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You don't need to do that. The SDK takes care of negotiating with the access point and scheduling wakeups at exactly the right interval to make packet processing work. This is *standard* WiFi functionality. It's how your phone's WiFi chip saves power.
Literally just calling wifi_set_sleep_type(LIGHT_SLEEP_T); in ESP8266_NONOS_SDK-2.2.1 (and not spinning the CPU) brings down average power consumption to <5mA average and pings still work, just with increased/variable latency as the ESP is asleep between TIM intervals.
Appreciate you sharing the info! Not that I am not aware of it. The power requirements for my app are far lower than what even the latest gen (and soon to be launched) ESPs can deliver. Hence resorted to another stunningly low power uC to wake up the ESP only when needed.
I don't believe that <5mA is achievable. I see more like 30mA averaged. https://bbs.espressif.com/viewtopic.php?f=7&t=24393 …
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