Hey,

I’m trying to make a java program that acts as a kind of middleware. It reads structures from a TwinCAT OPC UA server, puts their values into a JSON and sends it to an other server.

For testing I created in the PLC a sample struct with two variables: https://ibb.co/mmRZ9k
If I read the node, the DataValue is a ExtensionObject with binary encoding. The values of the structure variables (bVar1 and fVar2) should be read and put into a JSON object. So the result is something like this:
{
“bVar1” : false
“fVar2” : 0
}
The structure above is just an example. The structures to be read are only known at runtime.

My Problem is that I don’t know how to decode the binary ExtensionObject to get access to the values of the structure variables.