Comment 7 for bug 1708008

Wit hthe help of the upstream IRC I found that the durable queue only makes the queue durable.
As outlined in my former [1].

TL;DR I need to persist the messages on publish.
In my example that is

 channel.basic_publish(exchange='',
- routing_key='hello',
- body='Hello World!')
+ routing_key='hellod',
+ body='Hello World!',
+ properties=pika.BasicProperties(
+ delivery_mode = 2, # make message persistent
+ ))
 print(" [x] Sent 'Hello World!'")
 connection.close()

With that it survives a restart

root@x:~# ./send.py
 [x] Sent 'Hello World!'
root@x:~# ./send.py
 [x] Sent 'Hello World!'
root@x:~# rabbitmqctl list_queues name durable messages
Listing queues ...
hellod true 2
root@x:~# systemctl restart rabbitmq-server
root@x:~# rabbitmqctl list_queues name durable messages
Listing queues ...
hellod true 2
root@x:~# ./receive.py
 [x] Received 'Hello World!'
 [x] Received 'Hello World!'

@Iain have we lost messages that were in persistent deliver mode or might that have been what happened?