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I am writing an app which connects via WiFi to a proprietary device. The proprietary device acts as a WiFi access point.
When the device powers down, the WiFi connection is terminated, as I would expect.
The iPhone continues to send probe requests, looking for networks to connect to. It follows an exponential backoff algorithm for sending probes.
My problem is that eventually the intervals between the probe requests sent by the iPhone are longer than the timeout on my device, so they don't make a connection.
I am using the Reachability code and it works as I would expect.
It seems that pressing the home button will reset the backoff and send a probe request immediately. Does anyone know of a way to have my app do something similar?
Thanks for any help.
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Our conclusions are worrisome: On average, some mobile devices send probe requests as often as 55 times per hour, thus revealing their unique MAC address at high frequency. Even if a mobile device is not charging and in sleep mode, it might broadcast about 2000 probes per hour.
The interval for saving information about Probe Request and Beacon frames is specified. By default, the device saves information about the Probe Request and Beacon frames every 10 seconds.
A probe request frame normally includes the source MAC address, vendor specifics and SSID. Source MAC address and vendor specifics are explicit identifiers of wireless devices. Since SSID and the device are closely related, the SSID list in a probe request can also be regarded as a device fingerprint [27].
Instead of pinging the internet every time with Reachability, ping a host on the local network like the DNS server or the router (192.168.1.1).
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