Many ranger devices (e.g. the Hokuyo UTM-30 and certain IRs) return values close to 0 as error codes. These are not distances, but rather should be handled as errors. At the VERY least, these should be ignored as distances, thus it would be nice to have a min_range field in the ranger interface. Simple enough to add that I almost did it myself, but with the current player-2.1.3 and Player-3.0 differences, I thought I'd just submit a request, and when I upgrade to Player-3.0 once its fully released, hopefully it'll be there.
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