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Sending a zero-length UDP packet to asyncore closes socket by default.
The default implementation of recv() assumes that zero-length data means close. This isn't true for UDP - it is possible to send a zero-length payload packet.
A possible work-around is to overload handle_close() and not call self.close(). However, as handle_close() is called as part of exception handling, we can't determine whether the handle_close() is happening due to a zero-length payload or an exception event.
It should be possible to process a zero-length payload UDP packet.