Android : How to implement SignalR server methods in Client without Hub

im trying to set up an Android Application. Therefore i need to connect to a server which implemented SignalR. It seems that i can establish the Connection. The Server is not using Hubs. I know the signatures of the methods that shall be called in my client but i dont know how to implement them. When im looking at samples everyone establishes a Connection to a Hub and then subscribe to his proxy. Something like the following for example:

    hub = connection.createHubProxy("myHub");
        hub.subscribe(MainActivity.this);

hub.on("addChatMessage", new SubscriptionHandler() {

    @Override
    public void run() {
        // TODO Auto-generated method stub
        System.out.println("test");
    }
});

So my question is how am i supposed to implement those methods that the server could call when i just have a connection to the server but not to a specific hub?

im very new to this and hopefully i could explain my problem well enough ;)

thanks in advance