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Re: [milo-dev] Student writhing his thesis needing help with OPC UA milo
Could I have few questions?

1) CONFIGURATION
  • What for exactly is RequestTimeout and SessionTimeout? Is it that when I request some value over OPC UA and server will not reply in xy seconds it will fail (RequestTimeout) and when the server is disconnected for xy seconds the subscription will fail (SessionTimeout)?
2) READING AND WRITHING VALUES
  • For what I use Variant? (What is difference between DataValue and Variant) I know how to use them just if you could explain be the thought behind them
3) CONVERSION OF VARIANT TO JAVA OBJECT
  • What is doing this line "Class<?> clazz = BuiltinDataType.getBackingClass(nodeId);"
4) OBSERVER PATTERN
  • I can see you are using observer pattern for asynchronouswritten,
  • I need to read about 6 variables from PLC they will all the time has same NodeId so I am not sure if I should have 6 different callbacks in my UaOpcClient like class or I should implement Observer pattern and register my observers to this subject. Here I don’ttemperature
5) READING CUSTOM STURUCTURE (OBJECT) OVER OPC UA
  •  I haven’t
Thank you so much for your time, I am looking forward to your reply,

Jakub Znamenáček
On 5. 11. 2020 17:47 +0100, Kent Randall <point85.llc@xxxxxxxxx>, wrote:
PS. The project’s full name is “OEE-Domain”. Good luck with your thesis!

Sent from my iPhone

On Nov 5, 2020, at 8:34 AM, Jakub Znamenáček <znamenacekjakub@xxxxxxxxx> wrote:

Thank you so much I will go trough it!

Jakub Znamenáček
On 5. 11. 2020 17:32 +0100, Kent Randall <point85.llc@xxxxxxxxx>, wrote:
Hello Jakob,
I use Milo on my OEE open source project. You might want to take a look at https://github.com/Point85 source code in the Domain project. Look for the opc.ua package. I am using version 0.4.2

Sent from my iPhone

On Nov 5, 2020, at 8:20 AM, Jakub Znamenáček <znamenacekjakub@xxxxxxxxx> wrote:

Hi to all,

I am student writing my thesis and I need to create application communicating with multiple PLCs over OPC UA. I have tried to go trough all examples but I am little bit lost. Is there anyone who could help me to get everything running correctly. It would help me a lot!

Thanks for reply,

Jakub Znamenáček
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