Weewx and Mqtt

[Tim Shepherd]

Hi,

I have weewx linked via mqtt to a homeassistant.

Everything is working fine apart from the parameters highOutsideTemp and lowOutsideTemp which return incorrect results.

I can't see any errors in the installation - just wondering if anyone has any ideas

Thanks

[vince]

In the absence of any description of your setup, any logs or any snippets from your config file(s) - no, no ideas.

I've never heard of those two parameters nor where they might come from.

[Troy Roberts]

I'm going to go out on a limb and say there is no mqtt topic labeled highOutsideTemp and lowOutsideTemp. If there is it might me labeled something different. Do you have a list of all the topics /weather? 

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[Doug Jenkins]

Troy:

You can dump out the topic from your broker. I found Pat O'Brien's mqtt broker setup very helpful. I would read this for more insight

https://obrienlabs.net/how-to-setup-your-own-mqtt-broker/

Doug Jenkins 

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[Tim Shepherd]

Thanks for the replies I apologise for not providing more information 

I have attached a dump from of the MQTT messages output from Weewx. You can see the parameters I mentioned lines 61 and 62 and repeated here for clarity. 

highOutTemp_C = 14.722222222222221
lowOutTemp_C = 14.666666666666666

The data does not seem to relate to anything although the max value does seem to track the ambient temp to some degree

Here is the mqtt config bit from weewx.conf

 [[MQTT]]
        server_url = mqtt://XXXX:YY...@ZZZZ.local:1883/
        topic = weather
        unit_system = METRIC
        binding = archive, loop
        aggregation = individual

Tim

[Karen K]

Could you provide the complete weewx.conf? Please make sure to obfuscate passwords and IPs before sending it. Which driver do you use to receive the readings from the hardware? Which hardware? Which skin(s)? highOutTemp and lowOutTemp are not standard readings for WeeWX. So without knowing where they come from no-one can answer your question.

[steepleian]

I have observed similar. It appears to be the max and min between consecutive observations, or at the very least a very short time span.

Sent from my iPhone

On 13 Sep 2022, at 11:32, Karen K <kk44...@gmail.com> wrote:

Could you provide the complete weewx.conf? Please make sure to obfuscate passwords and IPs before sending it. Which driver do you use to receive the readings from the hardware? Which hardware? Which skin(s)? highOutTemp and lowOutTemp are not standard readings for WeeWX. So without knowing where they come from no-one can answer your question.

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[Tim Shepherd]

The software is connected to a Davis VantageVue station via the normal serial link

The configuration is pretty standard, I have enabled the standard and seasons reports. The MQTT and steel gauges  extensions have been installed.

High and low external temperatures are shown in the standard report so I assumed were standard parameters in the database. The values shown in this report seem correct and are different to the MQTT values.

I have attached a copy of the config file

[Warren Gill]

I offer this screen shot of MQTT explorer that I left running overnight to graph various topics

[vince]

I stand corrected. The parameters are in the MQTT loop info, I just never noticed it before.

Here's a screenshot of my setup here, with the graphs from grafana and the data from influxdb. 

You'll note that outTemp (purple) is always in between highOutTemp (green) and lowOutTemp (yellow), which seems reasonable to me.

My thought is that the outTemp (average across the archive period) shouldn't necessarily line up 'exactly' with either the high (max) or the low (min) reading for outside temperature during that archive period unless all the readings were absolutely identical for the entire archive period.

So I don't see a bug here....

[Tim Shepherd]

Vince thank you for that. I think you are correct. I had assumed that the max and min values were daily max and min values starting and ending at midnight. Looks like that is not the case