Ivan Grokhotkov f8750eb58d lwip: add compatibility headers for sntp.h and esp_ping.h ...

Before LwIP was moved into a submodule, sntp and esp_ping were
available as the following includes:

#include "apps/sntp/sntp.h"
#include "esp_ping.h"

This commit makes header files available at the old location, and adds
a deprecation warning for sntp.h.

Closes https://github.com/espressif/esp-idf/issues/2392

2018-09-21 14:09:37 +08:00

..

ping.h

Feature/sync lwip as submodule

2018-09-06 19:43:08 +08:00