Changes

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.

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?

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 used for StreetPass is seen to change every time the user enters and exits and Settings application.

 

When there's a StreetPass hit, and no StreetPass data changed on either of the 3DSes, no data is transferred besides probes? Perhaps there's some ID in the Nintendo tag that gets updated every-time the 3DS' StreetPass data changes? After turning off power, then powering on and entering sleepmode, the MAC doesn't change from prior to power off but the last 8-bytes of the Nintendo tag changes. This tag has been seen to not be sequential over time. After one of the new StreetPass content is handled, (running one of the StreetPass titles etc) the 8bytes in the Nintendo tag changes?  

Whether to do a StreetPass hit is probably determined based on if the other 3DS MAC+8byte Nintendo tag data pair was ever seen before, or how long that 3DS was in range constantly/out of range. 3DSes that are constantly in range of each other in sleepmode, usually do StreetPass every <12 hours?

Whether to do a StreetPass hit is probably determined based on if the other 3DS MAC+8byte Nintendo tag data pair was ever seen before, or how long that 3DS was in range constantly/out of range. 3DSes that are constantly in range of each other in sleepmode, usually do StreetPass every <12 hours?

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|-

|  0x0

|  0x0

|  variable

|  varies

|  Unknown

|  Unknown, but may include active Streetpass services. This remains static between street passes, reboots, and Settings app interaction.

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|-

|  -0xa

|  -0x8

|  0xa

|  0x8

|  Some random StreetPass ID, changes after each StreetPass hit and system power-off?

|  Some random StreetPass ID, changes after each StreetPass hit and system power-off?

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