Decode extension object in Android application

[sergeishugaev]

Hello!

I am writing an application using the Milo library for Android.
I need to get an array of structures from the PLC.
I have written two programs: the first program is a simple Java program, the second is a similar java program for Android.
The first program works successfully, the second throws an exception at the decoding stage of the Extension Object.
Object object = extensionObject.decode(opcUaClient.getDynamicSerializationContext());
Exception:
org.eclipse.milo.opcua.stack.core.UaSerializationException: no codec registered for encodingId=NodeId{ns=4, id=|enc|SPK107 (M01).Application.SHIPMENT_AUTO}

Please tell me the direction of finding a solution to this problem.

Perhaps the Android application needs some additional permissions. Tell me, when decoding, what resources does the milo library use?

Thanks!

[sergeishugaev]

UAExpert

[kevinherron]

It sounds like reading the DataType dictionary failed. Maybe there was an error message?

[Unchakable]

I also faced this problem. If I understood correctly, BsdParser uses the awt package, but it is not in the sdk. There is no way to add it. Is there any way to do without BsdParser when developing mobile applications for android?

Rejecting re-init on previously-failed class java.lang.Class<com.sun.xml.bind.v2.model.impl.RuntimeBuiltinLeafInfoImpl>: java.lang.NoClassDefFoundError: Failed resolution of: Ljava/awt/Image;

at org.eclipse.milo.opcua.binaryschema.parser.DictionaryDescription org.eclipse.milo.opcua.binaryschema.parser.BsdParser.parse(java.io.InputStream) (BsdParser.java:40)

[sergeishugaev]

I probably put it wrong. The Android application does not receive dictionaries, and therefore codecs. As I understand it, dictionaries and codecs are received when executing opcUaClient.connect().get().
The java app:

The same android app:

I would like to get the dictionary from the plc and not define the custom data type.

[kevinherron]

You need that line I mentioned above that reads the datatype dictionary. If you already have that and still have no dictionaries, there is some error you need to track down.

[sergeishugaev]

How do I get the dictionaries again, after opcUaClient.connect().get(), is there any method?
How can I track down the error, give me some advice.

[kevinherron]

@Unchakable is reporting there is some error due to a missing awt package that prevents this from working.

Rejecting re-init on previously-failed class java.lang.Class<com.sun.xml.bind.v2.model.impl.RuntimeBuiltinLeafInfoImpl>: java.lang.NoClassDefFoundError: Failed resolution of: Ljava/awt/Image;

at org.eclipse.milo.opcua.binaryschema.parser.DictionaryDescription org.eclipse.milo.opcua.binaryschema.parser.BsdParser.parse(java.io.InputStream) (BsdParser.java:40)

[kevinherron]

DataTypeDictionaryReader has a logger that logs warnings, and would log additional useful information if you set it to DEBUG level.

I don't know how this is done on Android, or even where your log output goes to.

[kevinherron]

From what I can gather via Googlin', JAXB is not supported on Android, and JAXB is required for reading the DataType Dictionary, so you won't be able to use 0.6.x on Android if you need to read custom types.

In the dev/1.0 branch you can rely on the DataTypeDefinition attribute instead, which doesn't use XML/JAXB at all. If there are other Android problems lurking you'll have to find and report them, preferably in a new discussion.