iOS network quality

Does anybody know if it is possible to analyze the (wifi) network quality on a iOS device? Like bars and speed.

I used the reachability project from apple, but i would like to have more infor开发者_开发问答mation then the YES/NO result the reachability returns.

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AFAIK, on the Mac there is the CoreWLAN framework, but there is no such framework (at least a public one) on iOS. It could be though that one can get low level and use some BSD calls, but I do not know that.