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(ClientId, Message) -> DiskWriteReceipt
Persist non-delivered QoS 1/2 messages to LevelDB when a client session goes offline, flushing them back to memory once the client reconnects.
Problem it solves
Keeping large message queues for disconnected clients in RAM leads to memory exhaustion.
Consumes
Emits
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.