3 files changed, 57 insertions, 0 deletions
diff --git a/components/sntp/CMakeLists.txt b/components/sntp/CMakeLists.txt
new file mode 100644
index 0000000..fc734f5
--- /dev/null
+++ b/components/sntp/CMakeLists.txt
@@ -0,0 +1,3 @@
+idf_component_register(SRCS "time_sntp.c"
+                    INCLUDE_DIRS "."
+                    PRIV_REQUIRES esp_system esp_netif esp_event)
diff --git a/components/sntp/time_sntp.c b/components/sntp/time_sntp.c
new file mode 100644
index 0000000..90cc1d1
--- /dev/null
+++ b/components/sntp/time_sntp.c
@@ -0,0 +1,36 @@
+#include "time_sntp.h"
+
+void set_tz(char* tz){
+    setenv("TZ", tz, 1); // Zürich tz
+    tzset();
+}
+
+void obtain_time(char t[4])
+{
+    time_t now;
+    struct tm timeinfo;
+    time(&now);  // Get the current time
+    localtime_r(&now, &timeinfo);
+    strftime(t, sizeof(t)+sizeof(char), "%H%M", &timeinfo); // Seems to require +1 char size to do it correctly
+    ESP_LOGI(SNTP_TAG, "The local time is: %s", t);
+}
+
+void sync_time(void)
+{
+    ESP_ERROR_CHECK(esp_netif_init());
+
+    ESP_LOGI(SNTP_TAG, "Initializing and starting SNTP");
+    /*
+     * This is the basic default config with one server and starting the service
+     */
+    esp_sntp_config_t config = ESP_NETIF_SNTP_DEFAULT_CONFIG(CONFIG_SNTP_TIME_SERVER);
+
+    esp_netif_sntp_init(&config);
+    // wait for time to be set
+    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(SNTP_TAG, "Waiting for system time to be synched... (%d/%d)", retry, retry_count);
+    }
+    esp_netif_sntp_deinit();
+}
diff --git a/components/sntp/time_sntp.h b/components/sntp/time_sntp.h
new file mode 100644
index 0000000..a8a894e
--- /dev/null
+++ b/components/sntp/time_sntp.h
@@ -0,0 +1,18 @@
+#ifndef SNTP_H
+#define SNTP_H
+
+#include <time.h>
+#include <sys/time.h>
+#include "esp_system.h"
+#include "esp_event.h"
+#include "esp_log.h"
+#include "esp_netif.h"
+#include "esp_netif_sntp.h"
+#include "esp_sntp.h"
+
+static const char *SNTP_TAG = "SNTP";
+
+void set_tz(char* tz);
+void obtain_time(char t[4]);
+void sync_time(void);
+#endif
+\ No newline at end of file