Server unable to decode large response about leshan

[sbernard31]

The resource 4/0/6 is defined as an integer. You try to write a string.
The log say: java.lang.IllegalArgumentException: Invalid value type, expected INTEGER, got STRING

If you want to write a string, you should choose a string resource.

[Endebert]

Sorry for the mistake. I originally encountered the error in an earlier version and just tried to do a small test with the most current version.

I've adapted the test to respond to a resource that is defined as string. While the client seems to be able to send the contents, the server seems unable to decode it:

org.eclipse.leshan.core.request.exception.ResourceAccessException: [Unable to decode tlv.] (/4/0/4:2.05)
    at org.eclipse.leshan.server.californium.impl.LwM2mResponseBuilder.decodeCoapResponse(LwM2mResponseBuilder.java:335) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.server.californium.impl.LwM2mResponseBuilder.visit(LwM2mResponseBuilder.java:115) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.request.ReadRequest.accept(ReadRequest.java:79) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.server.californium.impl.CaliforniumLwM2mRequestSender$1.buildResponse(CaliforniumLwM2mRequestSender.java:93) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.server.californium.impl.CaliforniumLwM2mRequestSender$SyncRequestObserver.onResponse(CaliforniumLwM2mRequestSender.java:319) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.coap.Request.setResponse(Request.java:416) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.server.ServerMessageDeliverer.deliverResponse(ServerMessageDeliverer.java:155) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.stack.CoapStack$StackTopAdapter.receiveResponse(CoapStack.java:193) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.stack.AbstractLayer.receiveResponse(AbstractLayer.java:98) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.stack.ObserveLayer.receiveResponse(ObserveLayer.java:138) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.stack.AbstractLayer.receiveResponse(AbstractLayer.java:98) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.stack.BlockwiseLayer.receiveResponse(BlockwiseLayer.java:453) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.stack.AbstractLayer.receiveResponse(AbstractLayer.java:98) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.stack.ReliabilityLayer.receiveResponse(ReliabilityLayer.java:257) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.stack.AbstractLayer.receiveResponse(AbstractLayer.java:98) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.stack.CoapStack.receiveResponse(CoapStack.java:135) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.CoapEndpoint$InboxImpl.receiveMessage(CoapEndpoint.java:630) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.CoapEndpoint$InboxImpl.access$700(CoapEndpoint.java:536) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.CoapEndpoint$InboxImpl$1.run(CoapEndpoint.java:548) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.CoapEndpoint$5.run(CoapEndpoint.java:695) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) ~[?:1.7.0_95]
    at java.util.concurrent.FutureTask.run(FutureTask.java:262) ~[?:1.7.0_95]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178) ~[?:1.7.0_95]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292) ~[?:1.7.0_95]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) ~[?:1.7.0_95]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) ~[?:1.7.0_95]
    at java.lang.Thread.run(Thread.java:745) [?:1.7.0_95]
Caused by: org.eclipse.leshan.core.node.codec.InvalidValueException: Unable to decode tlv.
    at org.eclipse.leshan.core.node.codec.tlv.LwM2mNodeTlvDecoder.decode(LwM2mNodeTlvDecoder.java:53) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.LwM2mNodeDecoder.decode(LwM2mNodeDecoder.java:98) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.LwM2mNodeDecoder.decode(LwM2mNodeDecoder.java:54) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.server.californium.impl.LwM2mResponseBuilder.decodeCoapResponse(LwM2mResponseBuilder.java:330) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    ... 26 more
Caused by: org.eclipse.leshan.tlv.TlvException: Impossible to parse TLV: 
9804173e705800173e6b4c796f71436941714945427361574e6c626e4e6c494546755a33567359584a4b557942324d5334314c6a414b49436f674b474d70494449774d5441744d6a41784e6942486232396e624755730a49456c75597934676148523063446f764c3246
...
5731680a64475574633268706258743261584e70596d6c73615852354f6d68705a47526c626a74394c6d356e4c57467559326876636e747762334e7064476c76626a7068596e4e76624856305a5474390a5043397a64486c735a54346e4b54733d
    at org.eclipse.leshan.tlv.TlvDecoder.decode(TlvDecoder.java:142) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.tlv.LwM2mNodeTlvDecoder.decode(LwM2mNodeTlvDecoder.java:50) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.LwM2mNodeDecoder.decode(LwM2mNodeDecoder.java:98) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.LwM2mNodeDecoder.decode(LwM2mNodeDecoder.java:54) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.server.californium.impl.LwM2mResponseBuilder.decodeCoapResponse(LwM2mResponseBuilder.java:330) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    ... 26 more
Caused by: org.eclipse.leshan.tlv.TlvException: Unexpected TLV parse error: 
9804173e705800173e6b4c796f71436941714945427361574e6c626e4e6c494546755a33567359584a4b557942324d5334314c6a414b49436f674b474d70494449774d5441744d6a41784e6942486232396e624755730a49456c75597934676148523063446f764c3246
...
5731680a64475574633268706258743261584e70596d6c73615852354f6d68705a47526c626a74394c6d356e4c57467559326876636e747762334e7064476c76626a7068596e4e76624856305a5474390a5043397a64486c735a54346e4b54733d
    at org.eclipse.leshan.tlv.TlvDecoder.decode(TlvDecoder.java:145) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.tlv.TlvDecoder.decode(TlvDecoder.java:126) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.tlv.LwM2mNodeTlvDecoder.decode(LwM2mNodeTlvDecoder.java:50) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.LwM2mNodeDecoder.decode(LwM2mNodeDecoder.java:98) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.LwM2mNodeDecoder.decode(LwM2mNodeDecoder.java:54) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.server.californium.impl.LwM2mResponseBuilder.decodeCoapResponse(LwM2mResponseBuilder.java:330) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    ... 26 more
Caused by: java.nio.BufferUnderflowException
    at java.nio.HeapByteBuffer.get(HeapByteBuffer.java:145) ~[?:1.7.0_95]
    at java.nio.ByteBuffer.get(ByteBuffer.java:694) ~[?:1.7.0_95]
    at org.eclipse.leshan.tlv.TlvDecoder.decode(TlvDecoder.java:111) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.tlv.TlvDecoder.decode(TlvDecoder.java:126) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.tlv.LwM2mNodeTlvDecoder.decode(LwM2mNodeTlvDecoder.java:50) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.LwM2mNodeDecoder.decode(LwM2mNodeDecoder.java:98) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.LwM2mNodeDecoder.decode(LwM2mNodeDecoder.java:54) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.server.californium.impl.LwM2mResponseBuilder.decodeCoapResponse(LwM2mResponseBuilder.java:330) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    ... 26 more

