Weather Station Hardware > Davis Instruments Weather Stations
Which logger? A schematic
jav:
--- Quote from: johnd on October 18, 2022, 04:10:41 PM ---OK, let me be more specific. Unlike the traditional Davis data loggers, WLL has no concept of summary/archive data as a separate special data format where the summary is generated and stored within the logger.
--- End quote ---
Yes, it does. WLL sends both archive and loop data to weatherlink.com during normal operation. When catching-up, it only sends the archive data for the missed period. Archive data is generated and stored within the logger. Archive period is configured through weatherlink.com web interface and it's configured into WLL. It sends archive data using this period.
johnd:
--- Quote from: jav on October 18, 2022, 04:17:33 PM ---Yes, it does. WLL sends both archive and loop data to weatherlink.com during normal operation.
--- End quote ---
That's how the old loggers work. WLL is different AIUI. Look at the API documentation, which hints at in notes like this: 'Please be aware that the WeatherLink v2 API is not a one-to-one correlation with the v1 API. The focus of the v2 API is on the raw data from the weather station as it is reported to the WeatherLink.com service. The v1 API was more focused on mixing different kinds of data together to form a report.' WLL uses only the v2 API. The stream of 1-minute real-time records is what wl.com calculates its archive data from AIUI.
jav:
--- Quote from: johnd on October 18, 2022, 04:34:17 PM ---That's how the old loggers work. WLL is different AIUI. Look at the API documentation,
--- End quote ---
I took another path: I looked into the traffic between WLL and weatherlink.com, analyzed it, decoded it and emulated the connection. I can confirm that both loop and archive data are present. I've been collecting archive packets successfully for a few months already (and catching-up every now and then).
Here is some code I wrote to be used in Weewx:
https://github.com/michael-slx/weewx-weatherlink-live/pull/22
johnd:
@jav: OK, thanks, sounds like good work. Always willing to be proved wrong if there is concrete evidence to the contrary. Davis have obviously been keeping very quiet about this possibility.
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