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Improve discovery by sending multiple UDP datagrams

As UDP datagrams may get lost in transit, e.g.,  due to poor network connectivity,
we can improve the detection rate by sending multiple datagrams and hoping some
will get through to the devices.

Confirmed to improve the detection by @scubanarc: https://github.com/home-assistant/home-assistant/issues/21966

This is a new configurable option, defaulting to three discover packets.

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