[sbernard31]

You choose the /4/0/4 resource which is a multiple instance resource are you sure this is what you want to do ? Why not using a single instance string resource ?
Did you use Leshan Client to encode you TLV ?

[Endebert]

@sbernard31 Sorry for the inconvenience, I think I found the reason why I've had so much trouble with this.

After testing with a custom model that only has a single instance string resource, I found the following:

If I request only the resource, i.e. /3000/0/0, it works. Changing the resource to opaque, it also works.

But if I request the instance, i.e. /3000/0, it doesn't work, independently of using a string or opaque resource.

[sbernard31]

What do you mean by "it doesn't work" ? Could you be more accurate ?
I need more input (logs, the string or opaque you try to encode, or the TLV you try to decode)

[Endebert]

OK, first the server part where I'm requesting the resource/instance.

ReadResponse response;
boolean requestResource = true;

if (requestResource) {
    response = server.send(client, new ReadRequest(3000, 0, 0));
} else {
    response = server.send(client, new ReadRequest(3000, 0));
}

if (response.getCode().equals(ResponseCode.CONTENT)) {
    response.getContent().accept(new LwM2mNodeVisitor() {
        @Override
        public void visit(LwM2mObject object) {
            LOG.debug("got object");
        }

        @Override
        public void visit(LwM2mObjectInstance instance) {
            LOG.debug("got instance");
        }

        @Override
        public void visit(LwM2mResource resource) {
            if (resource.getType().equals(ResourceModel.Type.OPAQUE)) {
                LOG.debug("TYPE IS OPAQUE");
            } else {
                LOG.debug("TYPE IS STRING");
            }
        }
    });
}

Second, the custom BaseInstanceEnabler I use for testing:

public class CustomBaseInstanceEnabler extends BaseInstanceEnabler {
    private byte[] encoded = null;
    private String veryLongString = null;

    public CustomBaseInstanceEnabler() {
        try {
            encoded = Files.readAllBytes(Paths.get("test.txt"));
            veryLongString = new String(encoded, Charset.forName("UTF-8"));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public ReadResponse read(int resourceid) {
        switch (resourceid) {
            case 0:
                //LOG.debug("sending byte array");
                //return ReadResponse.success(resourceid, encoded);
                LOG.debug("sending string");
                return ReadResponse.success(resourceid, veryLongString);
        }
        return super.read(resourceid);
    }
}

