3.1 Connect - Client requests a connection to a Server reads in part:

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After a Network Connection is established by a Client to a Server, the first flow from the Client to the Server MUST be a CONNECT Packet [MQTT-3.1.0-1].

A Client can only flow the CONNECT Packet once over a Network Connection.
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The "flow" language threw me off. I assume this is equivalent to send/receive based on the context?

I ask because the numbers on forms of flow are:

flow - 15
flowed 4
flowing 4
flows 3

where as:

receive 23
received 23
receives 22

send 27
sending 13

So I would say the flow/flowed/flowing/flows is definitely in the minority. Suggest conforming to send/receive as the standard language for the draft.