SNAC(13,05)  CLI_SSI_CHECKOUT 

Use this snac to check if your SSI local copy up-to-date (mod-time & items-num match). If not - server will send SSI via SNAC(13,06), overwise you'll receive SNAC(13,0F).

 00 13   word   SNAC family
 00 05   word   SNAC subtype
 00 00   word   SNAC flags
 xx xx xx xx   dword   SNAC request-id
 xx xx xx xx   dword   modification date/time of client local SSI copy
 xx xx   word   number of items in client local SSI copy

Example SNAC dump with flap header:

  2A 02 33 6C 00 10 00 13  00 05 00 00 00 01 00 05 *.3l............
  3D E7 48 17 00 BB                                =.H...


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