How does rpc communication container->gadget work

[alan.castro]

> Hello guys,
> 
> I've been doing some tests with Shindig and I noticed that rpc
> communication gadget->container works fine when I put targetId as null
> in gadget.rpc.call method, but I don't know what to put in targetId to
> make a container->gadget communcation.
> 
> Container -> gadget
> 
> [Container code]
> gadgets.rpc.call(..);
> 
> [Gadget code]
> gadget.rpc.register(..);
> 
> Thank you.
> 
>