[lwip-devel] [bug #52345] MQTT buffer length check seems wrong

[David Bourgeois]

Follow-up Comment #4, bug #52345 (project lwip):

Sorry for the late answer. We still found a case where this fix doesn't work.
When the packet sent has no payload and a QoS of 0, then the last byte of the
packet is actually the last byte of the payload which isn't null terminated.
So the test will always fail in this case and there's no way to add the null
termination for the callback.

So here the fix should not only consider the test but also deal with the
buffer size.

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