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For one, an exclusive lock was being held for far too long, so I shortened it some.
Also, the Published event wasn't being called for QoS 2, only for QoS1. I fixed that.
As a side note, I noticed that you're not actively developing this tool. I work for 2lemetry which is an m2m provider. I would be glad to take over this repository - I think we could ensure it's continued development even if I get bored of it.