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Editorial Team
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Asked: 2026-06-01T07:47:12+00:00

I try to collect some information about the current state of the CWInterface(connected bssid,

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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…

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1 Answer

  1. Editorial Team

    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…
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