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expanded on active WiFi probe information, although admittedly not related to StreetPass most likely.
It can be used to share Mii(s) on Mii Plaza for example. Games' StreetPass data is stored on [[SD_Filesystem|SD card]] under [[extdata]], while Mii Plaza StreetPass data is stored on NAND. Not all StreetPass data is stored on SD card: "StreetPass Management" can still be used without a SD card inserted. Wifi infrastructure with APs are used to communicate, like WMB and multi-player.
It can be used to share Mii(s) on Mii Plaza for example. Games' StreetPass data is stored on [[SD_Filesystem|SD card]] under [[extdata]], while Mii Plaza StreetPass data is stored on NAND. Not all StreetPass data is stored on SD card: "StreetPass Management" can still be used without a SD card inserted. Wifi infrastructure with APs are used to communicate, like WMB and multi-player.
StreetPass in sleepmode can work without SD card inserted. Games' Streetpass data are temporarily stored in NAND, and when the games process the StreetPass data they move that data to extdata on SD card.
StreetPass in sleepmode can work without SD card inserted. Games' Streetpass data are temporarily stored in NAND, and when the games process the StreetPass data they move that data to extdata on SD card.
== WiFi Probe Frame ==
Whenever the 3DS is woken from sleep (or turned on), and WiFi is enabled, it sends out a 802.11 Probe Request which include all saved access points, as well as to an SSID containing an arbitrary string of data, such as "ic[kSvm9s@*cYD>/~IEVj\(fGG;qDo8j". The latter probe may be related to the 3DS looking for Nintendo Zone APs. This string changes at least daily, and most likely every time it is woken up.
The MAC address used for these probes are the static MAC address found in the Settings application. Unlike the StreetPass MAC address, it will not change over time. This MAC address OUI also differs from the one used in StreetPass.
== StreetPass Probe Frame ==
== StreetPass Probe Frame ==
Using Wireshark tool with a WiFi card in monitor mode allow you to see the data used to scan for other 3DS in the range. The below is a broadcast probe request from an 3DS while in standby mode, with SSID "Nintendo_3DS_continuous_scan_000". When in "active" mode, 3DS sends probe requests with arbitrary random SSID strings, like "ic[kSvm9s@*cYD>/~IEVj\(fGG;qDo8j". This frame also contains a custom Nintendo tag, the contents of this tag from different 3ds captures don't match. Probe responses contain the same Nintendo tag data as the probe requests from the same 3DS. The MAC address used in sleepmode seems to change every time there's a streetpass hit, as well as the last 8-bytes of the Nintendo tag data? The MAC address + 8 byte ID for StreetPass is seen to change every time the user enters and exits and Settings application.
Using Wireshark tool with a WiFi card in monitor mode allow you to see the data used to scan for other 3DS in the range. The below is a broadcast probe request from an 3DS while in standby mode, with SSID "Nintendo_3DS_continuous_scan_000". This frame also contains a custom Nintendo tag, the contents of this tag from different 3ds captures don't match. Probe responses contain the same Nintendo tag data as the probe requests from the same 3DS. The MAC address used in sleepmode seems to change every time there's a streetpass hit, as well as the last 8-bytes of the Nintendo tag data? The MAC address + 8 byte ID for StreetPass is seen to change every time the user enters and exits and Settings application.
0000 00 00 1a 00 2f 48 00 00 19 7d 19 de 2a 00 00 00 ..../H...}..*...
0000 00 00 1a 00 2f 48 00 00 19 7d 19 de 2a 00 00 00 ..../H...}..*...