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Would have been more entertainig if he had broadcast his own UDP music. Perhaps the 8bits were some checksum to prevent such hackery?

Or record and broadcast yourself saying "this elevator is going directly to HELL" in a spooky Vincent Price voice!

Or David S Pumpkins music every time the doors open

What will the elevator speaker do if it received 2 music packets instead of 1?

It's UDP, so it'd probably take it, or at most silently discard one, by my guess