OPC UA Stub for test purpose|OPC UA Implementation: Stacks, Tools, and Samples|Forum|OPC Foundation

Hi All,

We have an windows service (WCF) written in C# where we are communicating dozens of OPC UA server over internet. Most time it works but I have noticed many events are lost, UI may not be updated sometimes etc.  In our WCF, we are using multiple threads for different purposes. Unfortunately, we don't have any unit or module test for our project.  I am checking if I can introduce module test, so I am looking if there is any OPC UA stub anywhere so I can try to use it to control our SW. Any help regarding this?