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edits
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→DSi System Transfer
The DSi sends a list of owned titles to the 3DS. The 3DS then seems to query the shop server via SOAP to check which titles may be transferred, it then replies to the DSi with a list of titles(of the titles which were sent to it) that can be transferred. When the user selects which title to transfer, DSi sends the banner of that title to the 3DS and many frames later the titleID.
The DSi sends a list of owned titles to the 3DS. The 3DS then seems to query the shop server via SOAP to check which titles may be transferred, it then replies to the DSi with a list of titles(of the titles which were sent to it) that can be transferred. When the user selects which title to transfer, DSi sends the banner of that title to the 3DS and many frames later the titleID.
When the DSi transfer tool and 3DS transfer tool startup, the DSi sends HTTPS SOAP requests to ecs.t.nintendowifi.net, ias.t.nintendowifi.net, and cas.t.nintendowifi.net. The 3DS sends HTTPS (mostly SOAP, unknown why the first one is used) requests to nus.c.nintendowifi.net, ecs.c.nintendowifi.net, and cas.c.nintendowifi.net. When entering the transfer DSiWare list menu, DSi requests from ecs* and cas*, 3DS does likewise.
When the DSi transfer tool and 3DS transfer tool startup, the DSi sends HTTPS SOAP requests to ecs.t.nintendowifi.net, ias.t.nintendowifi.net, and cas.t.nintendowifi.net. The 3DS sends HTTPS (mostly SOAP, unknown why the first one is used) requests to nus.c.nintendowifi.net, ecs.c.nintendowifi.net, and cas.c.nintendowifi.net. When entering the transfer DSiWare list menu, DSi requests from ecs* and cas*, 3DS does likewise. The 3DS system transfer will not allow you(likely server-side or so) to transfer etc at all unless you have the latest system update.
When DSi sends the title list, after the first 6 bytes of the 802.11 data payload, is the below header. Following the header is the list of titles.
When DSi sends the title list, after the first 6 bytes of the 802.11 data payload, is the below header. Following the header is the list of titles.