I don't see any (easy) way to get around having to have your clients let the server know they want to receive data. I suppose you can have the clients just close the socket when they're tired of listening and the server could remove them when the send fails but you still need some way to know which clients to send to.
Since you're on a LAN, I suppose you could send to the broadcast address and let the clients listen when they want to. If you are dealing with a sane OS you might want to check out IO::Socket::Multicast.
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