Playerbots are programmed to respond to chat commands. The Multibot and Unbot addons are designed to handle most of the common chat commands for the player, but you may still have need for manual chat ...
Because NULL Engine is made with the Godot Game Engine, specifically Godot 4.4.1, you'll have to download that to use. Once you have Godot and NULL Engine's source code open up Godot and import NULL ...