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Apps How to get the WiFi noise level in Android?

I want to implement an app which measures the quality of the WiFi signal from an indoor environment. From my research I found that the best way to get an accurate measurement is not to get only the RSSI but instead to use the SNR (Signal to Noise Ratio).

How can I obtain the noise level from the Android SDK? As I heard, there is no API available for this. However, I've found a method which provides the SNR (getEvdoSnr()). Unfortunately, this one works only for a GSM/CDMA signal and not for a WiFi connection.

Is anything possible to calculate the SNR in Android? I believe that's doable because I've found an app on Play store (called WiFi SNR) which successfully measures this ratio.


NOTE: The Android ScanResult doesn't provide the noise level, even if it's specified in the official documentation:
Describes information about a detected access point. In addition to the attributes described here, the supplicant keeps track of quality, noise, and maxbitrate attributes, but does not currently report them to external clients.
 
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Yes I saw that. Obviously technically possible then, but what I meant was that there's no interface on the Android SDK. It's probably accessible via some low level O/S interface, using a native API, but sorry, I have no idea where to look for this.
 
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