Hi,
Sorry I haven't used openwrt on it and for now I won't. I'm just using the default web interface to configure it and to connect to wifi in the cheapest way I've found.
I have a couple of these modules and have not found any code that makes them work.
I'm just sending strings over TCP to the module, and then with the arduino you only have to read/write through serial. What code are you trying to use? It's probably a configuration issue...does it respond to a ping at least?