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In preparation for clean session and qos.
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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.
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This saves mildly costly calls to find().
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It's a little faster.
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We use epoll now to change readiness.
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The test cases give a bunch of warnings, but that's the COMPARE macro's fault. Let's see what to do...
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The MQTT docs showed a wrong condition for checking malformed packets. And, we have to grow buffers to MAX_PACKET_SIZE, otherwise we can't process. I still have some inteligent buffer shrink logic in mind.
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There still is a bug: writing a very big packet. I wrote the test case already.
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Because the connectionClose would set fd=-1, clients were never properly removed from the map, because the fd is the key. Also fixed a locking issue when an exception happened.
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Also materializes some concepts about MqttPacket.
