Check whether a TCP port can be opened or not
(integer) A TCP port in [0, 65535].
canPortBeUsed(port) returns a logical indicating whether the port can
be opened or not, or cannot be queried. If the port can be opened,
TRUE is returned, if cannot be opened then
FALSE is returned,
which may happen if the port is used by another process.
If port querying is not supported, as in R (< 4.0.0), then
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