Bot is VERY unstable.

[Stealth]

AFAIK, it is the client's responsibility to send SID_NULL.  The packet is empty and as far as anyone can tell, the only purpose it serves is to keep a connection alive.

Real blizzard clients stopped responding to SID_NULL a long time ago.

All of them?

[Skywing]

The Blizzard clients do send SID_NULL, but the timing is not directly related to how often they receive SID_NULL.  No action is taken immediately upon receiving SID_NULL.

[DarkMinion]

That's what I meant.