SNAC(04,0B) client message error or data

SNAC(04,0B)

CLI_ICBM_SENDxACK

Client send this snac as reply to SNAC(04,07). Server transfer it to client without changes, but only if its format is valid. This snac also used for auto-messages (away message/busy message/chat message/etc).

First dword in msg-id cookies is actually the computer uptime in milliseconds (ie GetTickCount(), at least this is what the ICQ Lite and the other official clients I have tested uses).

00 04	word	SNAC family
00 0B	word	SNAC subtype
00 00	word	SNAC flags
xx xx xx xx	dword	SNAC request-id

xx xx xx xx xx xx xx xx	qword	msg-id cookie

xx xx	word	message channel (see table below)
xx	byte	screenname string length
xx ..	string	screenname string
00 03	word	reason code (1 - unsupported channel, 2 - busted payload, 3 - channel specific)

If channel is supported, here is channel-specific data (see references below).

Channel 1	Channel 1 data format (plain-text messages)
Channel 2	Channel 2 data format (rtf messages, rendezvous)

Example SNAC dump with flap header:


  2A 02 54 28 00 6E 00 04  00 0B 00 00 00 00 00 0B *.T(.n..........
  F3 3A C1 0C 70 18 00 00  00 02 07 36 32 31 38 38 .:..p......62188
  39 35 00 03 1B 00 07 00  00 00 00 00 00 00 00 00 95..............
  00 00 00 00 00 00 00 00  00 00 03 00 00 00 00 07 ................
  00 0E 00 07 00 00 00 00  00 00 00 00 00 00 00 00 ................
  00 E9 03 00 00 00 00 1B  00 55 73 65 72 20 69 73 .........User is
  20 63 75 72 72 65 6E 74  6C 79 20 4F 63 63 75 70  currently Occup
  69 65 64 00                                      ied.