WeatherlinkliveUDP and WU Rapidfire

[Rory Gillies]

Hi,

I am using the WeatherLinkLiveUDP driver with Weewx to access my David Vantage Pro2 Plus station. Everything works a treat (you can see my weather page here using the excellent Neowx-Material skin: https://www.360shetland.co.uk/weather/index.html

I upload to PWS Weather, Windy, and Weather Underground using the rapidfire mode. I had an issue with wind speed being higher than wind gust speed which I have fixed, however the pressure value only seems to be updated every 30 seconds rather than with each loop. My WU Rapid station is here: https://www.wunderground.com/dashboard/pws/ISHETL39/

Is there any way to append the pressure value to the loop data that is uploaded? Although the pressure is recorded and can be seen in the station current condition, the pressure dial disappears for 30 seconds then appears briefly until the next loop packet is uploaded. It's not the end of the world, but I would like the pressure dial to be there all the time.

Thanks,

Rory

[Rory Gillies]

I meant to say, WeatherLinkLiveUDP is set to 10s interval, it makes no difference at 30s, so I assume the UDP packets from WLL only send the pressure every 30 seconds or so.

[Brent Musat]

Did you ever find a solution to this?  I also have the Rapidfire enabled and have a 10s interval but the pressure only appears on WU every 30 or seconds for a brief period of time too.  https://www.wunderground.com/dashboard/pws/KTXAUSTI2863

thanks

[Rory Gillies]

Hi Brent,

Yes I did, I changed the driver to this one: https://github.com/Drealine/weatherlinklive-driver-weewx

It sorts out the disappearing pressure readings and has more configuration options than WeatherLinkLive UDP.

Hope this helps,

Rory

[Brent Musat]

Thanks Rory,

With the 5 or so different versions of WLL drivers it's difficult to know which one to use..  I will try the one you mentioned. 

brent...

[Brent Musat]

So I tried three different drivers for WeatherLink Live that interfaces with my Davis Vantage Vue Wireless ISS:

• WeatherLinkLiveUDP - https://github.com/grebleem/weewx-weatherlinkliveudp
• WeatherLink Live - https://github.com/michael-slx/weewx-weatherlink-live
• WLLDriver - https://github.com/Drealine/weatherlinklive-driver-weewx

All three of them have pros and cons and slightly different configuration, but they all seem to work fine with the WLL and my weather station.  All three of them will send RapidFire packets to Weather Underground and I can see it updating every 2-8 seconds, but the barometric pressure still drops out with all three of those drivers.  The pressure will only show up every 20-30 seconds or so..  And I noticed that it seems to be that the LOOP packets cause problems because the barometric pressure is not part of the LOOP packets that come from the Davis WLL every 2.5 seconds.

I don't understand enough about how the data is aggregated in weewx to understand how the LOOP packets are suppose to be read, aggregated, and sent to WU, but that seems to be the problem why the pressure only shows up for a couple seconds every 20-30 seconds... because only those fully populated packets with barometric pressure are displayed properly on WU.

I did find a quick work around, although it limits the speed of the RapidFire packets displayed on WU.  I noticed that roughly only 1 in 5 of the LOOP packets has barometric pressure readings, so by adding the following works:

[StdRESTful]

    [[Wunderground]]

        [[[Essentials]]]

            barometer = True

The "Essentials... barometer = True"in the Wunderground section ensures that RapidFire packets sent to WU have the barometric pressure.  Granted this limits the RapidFire speed to roughly every 10-12 seconds in lieu of 2.5 seconds, but I find it acceptable to not have the pressure dropping in and out on my WU station page...

And I stuck to using the WeatherLink Live driver because it seems to have the best documentation and options.  

ymmv,

brent...

[Kevin Key]

Thanks for this info. I'm able to go back to having Rapid-Fire work with my Acu-Rite Atlas without the Pressure reading constantly disappearing.