Sticky MQTT Sessions and queueing (clean session = false) not working

[Ralf Rottmann]

We're evaluating RabbitMQ for an MQTT solution but would need queueing / sticky sessions. However, we cannot seem to get them to work.

Here is what we did so far:

• Installed RabbitMQ and used the default config.
• Did not manually add any exchanges, bindings or queues.
• Used the Mosquitto command line client to subscribe, with clean sessions = false. CLI: 
  mosquitto_sub -A localhost -p 1883 -c -t /broker/tb-987BF31183EB -i mosquitto_sub
• Used the Mosquitto command line client to publish. CLI:
  mosquitto_pub -A localhost -p 1883 -i mosquitto_pub -t /broker/tb-987BF31183EB -q 1 -m Tick
  

On connection of the subscription client, we can see two queue being created via Management GUI:

• mqtt-subscription-mosquitto_subqos0
  
• mqtt-subscription-mosquitto_subqos1
  

When publishing while the subscribed client is connected, everything works fine.

However, when the client disconnects, the queues vanish. Publishing still works.

We'd expect, that once the client connects again, the queued messages get pushed out. However, that does not work. We do see, that the two queues are recreated on connect, however, no messages get published out.

Any help is greatly appreciated.

[Ralf Rottmann]

One addition: When the subscribing client disconnects, the mqtt-subscription-mosquitto_subqos1 stays, so it remains visible in the Management GUI (as expexted).

[Ralf Rottmann]

Solved it myself. I was missing a binding.

[Michael Klishin]

Sticky sessions and QoS 0 make no sense when used together. QoS 0 instructs RabbitMQ to use transient queues, by design. Use QoS 1 if this is not desirable.

On 7 Oct 2016, at 15:18, Ralf Rottmann <ra...@rottmann.net> wrote:

One addition: When the subscribing client disconnects, the mqtt-subscription-mosquitto_subqos1 stays, so it remains visible in the Management GUI (as expexted).

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