Hi, I suspect the issue will be to do with one of the fields you have added to the weeWX archive. It appears that the 'sum' field for one of the accumulators is being initialised to None instead of 0.0 and consequently when an observation value is added you get the error shown in your logs. I don't think the issue is with the driver you wrote. Might help if we could get a better picture of your setup. Can you please provide a sanitised copy of weewx.conf along with details of the schema you are using for the archive table in your weex database.
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