ESP32 light sleep mode and WiFi on/off

[king2]

Hi!

I need sometimes to shutdown WiFi, and start it again, in two cases:

1. going to light sleep to consume less energy
2. sometimes I need to start MCU without WiFi, run, then (later) start WiFi by external command, and then stop it again (activate interface, configure, shutdown WiFi and then run on battery without WiFi - when WiFi is not needed)

As I understand, framework has begin() functions, so I need to call "esp8266React.begin(); server.begin();", but how to finish WiFi gracefully so it can be started again (without MCU hard reset in between, just sleep and running like it was loooong delay)?

Thank you in advance!