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I tried to use an Arduino implementation. Hours of digging through the source code later because half this stuff is undocumented I'm giving up, because the design choices are fundamentally stupid and broken. Why did I even try? Seriously. Sigh.
If you're wondering: ESP8266 variant. Can't make the main thread go to sleep and wake it up on wifi events. You get to poll. Which doesn't work when you want power saving. Which I kind of do because I'm building a temperature sensor and 70mA constantly will warm it up.
It's really sad, because I implemented my entire application in 200 lines of code using all these wonderful pre-existing libraries, and now I have to rewrite it (which will probably be 2000 lines) because I hit a fundamental showstopper with power management.
Arduino is a good platform for non-programmers. It’s a nice “beefy” version of a PIC, with a easy to use UI. But as soon as your design requires anything serious, then Arduino becomes a horrible mess.
I'd measured it on an ESP32 (sans Arduino), in which turning the wifi on drew upwards of 80 mA. I don't know of a mode that takes lower current than that while keeping the radio on. Does ESP even support one?
The point of WiFi power saving is you do *not* have to keep the radio on all the time. You wake up every ~300ms (depending on AP config) to listen for incoming packets. Read this PDF: https://www.espressif.com/sites/default/files/9b-esp8266-low_power_solutions_en_0.pdf …
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