loading date/time via SNTP

Signed-off-by: Peter Siegmund <peter@rdkr.com>

ePaper-ESP-IDF/components/connectivity/ntp.c

@@ -0,0 +1,76 @@
+#include "ntp.h"
+
+#include <string.h>
+#include <sys/time.h>
+#include <time.h>
+#include "esp_attr.h"
+#include "esp_event.h"
+#include "esp_log.h"
+#include "esp_netif_sntp.h"
+#include "esp_sleep.h"
+#include "esp_sntp.h"
+#include "esp_system.h"
+#include "lwip/ip_addr.h"
+#include "nvs_flash.h"
+
+#include "sdkconfig.h"
+
+static const char* TAG = "NTP";
+
+void obtain_time(void) {
+  ESP_LOGI(TAG, "Initializing SNTP");
+
+  esp_sntp_config_t config =
+      ESP_NETIF_SNTP_DEFAULT_CONFIG(CONFIG_SNTP_TIME_SERVER);
+  config.start = false;
+  config.server_from_dhcp = true;
+  config.renew_servers_after_new_IP = true;
+  config.index_of_first_server = 1;
+  config.ip_event_to_renew = IP_EVENT_STA_GOT_IP;
+  esp_netif_sntp_init(&config);
+
+  ESP_LOGI(TAG, "Starting SNTP");
+  esp_netif_sntp_start();
+
+  // wait for time to be set
+  time_t now = 0;
+  struct tm timeinfo = {0};
+  int retry = 0;
+  const int retry_count = 15;
+  while (esp_netif_sntp_sync_wait(2000 / portTICK_PERIOD_MS) ==
+             ESP_ERR_TIMEOUT &&
+         ++retry < retry_count) {
+    ESP_LOGI(TAG, "Waiting for system time to be set... (%d/%d)", retry,
+             retry_count);
+  }
+  time(&now);
+  localtime_r(&now, &timeinfo);
+
+  esp_netif_sntp_deinit();
+}
+
+esp_err_t init_ntp(void) {
+  time_t now;
+  struct tm timeinfo;
+  time(&now);
+  localtime_r(&now, &timeinfo);
+
+  if (timeinfo.tm_year < (2016 - 1900)) {
+    ESP_LOGI(
+        TAG,
+        "Time is not set yet. Connecting to WiFi and getting time over NTP.");
+    obtain_time();
+  }
+
+  char strftime_buf[64];
+
+  // Set timezone to Eastern Standard Time and print local time
+  setenv("TZ", "CET-1CEST,M3.5.0,M10.5.0/3", 1);
+  tzset();
+  time(&now);
+  localtime_r(&now, &timeinfo);
+  strftime(strftime_buf, sizeof(strftime_buf), "%c", &timeinfo);
+  ESP_LOGI(TAG, "The current date/time in Berlin/Europe is: %s", strftime_buf);
+
+  return ESP_OK;
+}