Putting ((EDDI message received)) as the command name doesn't fire the command when I get a message in game. I thought maybe I wasn't using it right, but a test of the "sent" version works find. Very first thing in the command is a log message, so I know it's not getting called. I'm not sure how else to trouble shoot it. EDDI itself functions fine.
The event currently only triggers when messages are received from a player (as opposed to an NPC).