public RpcConnection getRpcConnection( HostedConnection hc ) {
        return hc.getAttribute(ATTRIBUTE_NAME);
    }
Retrieves the RpcConnection for the specified HostedConnection
 if that HostedConnection has had RPC services started using
 startHostingOnConnection() (or via autohosting).  Returns null
 if the connection currently doesn't have RPC hosting services
 attached.
jme3-networking/src/main/java/com/jme3/network/service/rpc/RpcHostedService.java