It’s already using XTypes for everything derived; so, not much to figure out 
there.

> On Sep 27, 2020, at 5:42 PM, Tom Keffer <[email protected]> wrote:
> 
> 
> Here's the wiki on XTypes. I believe John has written an XTypes extension. 
> Between the two of you, I'm sure you can figure it out!
> 
> -tk
> 
> 
>> On Sun, Sep 27, 2020 at 8:47 AM Graham Eddy <[email protected]> wrote:
>> i had not thought to put the collection of AQI calculations into an 
>> extension to StdWXCalculate
>> 
>> i amend my suggested split of weewx-airlink to an ‘airlink’ data acquisition 
>> service providing PMx.x values, plus an ‘aqi’ extension to StdWXCalculate to 
>> convert PMx.x values to AQI-related values
>> 
>> and yes, i’d be happy to code this extension (mainly by pinching john’s 
>> code) if john wanted to head that direction - i’ll have to code something 
>> similar/simpler for myself anyway if john doesn't want to go that way (i.e. 
>> separate ‘aqi’ (sub-)service)
>> 
>>> On 27 Sep 2020, at 10:28 pm, Tom Keffer <[email protected]> wrote:
>>> 
>>> The "WeeWX way" is to emit what the hardware offers, then let 
>>> StdWXCalculate determine whether to keep it or calculate a new value in 
>>> software.
>>> 
>>> Right now, it's fairly easy to extend StdWXCalculate to calculate new types 
>>> via the XTypes facility. Gary and I are working on a version that will make 
>>> it even easier.
>>> 
>>>> On Sat, Sep 26, 2020 at 10:30 PM Graham Eddy <[email protected]> wrote:
>>>> i was about to pinch john’s code for the AQI side of things - i get PM2.5 
>>>> values via gw1000 - when i see this new driver announced. (i have found 
>>>> ecowitt’s purported 24 hour average values very unreliable - drifting, 
>>>> random resets, etc - but the actual pm2.5 values seem fine → derive the 
>>>> averaged values myself)
>>>> 
>>>> can i suggest that acquiring PMx.x values and deriving AQI values be kept 
>>>> as separate services? the AQI service would provide AQI xtype (mainly for 
>>>> cheetah) and convert PMx.x values in weewx packets to equivalent AQI 
>>>> values inserted into weewx packet (this is what i was going to implement). 
>>>> design-wise this would also allow support of AQI values derived from 
>>>> multiple pollution types (NO, etc) as well as abstracting the pollutant 
>>>> monitors
>>>> 
>>>>> On 27 Sep 2020, at 1:43 pm, John Kline <[email protected]> wrote:
>>>>> 
>>>>> Hi Rich,
>>>>> 
>>>>> I’ve created the github project here:
>>>>> https://github.com/chaunceygardiner/weewx-airlink
>>>>> 
>>>>> I haven’t had any issues with the extension, but it’s not a priority for 
>>>>> me until more is known about the AirLink.
>>>>> 
>>>>> Cheers,
>>>>> John
>>>>> 
>>>> 
>>>> 
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