My custom model:

[
  {
    "name": "Test",
    "id": 3000,
    "instancetype": "single",
    "mandatory": true,
    "description": "test model",
    "resourcedefs": [
      {
        "id": 0,
        "name": "someName",
        "operations": "RW",
        "instancetype": "single",
        "mandatory": true,
        "type": "string",
        "range": "",
        "units": "",
        "description": ""
      }
    ]
  }
]

For testing the string response, I set the type in the model to "string" and send the veryLongString variable.
For testing the byte array response, I set the type in the model to "opaque" and send the encoded variable.

Based on requestResource, I can either request the resource or the whole instance.

As I mentioned, requesting only the resource (/3000/0/0) works, the server behaves as intended:

2016-03-30 17:24:34,981 DEBUG WellKnownServlet TYPE IS STRING

When requesting the instance, I expect a simple output of got instance, but instead I get the following:

org.eclipse.leshan.core.request.exception.ResourceAccessException: [Unable to decode tlv.] (/3000/0:2.05)
    at org.eclipse.leshan.server.californium.impl.LwM2mResponseBuilder.decodeCoapResponse(LwM2mResponseBuilder.java:335) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.server.californium.impl.LwM2mResponseBuilder.visit(LwM2mResponseBuilder.java:115) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.request.ReadRequest.accept(ReadRequest.java:79) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.server.californium.impl.CaliforniumLwM2mRequestSender$1.buildResponse(CaliforniumLwM2mRequestSender.java:93) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.server.californium.impl.CaliforniumLwM2mRequestSender$SyncRequestObserver.onResponse(CaliforniumLwM2mRequestSender.java:319) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.coap.Request.setResponse(Request.java:416) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.server.ServerMessageDeliverer.deliverResponse(ServerMessageDeliverer.java:155) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.stack.CoapStack$StackTopAdapter.receiveResponse(CoapStack.java:193) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.stack.AbstractLayer.receiveResponse(AbstractLayer.java:98) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.stack.ObserveLayer.receiveResponse(ObserveLayer.java:138) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.stack.AbstractLayer.receiveResponse(AbstractLayer.java:98) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.stack.BlockwiseLayer.receiveResponse(BlockwiseLayer.java:453) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.stack.AbstractLayer.receiveResponse(AbstractLayer.java:98) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.stack.ReliabilityLayer.receiveResponse(ReliabilityLayer.java:257) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.stack.AbstractLayer.receiveResponse(AbstractLayer.java:98) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.stack.CoapStack.receiveResponse(CoapStack.java:135) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.CoapEndpoint$InboxImpl.receiveMessage(CoapEndpoint.java:630) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.CoapEndpoint$InboxImpl.access$700(CoapEndpoint.java:536) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.CoapEndpoint$InboxImpl$1.run(CoapEndpoint.java:548) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.californium.core.network.CoapEndpoint$5.run(CoapEndpoint.java:695) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) ~[?:1.7.0_95]
    at java.util.concurrent.FutureTask.run(FutureTask.java:262) ~[?:1.7.0_95]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178) ~[?:1.7.0_95]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292) ~[?:1.7.0_95]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) ~[?:1.7.0_95]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) ~[?:1.7.0_95]
    at java.lang.Thread.run(Thread.java:745) [?:1.7.0_95]
Caused by: org.eclipse.leshan.core.node.codec.InvalidValueException: Unable to decode tlv.
    at org.eclipse.leshan.core.node.codec.tlv.LwM2mNodeTlvDecoder.decode(LwM2mNodeTlvDecoder.java:53) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.LwM2mNodeDecoder.decode(LwM2mNodeDecoder.java:98) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.LwM2mNodeDecoder.decode(LwM2mNodeDecoder.java:54) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.server.californium.impl.LwM2mResponseBuilder.decodeCoapResponse(LwM2mResponseBuilder.java:330) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    ... 26 more
