1 files changed, 36 insertions, 0 deletions
diff --git a/esp32/main/ntp.c b/esp32/main/ntp.c
new file mode 100644
index 0000000..a1a7ded
--- /dev/null
+++ b/esp32/main/ntp.c
@@ -0,0 +1,36 @@
+#include <freertos/FreeRTOS.h>
+
+#include <time.h>
+#include <esp_log.h>
+#include <esp_netif_sntp.h>
+
+#include "ntp.h"
+
+const static char *TAG = "ntp";
+
+void ntp_init(void)
+{
+	setenv("TZ", "CST-8", 1);
+	tzset();
+
+	ESP_LOGI(TAG, "initializing SNTP");
+	esp_sntp_config_t sntp_conf = ESP_NETIF_SNTP_DEFAULT_CONFIG(CONFIG_SNTP_TIME_SERVER);
+	ESP_ERROR_CHECK(esp_netif_sntp_init(&sntp_conf));
+}
+
+int ntp_sync(void)
+{
+	int retry = 0;
+	const int retry_count = 15;
+
+	while (esp_netif_sntp_sync_wait(2000 / portTICK_PERIOD_MS) == ESP_ERR_TIMEOUT) {
+		ESP_LOGI(TAG, "waiting for system time to be set... (%d/%d)", retry, retry_count);
+		if (++retry >= retry_count) {
+			ESP_LOGE(TAG, "Failed to sync system time");
+			return 0;
+		}
+	}
+
+	ESP_LOGI(TAG, "system time set");
+	return 1;
+}