Ah, okay, you are right, I checked out the source code and it does do that
automatically. I also ran PN_TRACE_FRM=1 on the sender and found that the
delivery-tag is set correctly on the way out, yet it is empty on the other
side. I am using proton 0.9.1, and using an Apache Apollo broker. The
messaging works fine using a RabbitMQ broker.
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