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This includes a timer mechanism.
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Connected to this is preventing duplicate subscriptions. It's a bit unclear what to do when you get a subscription for the same topic with a different QoS? Change the Qos? Ignore?
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Also includes fixes to packet parsing that I couldn't make a separate commit for. When it comes to QoS 1, these things are still left, off the top of my head: - vector for qos queue? It helps with ordering and is CPU cache friendly. - Store subscription QoS. - Do retained messages have QoS? - Give session client's name, to access it later.
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In preparation for clean session and qos.
