I'm trying to find a way to know RTT during my android phone and the router. I'm not sure whether there is a way to find that. Dose anyone know some of this field knowledge? Thank you.
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I do not think, that there is a way to read the value from the link layer, but there is a WiFi standard 802.11mc, which includes some kind of rtt measurement.
Unfortunately, Android has only a hidden system api up to now and an app using this api has to be installed in priv-app folder which requires root.
More information can be found in this Github-project: Android RTTManagerCompat
Christopher
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