Main.cs

public static class MyTestApp {
    private static Fleka.DotnetVcmp.Interop.PluginFunctions _pluginFunctions;

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

        pluginCallbacks.OnServerInitialize = OnServerInitialize;
    }

    internal static byte OnServerInitialize() {
        _pluginFunctions.LogMessage("%s", "Hello world");

        return 1;
    }
}