Hello forum!
I’m new at programming networks with routeros and mikrotik routerboard and I’ve some suggestions to ask about a project I’m following. Sorry if my language is not perfect but I’m italian.
My target is to realize a network in which a large number of ethernet stations (about a hundred) can communicate with each other without using a wired backbone. Moreover I want that every station can communicate via wireless with a generic PDA equipped with wifi card.
To solve the first issue I’ve realized an experimental network with routerboard RB411AH and RB411. Every station is connected with the ethernet port of a rb, the ethernet port is bridged with the wireless interface of the rb and the wireless interface is configured in ap-bridge mode (or station wds mode) with dynamic wds and a fixed SSID. The network works very well and every ethernet station is recognized in the WDS network. Very good! 
I’ve encountered a big problem when I’ve tried to connect the PDAs (or laptops equipped with wifi card) to the network. They are recognized, the connection is established but they can’t communicate with the other devices in the network.
Then I’ve discovered that WDS networks are not certified by the WiFi Alliance, that WDS is not supported by many devices and that devices of different vendors may be incompatible. In particular, in the Mikrotik wiki, I’ve found that “WDS works only on prism and atheros based cards” and that in AP-bridge mode only Mikrotik-compatible devices can join the network.
Now my questions are:
-there is a way (software or hardware) to solve this incompatibility issue? I’ve thought to add another wireless card in every rb, but this choice is very expensive.
-if the answer is no, does routeros allow to create ad-hoc wireless networks (that are certified by the WiFi Alliance) instead of WDS networks? For my application a peer-to-peer network would be fine. I only don’t want to use the server-client logic.
Every suggestion is welcome!
Thanks a lot! 
