WLAN: towards a solution for the roaming freeze

Werner Almesberger werner at openmoko.org
Fri Jan 23 00:17:33 CET 2009

Andy Green wrote:
> If wpa_supplicant's automatic up and down action when it loses
> association does that and hard resets everything on the module and
> stack, it might avoid us having to do time consuming and intricate
> cartography on the completely dark firmware landscape.

Yes, but you don't always get a clear indication of trouble. E.g.,
the system may be 100% convinced we got a good association, yet no
traffic flows. Or just enough traffic to fool the heuristics of
your trouble detector (again, with the help of frequency leakage).

In any case, some cartography is unavoidable as long as the
firmware isn't living up to its promise of shielding us from all
the intricacies of wireless networking. If not of the firmware
itself then of its behaviour ...

- Werner

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