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The port can no longer be reused and the class how looks for the next free port on the system. This allows multiple Hubs to run in parallel.
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The samp.hub.shutdown request allows a client to shutdown the VO Hub. This is not part of the SAMP protocol but does not harm. It is basically needed for unit testing.
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The Hub is searched for when a client is initialised so that one can ping a Hub from a client.