From type/IO/Socket/Async

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method bind-udp(IO::Socket::Async:U: Str() $host, Int() $port, :$broadcast --> IO::Socket::Async)

This returns an initialized IO::Socket::Async server object that is configured to receive UDP messages sent to the specified $host and $port and is equivalent to listen for a TCP socket. The :broadcast adverb can be specified to allow the receipt of messages sent to the broadcast address.