RequestSettings Timeout is ignored when calling FindServers

[mse]

Hello,

UnifiedAutomation.UaClient Version=3.2.1.0

When calling the method "Discovery.FindServers" I only pass the url, I expect by the default values of the "RequestSettings" that the method runs only after 30 seconds in timeout (RequestSettings.OperationTimeout) if the specified server is not available, but the execution is already interrupted / canceled after 13 seconds.

Is this a bug or am I possibly overlooking a parameter that is actually responsible for this?

Best regards

[Support Team]

Hello,

RequestSettings.OperationTimeout specifies a client side timeout. I.e. if the server does not send a response, the client sdk will throw a TimeoutException. However the server can send a service fault before the OperationTimeout exceeds.

Do you catch a TimeoutException or another excetion type (e.g. a StatusException)?

[mse]

Hello and thanks for the answer,

it is my intention that if a server is not reachable an exception is thrown (no matter if TimeoutException or StatusException), but only after the default 30 seconds timeout.

In my example, we assume that a server is running locally which is currently offline (so the server is not able to answer anything), here is a code from my test

using UnifiedAutomation.UaClient;

using (Discovery disc = new Discovery())
{
RequestSettings newSettings = new RequestSettings();
newSettings.OperationTimeout = 60000;
disc.DefaultRequestSettings = newSettings;
try
{
disc.FindServers("opc.tcp://127.0.0.1:48020", null, null, newSettings);
}
catch (Exception ex)
{
System.Console.WriteLine(ex.Message);
}

}

My understanding of the OperationTimeout is that in my case an exception is thrown after 60 seconds of trying to "connect".

[Support Team]

Hello,

exceptions are thrown as soon as possible.
If an error occurs before the OperationTimeout has exceeded, an exception is thrown. Otherwise a TimeoutException is thrown.