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→StreetPass Exchange
The 3DS (#1) that the Initial Probe Response is directed to will send an 802.11 Action frame back to the device. The sequence numbers at this point stop stepping up by 3, and instead increase by one based from each originating device's SN. It will then send another Probe Request, this time sent directly to the responding 3DS (#2) by specifying its MAC address in the destination field, and setting its own MAC address in the source address field. It also does not have a SSID specified in the frame, except the frame will contain a BSSID with the value of the 3DS (#2) that responded to the initial Probe, and thus acts as the master in the 802.11 exchange.
The 3DS (#1) that the Initial Probe Response is directed to will send an 802.11 Action frame back to the device. The sequence numbers at this point stop stepping up by 3, and instead increase by one based from each originating device's SN. It will then send another Probe Request, this time sent directly to the responding 3DS (#2) by specifying its MAC address in the destination field, and setting its own MAC address in the source address field. It also does not have a SSID specified in the frame, except the frame will contain a BSSID with the value of the 3DS (#2) that responded to the initial Probe, and thus acts as the master in the 802.11 exchange.
=== Send Mode ===
The 3DS can mark StreetPass data with one of 4 Send Modes
{| class="wikitable" border="1"
!ID!!Send Mode!!Description
|-
|0||EXCHANGE||StreetPass message exchange will only happen if both consoles can store the message of the other. E.g. the inbox isn't full. Example title: StreetPass Mii Plaza
|-
|1||RECV_ONLY||3DS doesn't have anything in its outbox so it is only receiving messages.
|-
|2||SEND_ONLY||
|-
|3||SEND_RECV||
|}
== StreetPass Spoofing ==
== StreetPass Spoofing ==