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134 bytes added ,  21:03, 30 April 2011
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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, it seems to contain unknown console unique data, since 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, it seems to contain unknown console unique data, since 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?
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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.
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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. 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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