>
> Yes, but you need a timestamp in the message so that

In my dealings with MQTT I've been exclusively dealing with JSON encoded
strings, so a datetime is just another field in the message, did you do
something different?

On Thu, 9 Jul 2026 at 00:29, Greg Troxel <[email protected]> wrote:

> John Smith <[email protected]> writes:
>
> >>
> >> Perhaps, but it gets complicated.
> >
> > or if any variable was different enough than the last report.
> >
> >
> > This of course made easier by using multiple topics and setting retain on
> > published messages.
> >
> > Bonus points for parsing the retained messages on startup.
>
> Yes, but you need a timestamp in the message so that
>
>   weewx goes offline (down, network)
>
>   MQTT subscriber restarts
>
> doesn't lead to logging (now, old_data).  And I don't think anybody does
> this.  That's why I don't set retain.
>

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