So wifi_fpm_set_wakeup_cb is a new function in the attached library? It wasn't documented in the SDK 1.4.0 Programming Guide?
You write "If ESP8266 entered the light sleep mode, it needs to be waked up via external GPIO", this is in contradiction to the SDK Programmng Guide description of wifi_fpm_do_sleep() (page 86) which states "Force ESP8266 enter sleep mode, and it will wake up automatically when time out."
Thanks!
[Resolved]wifi_fpm_do_sleep crashes
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