Merge branch 'bugfix/ci_lwip_sntp_2_servers' into 'master'

ci/lw-ip: Use 2 SNTP public servers in CI config

See merge request espressif/esp-idf!18795

examples/protocols/sntp/main/sntp_example_main.c

@@ -185,6 +185,8 @@ static void initialize_sntp(void)
 #else   /* LWIP_DHCP_GET_NTP_SRV && (SNTP_MAX_SERVERS > 1) */
     // otherwise, use DNS address from a pool
     sntp_setservername(0, CONFIG_SNTP_TIME_SERVER);
+
+    sntp_setservername(1, "pool.ntp.org");     // set the secondary NTP server (will be used only if SNTP_MAX_SERVERS > 1)
 #endif
 
     sntp_set_time_sync_notification_cb(time_sync_notification_cb);

examples/protocols/sntp/sdkconfig.ci

@@ -0,0 +1,2 @@
+CONFIG_SNTP_TIME_SERVER="time.windows.com"
+CONFIG_LWIP_SNTP_MAX_SERVERS=2