bug#62990: 30.0.50; UDP server closes connection upon receiving an empty packet

[Robert Pluim]

>>>>> On Wed, 26 Apr 2023 15:24:03 +0300, Eli Zaretskii <eliz@gnu.org> said:
    >> 
    >> I guess we could, but if the application asks us to send an empty
    >> packet we should do it.

    Eli> I didn't say that the default behavior should be that, I just asked
    Eli> whether it is conceivable that someone, somewhere could actually rely
    Eli> on the semi-buggy behavior, whereby empty packets aren't sent?

I canʼt conceive of it. If it ever does happen the fix is easy: check
the length of the message before sending it.

    >> 
    >> ie the UDP process is still running and can still receive messages

    Eli> And no one could ever expect that?  IOW, is this behavior obviously
    Eli> wrong?

Yes. The other end has sent a valid UDP packet, and we react by
closing the connection.

Robert
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