CWInterface returning no data

I try to collect some information about the current state of the CWInterface(connected bssid, available access points...) and send them periodic (every 5-10 sec) via udp to a server.

My Problem is that after some time (between 30 and 50 min in some tests with different collection/sending interval) the CWInterface stops returning data.

• [CWInterface interface] returns nil
• [CWInterface interfaceNames] returns a NSSet with 0 entries
• [[CWInterface interface] scanForNetworksWithSSID:nil &error] also returns a NSSet with 0 entries

What am I doing wrong?

I'm totaly out of ideas...

OK as I already commented my own question I changed the framework from CoreWlan to the private Apple80211.framework.

This seams to work.

My Application now runs for about one and a quater hour and scanning every few seconds.

Two negative points about using Apple80211 are:

• There is no public documentation about how to use it (I used the documentation from http://code.google.com/p/iphone-wireless/ which also works for Mac OS X)
• The scans now last about 5 seconds which is prety long but hey it works...