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This allows creation of multiple listeners, with different protocols and/or SSL certificates. Related change: settings is now a class that is copyable and assignable, and is done so to each thread on reload. Semi-related fix: fix crash in quit when multiple threads initiated it. This came to light when testing the auth plugin settings.
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The ping/pong is actually untested at this point, because Paho (my test client for now) doesn't do those. I wonder if any do, because MQTT already has ping/pong.
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It can be defined in the config file, along with options.
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I kind of need a config file parser first, so I'm going to make that.
