're having is not related to BLE library.
The root cause seems to be this PR: #83

[philips77]

Could you say the offset at which you're getting this error? Is it at the beginning, or later during the upload?

[tonkarhu]

Sometimes it fails after the first transfer sometimes after multiple transfers:

I/flutter: == Percentage: 16 % ==
I/System.out: == [1670399859403] bytes sent: 64496, image size: 388603 ==
I/flutter: == onUploadProgressChanged: {bytesSent: 64496, imageSize: 388603, timestamp: 1670399859403} ==
I/flutter: == Speed: 4.827731725697061 bytes/ms ==
I/flutter: == Time left: 67134.42635489511 ms ==
I/flutter: == Percentage: 17 % ==
I/System.out: == [1670399859505] bytes sent: 64944, image size: 388603 ==
I/flutter: == onUploadProgressChanged: {bytesSent: 64944, imageSize: 388603, timestamp: 1670399859505} ==
I/flutter: == Speed: 4.824409213281483 bytes/ms ==
I/flutter: == Time left: 67087.79991319445 ms ==
I/flutter: == Percentage: 17 % ==
W/System.err: Payload (251 bytes) too long for MTU: 249
W/System.err:     at io.runtime.mcumgr.ble.McuMgrBleTransport.lambda$send$0$McuMgrBleTransport(McuMgrBleTransport.java:356)
W/System.err:     at io.runtime.mcumgr.ble.-$$Lambda$McuMgrBleTransport$G9R9yrfNM-X8bvUSG0-6o8BwsHU.onRequestCompleted(Unknown Source:13)
W/System.err:     at no.nordicsemi.android.ble.Request.lambda$notifySuccess$1$Request(Request.java:1239)
W/System.err:     at no.nordicsemi.android.ble.-$$Lambda$Request$ep6TD_94xCe5LaEafH2PrarR3yc.run(Unknown Source:4)
W/System.err:     at android.os.Handler.handleCallback(Handler.java:938)
W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:99)
W/System.err:     at android.os.Looper.loopOnce(Looper.java:226)
W/System.err:     at android.os.Looper.loop(Looper.java:313)
W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:8751)
W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
W/System.err:     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1135)
I/System.out: == Upgrade failed: Payload (251 bytes) too long for MTU: 249 ==
I/flutter: == onUpgradeFailed: {state: UPLOAD, error: Payload (251 bytes) too long for MTU: 249

[philips77]

What windowCapacity and memoryAlignment are you setting in the FirmwareUpgradeManager?

[tonkarhu]

So far, I have only tested with WindowCapacity: 4 and memoryAlignment: 1

[philips77]

Good news, I manage to replicate the issue!

[philips77]

I just released 1.5.2 with this issue fixed. Thank you for finding the bug!

[nrbrook]

I have this issue after upgrading to 2.0.1. Is there something I'm missing?

[nrbrook]

Fixed again in 2.0.2