Does this field control the amount of events stored on the device? if so, is there some sort of queue which will cause the device to 'cache' number of events before reporting back to the hub? All answers I've found have been a guess or ambiguous at best.
The point is that my device reports some events right away but others there is a huge delay, I was wondering if the 'event history size' and/or 'State history size' have any impact?
Nope.
What’s the device and what driver does it use?
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Welcome to the Hubitat forums!
No, it is simply a history of events. If events are missing or delayed, this often indicates hardware or communication issues with a device.
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thanks. that's helpful 
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