docs: Add System time chapter and for sntp a description about using CONFIG_LWIP_SNTP_UPDATE_DELAY option

Closes: https://github.com/espressif/esp-idf/issues/4386
Closes: IDFGH-2237
Closes: IDF-1199
This commit is contained in:
KonstantinKondrashov
2019-11-25 15:03:38 +08:00
committed by Angus Gratton
parent 1fd7f21d8c
commit c23549c04f
6 changed files with 142 additions and 1 deletions

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.. include:: ../../../en/api-reference/system/system_time.rst