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This prevents bugs because the calling context forgets it. A (small) downside is that I have to make the Publish argument non-const. But, that's exactly what it is then, so...
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This is a preparation for MQTT5, because when there are receivers and publishers with different protocols, you can't always just write out the same packet. You can sometimes though, so that's what the copy factory determines.
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This entails making copies of the original packet when necessary, because QoS 0 doesn't have a packet id. I tried to keep it to an absolute minimum and do some precarious optmizations for it. There are tests though.
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Files are simple serialized bytes prefaced by lengths. File is hashed to verify integrity. This was also a good way preventing unexpected errors when trying to crash the parser by having it load a different file. This change includes some refactoring that was necessary: - It 'fixes' looking at the wrong thread's authentiction. This is still wrong though. It will be fixed by a thread local pointer in the next commit. - Deadlocks with yourself are handled in rwlockguard. - QoSPacketQueue is now a class. - Probably other tweaks.