Main.cs

public static sealed class MyTestApp {
    private static PluginFunctions _pluginFunctions;

    [Fleka.DotnetVcmp.Interop.EntryPoint]
    void MyEntryPoint(PluginFunctions pluginFunctions, ref PluginCallbacks pluginCallbacks) {
        _pluginFunctions = pluginFunctions;

        pluginCallbacks.OnServerInitialize = OnServerInitialize;
    }

    byte OnServerInitialize() {
        _pluginFunctions.LogMessage("Hello world");

        return 1;
    }
}