Caused by: org.eclipse.leshan.tlv.TlvException: Impossible to parse TLV: 
d800173e6b4c796f71436941714945427361574e6c626e4e6c494546755a33567359584a4b557942324d5334314c6a414b49436f674b474d70494449774d5441744d6a41784e6942486232396e624755730a49456c75597934676148523063446f764c3246755a33567359584a7163793576636d634b49436f6754476c6a5a57357a5a546f6754556c55436941714c776f6f5a6e5675593352706232346f0a64326c755a4739334c43426b62324e3162575675644377676457356b5a575a70626d566b4b5342374a33567a5a53427a64484a7059
...
4335755a79316f6157526c4c5746756157316864475570653252700a6333427359586b36626d39755a5341686157317762334a30595735304f3331755a3178634f6d5a76636d31375a476c7a63477868655470696247396a617a74394c6d356e4c574675615731680a64475574633268706258743261584e70596d6c73615852354f6d68705a47526c626a74394c6d356e4c57467559326876636e747762334e7064476c76626a7068596e4e76624856305a5474390a5043397a64486c735a54346e4b54733d
    at org.eclipse.leshan.tlv.TlvDecoder.decode(TlvDecoder.java:142) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.tlv.LwM2mNodeTlvDecoder.decode(LwM2mNodeTlvDecoder.java:50) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.LwM2mNodeDecoder.decode(LwM2mNodeDecoder.java:98) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.LwM2mNodeDecoder.decode(LwM2mNodeDecoder.java:54) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.server.californium.impl.LwM2mResponseBuilder.decodeCoapResponse(LwM2mResponseBuilder.java:330) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    ... 26 more
Caused by: org.eclipse.leshan.tlv.TlvException: Unexpected TLV parse error: 
d800173e6b4c796f71436941714945427361574e6c626e4e6c494546755a33567359584a4b557942324d5334314c6a414b49436f674b474d70494449774d5441744d6a41784e6942486232396e624755730a49456c75597934676148523063446f764c3246755a33567359584a7163793576636d634b49436f6754476c6a5a57357a5a546f6754556c55436941714c776f6f5a6e5675593352706232346f0a64326c755a4739334c43426b62324e3162575675644377676457356b5a575a70626d566b4b5342374a33567a5a53427a64484a7059
...
4335755a79316f6157526c4c5746756157316864475570653252700a6333427359586b36626d39755a5341686157317762334a30595735304f3331755a3178634f6d5a76636d31375a476c7a63477868655470696247396a617a74394c6d356e4c574675615731680a64475574633268706258743261584e70596d6c73615852354f6d68705a47526c626a74394c6d356e4c57467559326876636e747762334e7064476c76626a7068596e4e76624856305a5474390a5043397a64486c735a54346e4b54733d
    at org.eclipse.leshan.tlv.TlvDecoder.decode(TlvDecoder.java:145) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.tlv.TlvDecoder.decode(TlvDecoder.java:126) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.tlv.LwM2mNodeTlvDecoder.decode(LwM2mNodeTlvDecoder.java:50) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.LwM2mNodeDecoder.decode(LwM2mNodeDecoder.java:98) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.LwM2mNodeDecoder.decode(LwM2mNodeDecoder.java:54) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.server.californium.impl.LwM2mResponseBuilder.decodeCoapResponse(LwM2mResponseBuilder.java:330) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    ... 26 more
Caused by: java.nio.BufferUnderflowException
    at java.nio.HeapByteBuffer.get(HeapByteBuffer.java:145) ~[?:1.7.0_95]
    at java.nio.ByteBuffer.get(ByteBuffer.java:694) ~[?:1.7.0_95]
    at org.eclipse.leshan.tlv.TlvDecoder.decode(TlvDecoder.java:111) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.tlv.TlvDecoder.decode(TlvDecoder.java:126) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.tlv.LwM2mNodeTlvDecoder.decode(LwM2mNodeTlvDecoder.java:50) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.LwM2mNodeDecoder.decode(LwM2mNodeDecoder.java:98) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.core.node.codec.LwM2mNodeDecoder.decode(LwM2mNodeDecoder.java:54) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    at org.eclipse.leshan.server.californium.impl.LwM2mResponseBuilder.decodeCoapResponse(LwM2mResponseBuilder.java:330) ~[rethink-lhcb-broker-0.1.0-jar-with-dependencies.jar:?]
    ... 26 more

The exception occurs independently of /3000/0/0 being string or opaque.

The contents of the file is just a huge bas64 string
test.txt

[sbernard31]

Thx a lot for details. This help a lot to identify the bug. I pushed a fix in master tell me if this fix your problem now.

[sbernard31]

@Endebert, if this fix your issue, please close this issue ;).
(Thx again for reporting this one)

[Endebert]

Yes it seems to be fixed. Can you give me an ETA when the next leshan version (0.1.11-M10) will be released?

[sbernard31]

Something like that the end of the month.

[Endebert]

Great, thank you very much for your support