kaelima/WowPacketParser — pull request #9 by stfx (2011-10-11 14:04:48+00:00)
Title: Fix SMSG_MESSAGECHAT, CMSG_MESSAGECHAT, SMSG_TRAINER_LIST

In my sniffs from SMSG_MESSAGECHAT afk type had 8 unk bytes before textLenght value - maybe you could try it on 3.3.5 sniffs. I guess dnd would be the same. One possible explanation is that you can set the duration of /dnd like this: "/dnd*60 sixty seconds dnd mode"