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A couple of posts on SO including this one imply that WifiManager.startScan() only scans passively, waiting for APs to send out beacons, instead of actively sending out probe requests.

Well, I downloaded CommView for WiFi to just check this out for myself, and I find I see a probe request when I use startScan() in my app. The device is a Motorola Atrix.

CommView probe request on WifiManager.startScan()

So what am I missing?!

PVS

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    I have no idea whether WifiManager.startScan() is passive or not, but just because an answer is accepted in a question doesn't make it a fact. If you have evidence to the contrary, I recommend trusting what you see not what others have told you. I've seen plenty of wrong answers here. – Sam Jul 22 '12 at 17:37
  • May even be dependent on what power-saving profile is active.. – P Varga Jul 22 '12 at 17:40
  • I cannot find any documentation indicating whether startScan() is passive or active. This post says "looking for 802.11 APs is primarily active.": http://superuser.com/questions/128166/is-looking-for-wi-fi-access-points-purely-passive – Kaifei Dec 18 '13 at 04:30

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