OPC UA Generic Server - node "Array of Bytes" has value of type "ByteString" instead of "Array of Bytes". Is it correct? | OPC UA Implementation: Stacks, Tools, and Samples | Forum

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OPC UA Generic Server - node "Array of Bytes" has value of type "ByteString" instead of "Array of Bytes". Is it correct?

Jarosław Jasiński

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03/30/2016 - 06:25

The id of the node is "ns=2;i=10302". It's full name is "Object/Data/Static/Array/ByteValue". The type of Value attribute is ByteString not Byte[].

All other sibling nodes like "Object/Data/Static/Array/SByte" or "Object/Data/Static/Array/In16" have attribute Value of type array, respectively SByte[] and Int16[].

Does using ByteString instead of Byte[] is correct? If yes then is using Byte[] incorrect?

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03/30/2016 - 07:29

Hello,

This is a good question and fortunately has an easy answer.

In some development languages such as Java and .NET, they cannot distinguish the difference between a ByteString and Byte[] array. For those languages they're seen the same thing and therefore interpreted [typically] as ByteString.

This poses more of a problem for the other development languages that can distinguish a difference between them. I think in UA 1.02 specification a clause was added to force Servers to automatically convert ByteString-to-Byte[] and vice-versa.

So to answer your question, this behavior is OK.

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