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Android OPC UA Server
January 5, 2017
15:13, EET
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kapsl
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Hi,
I’m currently trying to get a server running on android. Currently my biggest problem is, that I can’t get the logging running. As explained here https://www.prosysopc.com/blog/developing-opc-ua-for-android/ I included org.slf4j:log4j-over-slf4j:1.7.21 but. I get a SLF4J: Failed to load class “org.slf4j.impl.StaticLoggerBinder” and no log output in the logcat.

lg Manu

January 5, 2017
16:10, EET
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kapsl
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Ok – I did finally find out: If you additionally add
compile ‘org.slf4j:slf4j-android:1.7.21’
it works.

But now I have the next problem: A error message: org.xml.sax.SAXException: Can’t create default XMLReader; is system property org.xml.sax.driver set? seems like the normal sax parser is not working on android, but without code access I can’t change the parser initialization…

lg

January 5, 2017
16:38, EET
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Jouni Aro
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Yes, this is a known problem. Unfortunately, there is no workaround to this at the moment and the Nodeset.xml models cannot be loaded in Android. So in practice, the OPC UA Server is not available on Android.

What kind of usage do you have for running the server on Android?

January 5, 2017
16:48, EET
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kapsl
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We are currently thinking about Industry 4.0 components, and there probably every system will have an OPC UA Server. So if the smartphone should be a I4.0 component we need a server on it…

January 5, 2017
18:20, EET
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Jouni Aro
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Yes, that might be necessary. We have investigated this issue in the past, but no simple solution was identified. The Android environment is not a full Java environment and the libraries are often too different to have all functionality included.

Open JDK 9 should come with support for Android (http://openjdk.java.net/projec…..droid.html), so hopefully that will help in future – if we just get the stack and SDK to support Java 9 first 🙂

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