Attribute Service: What do you mean by Client physically able to specify NaN as a value ?|OPC Certification and Interoperability Testing|Forum|OPC Foundation

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Attribute Service: What do you mean by Client physically able to specify NaN as a value ?
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Dipika Khera
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04/19/2020 - 07:48
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Hi Team,

I was going through the test cases of Attribute Service where, I found one test case which says "client physically able to specify NaN as value of variable or property". Whose expected result is:

Expected Result: Client is expected to send a valid MaxAge. Note: Client may override the MaxAge with a default value. Likewise, it may simply reject the user-input and not issue the Read.

My understanding of this test case: This test case is somewhere related to a variable/property containing NaN as a value & client is trying to read that variable/property. While having this type of value we need to check how OPC client behaves ? 

Is my understanding correct or am I misunderstood something. What does Physically means here ?

Please help me in understanding this test case.

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Alexander Allmendinger
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04/22/2020 - 05:59
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Hi Dipika,

the test case asks to define a MaxAge with a "NaN" value to see how the Client behaves in this case. As the expected results are saying, the client is expected to not send a "NaN" in its request but either send a default value or declining the operation.

The word "physically" is kind of misleading and could be removed from the text. It stands for "the client allows to set a NaN value" somehow.

Regards,
Alexander Allmendinger 

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Dipika Khera
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04/23/2020 - 08:34
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Thank you Alexander for giving your time in understanding this test case to me. 🙂

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