Function port_check::free_local_port_in_range

pub fn free_local_port_in_range<P: Into<Ports<R>>, R: RangeBounds<u16> + Iterator<Item = u16>>(
    port_range: P
) -> Option<u16>

Returns an available localhost port within the specified range. If the IP version is not specified, it defaults to IPv4. This happens when the port range is specified as a range.