osb/doc/lua/message.md

The message table contains a single function, setHandler, which allows entities to receive messages sent using world.sendEntityMessage. Entities which can receive messages include:

• monster
• NPC
• object
• vehicle
• stagehand
• projectile

Additionally, messages can be handled by a variety of script contexts that run on the player:

• activeitem
• quest
• playercompanions
• status

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void message.setHandler(String messageName, LuaFunction handler)

Messages of the specified message type received by this script context will call the specified function. The first two arguments passed to the handler function will be the String messageName and a bool indicating whether the message is from a local entity, followed by any arguments sent with the message.