communicate with console application in service fabric

Question

I've just started a PoC on service fabric for a project and I'm stuck on something that should have been straightforward but has become a real pain ...

What I need to do is host a console app returning some values in the service fabric and be able to call it on demand and get back its return value.

So I've created a simple exe looking like this, hosted in a GuestExe

    static void Main(string[] args)
    {
        Console.WriteLine("123");
        File.AppendAllText("hello.txt" + DateTime.Now.ToString(), "Hello world!");
        //Console.ReadLine();
    }

First, if the readline is commented, the explorer shows the guestExe as failing and the file is not created. If I uncomment it, the guest exe will appear as being good in the explorer, and the console app will be started on it's own (despite I didn't ask for it), the file will be created, and I won't be able to call it.

cluster image

I've tried to just hit few things in my browser : the endpoint above, http://localhost:19081/PoC9/GuestExe?cmd=instance and same without the cmd argument.

If anyone has any idea of how that should be done, please help :)