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The MQTT client accepted packets with invalid fixed header flags, such as a PUBLISH with QoS 3 or a PUBREC with flags set, and also a Remaining Length encoded in 5 bytes. I added a check on the fixed header flags per packet type and a 4 byte limit on the Remaining Length, and the client now closes the connection in these cases as the MQTT spec requires. I also added a small unit test for the header parsing and flag checks.
Fixes #897