[Doman]

We are using 0mq for monitoring of electric vehicles fleet. Millions of messages every day (hundreds of GB), zero problems with bad internet connection (common in moving vehicles). Every sent message is received regardless of connectivity issues. Just a little implementation annoyances here and there but it is serving us well since 2015.

[tsimionescu]

How does 0mq achieve that? For all I have read and tried to use of it, 0mq explicitly offers no message delivery guarantees, instead relying on your own implementation to achieve them. So, I don't doubt that your system works like you described, but I think you may be overvaluing 0mq's contribution to it.

[neurostimulant]

The ZeroMQ Guide has a chapter dedicated to reliability stuff: https://zguide.zeromq.org/docs/chapter4/

Maybe there is no guarantee, but it can handle unreliable connection just fine, at least when I used it a few years ago.