Description

I was working on an application that uses Swarrot and I notice it does not publish (by default) messages with delivery_mode=2.

It's very important to set this property if you don't want to loose messages.

Durable queue is not enough!
TL;DR:

• Durable queue means the queue will be persisted after a crash (but content will be lost)
• Message with delivery_mode=2 will be persisted after a crash

So I looked into the Messager component to be sure we did not make the same mistake.
And ... It looks like we made the same error. I did not deeply search for delivery_mode=2 but at the first glance I was not able to find it.

More over, it looks like it's not possible at all to to set the delivery_mode :/
EDIT: it looks like is possible

I'm not an expert of Messenger Component, this is why I'm opening this issue to be 100% sure we did not miss anything.

Thanks