Reproducable: always I've got everything setup working correctly (shares and all). Sending a message via: net send USER message works correctly. Broadcasting a message via: net send * fails to call the message command script.
If it's still broken in 3.5, please reopen. 3.0 isn't supported anymore.
This one is a feature request, afaik we don't do that yet. I'll keep that open
The challnege is that these broadcasts (over SMB1 which we are trying to kill) go to NMBD, not smbd, and not on a session, just over a single packet. Even if we wanted to this would be a huge risk for abuse (it would at the very least have to fork a process per UDP packet). I'm symathetic, I was someone who once wanted this to catch a student who was abusing this against Windows! Just say no to winpopup, just say no to SMB1. I'm going to mark this as WONTFIX.