MQTT 3.1.1 partial connect packets over TCP

Hello everyone,

Apologies if this has been answered before but I could not find a definitive answer so far.

When using a TCP transport, is a client library sending a partial connect packet (2 byte fixed header only) while connecting to an MQTT broker conforming to the specification?

I understand that it may not be a problem for an MQTT only broker but what about multi protocol brokers, packet inspectors, load balancers? The specification only has a non normative comment on line 395:

Packet inspectors, such as firewalls, could use the Protocol Name to identify MQTT traffic.

In the above case though, the protocol name is not sent as it resides in the variable header of the packet.

Any assistance would be greatly appreciated.

Thanks,

Alex Kritikos

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