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When a publish, subscribe or unsubscribe request was cancelled or timed out client-side, the corresponding awaitable was removed from the packet dispatcher. A subsequent PUBACK / PUBCOMP / SUBACK / UNSUBACK arriving from the broker then fell through to the default case and raised an MqttProtocolViolationException, which forced a disconnect. Under high publish load (issue #2079) and from multiple threads (issue #2078) this manifested as sporadic connection drops. Match these acknowledgement packets explicitly and log a warning when no awaiter is registered, instead of treating it as a protocol violation. The connection is now preserved. Also documents the thread-safety guarantees of IMqttClient: publish, subscribe, unsubscribe and ping operations are safe to invoke concurrently. Connect / disconnect must still be coordinated. Co-authored-by: meisa <meisa@MAFDEL> Co-authored-by: christian <6939810+chkr1011@users.noreply.github.com>