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

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Closes: https://github.com/espressif/esp-idf/issues/4386
Closes: IDFGH-2237
Closes: IDF-1199
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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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docs/en/api-guides/lwip.rst
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@@ -17,7 +17,7 @@ Adapted APIs
Some common lwIP "app" APIs are supported indirectly by ESP-IDF:
- DHCP Server & Client are supported indirectly via the :doc:`/api-reference/network/esp_netif` functionality
- Simple Network Time Protocol (SNTP) is supported via the :component_file:`lwip/include/apps/esp_sntp.h` functions (see also :example:`protocols/sntp`)
- Simple Network Time Protocol (SNTP) is supported via the :component_file:`lwip/include/apps/sntp/sntp.h` :component_file:`lwip/lwip/src/inlude/lwip/apps/sntp.h` functions (see also :ref:`system-time-sntp-sync`)
- ICMP Ping is supported using a variation on the lwIP ping API. See :doc:`/api-reference/protocols/icmp_echo`.
- NetBIOS lookup is available using the standard lwIP API. :example:`protocols/http_server/restful_server` has an option to demonstrate using NetBIOS to look up a host on the LAN.
- mDNS uses a different implementation to the lwIP default mDNS (see :doc:`/api-reference/protocols/mdns`), but lwIP can look up mDNS hosts using standard APIs such as ``gethostbyname()`` and the convention ``hostname.local``, provided the :ref:`CONFIG_LWIP_DNS_SUPPORT_MDNS_QUERIES` setting is enabled.