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[mosquitto-dev] max_queued_messages

The problem:
* We want to have 1000s of topics with lots of publishers (through 3G remote connections), and 1-2 subscribers (on the DataCenter). 
* There is a requirement of no data loss, QoS will be 2

1) How can the publisher know  if the subscriber is getting the data or if the max_queued_messages is reached (e.g. the subscriber crashed/is restarting/etc) and the previous messages are being dropped? We really wouldn't like to implement an application-level flow control, that should be preferably handled by the queue.
2) Could the broker throttle/stop publishing for channels
3) Is the queue size per topic, publisher or subscriber
4) Can we check the queue size with a SYS query?

What are your suggestions?
Best Regards,

Spiros Ioannou 
Infrastructure Lead Engineer

M: +30 6973-903808
W: +30 210-6802-358

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