Minor line 35: change TCPIP network, to operating environment
line 42: remove bracketed section
line 254: remove "allows applications to exchange messages with specific levels of reliability. It" and restructure introduction sentence for clarity
line 292: make it clear that the DUP flag must be set to 0 if QOS 0 messages
line 351: remove MultiByte length header and reword in terms of remaining length (global change: help with readability and simplicity)
In addition remove confusion around 'digit' in the algorithm (i.e., resolve MQTT-29)
line 471: Section 2.3 moved to start of Section 2 as part of the introduction as it is a key concept
line 431: Non-normative content promoted --> client server pairs must be able to manage overlapping packetIDs
line 486: remove surrogate pairs removed as not longer relevant (machine representation v wire format)
line 493: Storing state subsection moved to Section 4
line 1293: Section 4 "Flows" changed to "Implementation consideration"
line 500+ "MQTT Control Packets": move description of terms and discussion under correct subsections
line 501+ restructure CONNECT subsection for clarity
line 750: refactor existing CONNECT processing steps under 3.1.4 "Response"
line 880: remove QoS descriptions and refer to 4.1 "QoS levels and flows"