Hi, does anyone know how the Battle.Net flood detection works? I want to be be able to make an anti-flood system on my bot.

At a high level, the Warcraft 3 one uses a kind of banking system - you get X amount of credit each tick that you don't have a message going out.  Sending a message takes X credit base and X credit per character (the Xs aren't the same).  If you would go into the negative, Warcraft 3 stops you.