UDP open - reconnect logic required?

[bjustice]

Another network question:

Do I have to implement reconnect logic when using UDP?

More pointedly:

If I successfully open a UDP port, then will this UDP connection ID ever become invalid or closed somehow in a way that would force me to close it and then reopen it to reestablish communications?

Example: TCP requires proper handling of reconnect logic.  When the client or server closes the TCP connection, then the connection is closed on both ends.