esp-idf/examples/wifi/power_save/README.md

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# Wifi Power Save Example
This example shows how to use power save mode of wifi.
Power save mode only works in sta mode.
* No power save: This is default mode. And the esp32 will work with full power.
* modem sleep: If you set power save mode as modem sleep, 10s later after connecting to AP, esp32 will wake up and sleep(turn off RF and PHY) periodically.
* others: not supported yet.