Just to add, this has one button and two LEDs. However no JST power connector or battery switchover circuitry - nobody really seemed to be using it that much and it makes layout a headache and adds to the cost.
Well, I found that power management is critical in iot...
So, since the esp is not as power saving as it should be to use it on its own. I would suggest to carefully integrate the opportunity to switch completely off the esp from it's mcu fellow. And more or less let this mcu handle all of the io and realtime stuff before waking up the esp.
That's just an opinion.
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