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OPCFoundation / UA-.NETStandard-Samples

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Xamarin demo client for Android hangs on connect #12

Open trofimich opened 5 years ago

trofimich commented 5 years ago

I've compiled original "UA Xamarin Client" solution and tried to run it on my Android 8.1 device and found that i can't connect to OPC-UA server. Application simply hangs on connection attempt.

During debugging i found that the problem is in the file Opc.Ua.Core/Security/Certificates/DirectoryCertificateStore.cs line 613:

entry.Certificate = new X509Certificate2(file.FullName);

This line of code never finishes. I tried to comment this code, but it hangs further (also when trying to make some manipulations with certificates).

So, the sample is completely broken :-/

wsaiho commented 5 years ago

I had to overcome 2 issues before being able to connect to the OPC-UA server (ICE3-8IOL-G65L-V1D) with the Xamarin client.

  1. Access to the path "/storage/emulated/0/Opc.Ua.SampleClient.Config.xml" is denied It turns out that I need to give the app permission, so I copied and paste the CheckAppPermissions() function to MainActivity.cs. I only had to give permission once when the app runs for the first time.

  2. In SecurityPolicies.cs, there is a GetDisplayName method that get invoked. Within it, the GetFields method returns nothing. I am not sure how to solve this, but I know that the security policy is None for my OPC-UA server so I just hardcoded the return "None" for this GetDisplayName method.

Another note is that only 2 transport profiles are supported: opc.tcp:// & https://

http:// does not work for this client demo

ttmmduy commented 5 years ago

I've added CheckAppPermissions(), the previuos issue has been resolved, but then I receive a warning "cannot connect to an OPC UA server"

wsaiho commented 5 years ago

You step through the code to see if the exception happens at the same place as issue OPCFoundation/UA-.NETStandard#2 in my previous post?

ttmmduy commented 5 years ago

thanks for advice, i connected the server, but now i can not read or write the values, do you know why?

wsaiho commented 5 years ago

Can you at least see the whole browse tree and the nodes?

ttmmduy commented 5 years ago

Capture

wsaiho commented 5 years ago

It happened to me too. I can see the browse tree of my OPC-UA server but cannot read the values at each node. I am not sure why. If you manage to solve it please share how :)

leafgreen-0312 commented 3 years ago

"object reference not set to an instance of an object". I have this exception when I enter the endpoint in Xamarin Client. Can you help me about that. Thanks a lot.