Let Server Assign Resource

In my Smack XMPPConnection, when I log in, I would like the server to assign a resource for me. I don't want to supply my own or use the default value of "Smack". Is there a way to do this in Smack? My server definitely supports it and it's in the spec http://xmpp.org/rfcs/rfc6120.html#bind-servergen

thanks,

Dan