i’ve implemented my own bidirectional gateway and i also parked this issue - 
next version’s problem, as i had no present need for it. but i am moving my 
system (of which weewx is a component) to mqtt backbone (e.g. my alarms weewx 
service moving to mqtt for more general use) so i would be very interested to 
discuss this issue with you as it impacts all my mqtt apps. i tracked the 
publish requests while they were in client-side queue but didn’t persist them, 
wondering about true need and performance cost

> On 3 Mar 2021, at 11:14 am, [email protected] <[email protected]> wrote:
> 
> In order to ensure data delivery, I’ve started investigating ‘persistent 
> sessions’ (clean_session = False) and a QOS = 2. I think on the subscribe 
> side it will be that easy - assuming the broker is configured correctly. On 
> the publish side, I’ll probably have to keep track of failed publishes and 
> have some type of retry - not sure I really want to deal with that...

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