I’m guessing that you are using MQTTSubscribe…
It depends on how the sensor is 'reporting' rain.  WeeWX expects the 
observation rain to be a delta value. If the sensor is 'reporting' a total 
value, it needs to be converted to a delta value. While MQTTSubscribe can 
do the conversion (see, 
https://github.com/bellrichm/WeeWX-MQTTSubscribe/wiki/Configuring#contains_total),
 
starting in 4.2/4.3 this functionality is built into WeeWX. Some 
information on configuring WeeWX can be found here, 
https://groups.google.com/g/weewx-user/c/FYHyoM9AfGw. Since calculating a 
delta is now built into WeeWX, this functionality will eventually be 
removed from MQTTSubscribe.
It also might be a unit conversion 'error'. 
Based on the information provided, those would be my first guesses.
rich
On Thursday, 8 December 2022 at 07:54:58 UTC-5 [email protected] wrote:

> I seem not to be getting the correct rain information
> I have a Hideki-rain sensor connected to Weewx via rtl_433 and a mqtt 
> broker.
>
> my weewx.conf includes;
>
>      # Hideki-Rain
>             # Hideki-Rain
>         [[[rtl_433/napali-server/devices/Hideki-Rain/4/0/rain_in]]]
>             # The WeeWX name.
>             name = rain
>
> is this the correct config? do I use rain, rain_total, rain)in.......?
>
>
>

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