I don't like damage meters and such addons at all.
Imo this communication between addons should not be possible during combat and only be used out of combat.
Like Aynatir already wrote above:
Sending a message is not possible while in combat (Protected function).
- Receiving a message is not possible while in combat (Is it really needed?)
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And if we use chat channels to communicate it would make the client disconnect because of a chat spam (message spam) if used inside combat!