Reliable way to get channel width from wifi scan

[Michael Gray]

Using iw scan?
We've done this in the spectrum analyser plugin in Gargoyle [1].
It's not what i would call reliable though as iw itself specifically
says not to screen scrape the data. That being said, it has worked for
several years now.

[1] - https://github.com/ericpaulbishop/gargoyle/blob/master/package/plugin-gargoyle-spectrum-analyser/files/full/www/js/spectrum_analyser.js

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