https_request sample
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Outline
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <sys/time.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "esp_wifi.h"
#include "esp_event.h"
#include "esp_log.h"
#include "esp_system.h"
#include "nvs_flash.h"
#include "nvs.h"
#include "esp_netif.h"
#include "esp_netif_sntp.h"
#include "lwip/err.h"
#include "lwip/sockets.h"
#include "lwip/sys.h"
#include "lwip/netdb.h"
#include "lwip/dns.h"
#include "time_sync.h"
TAG
#define STORAGE_NAMESPACE
initialize_sntp()
obtain_time()
fetch_and_store_time_in_nvs(void *)
update_time_from_nvs()
Files
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SourceVuESP-IDF Framework and Exampleshttps_request samplemain/time_sync.c
 
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/* * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 *//* ... */ #include <string.h> #include <stdlib.h> #include <time.h> #include <sys/time.h> #include "freertos/FreeRTOS.h" #include "freertos/task.h" #include "freertos/event_groups.h" #include "esp_wifi.h" #include "esp_event.h" #include "esp_log.h" #include "esp_system.h" #include "nvs_flash.h" #include "nvs.h" #include "esp_netif.h" #include "esp_netif_sntp.h" #include "lwip/err.h" #include "lwip/sockets.h" #include "lwip/sys.h" #include "lwip/netdb.h" #include "lwip/dns.h" #include "time_sync.h"21 includes static const char *TAG = "time_sync"; #define STORAGE_NAMESPACE "storage" void initialize_sntp(void) { ESP_LOGI(TAG, "Initializing SNTP"); esp_sntp_config_t config = ESP_NETIF_SNTP_DEFAULT_CONFIG_MULTIPLE(2, ESP_SNTP_SERVER_LIST("time.windows.com", "pool.ntp.org" ) ); esp_netif_sntp_init(&config); }{ ... } static esp_err_t obtain_time(void) { // wait for time to be set int retry = 0; const int retry_count = 10; while (esp_netif_sntp_sync_wait(pdMS_TO_TICKS(2000)) != ESP_OK && ++retry < retry_count) { ESP_LOGI(TAG, "Waiting for system time to be set... (%d/%d)", retry, retry_count); }{...} if (retry == retry_count) { return ESP_FAIL; }{...} return ESP_OK; }{ ... } esp_err_t fetch_and_store_time_in_nvs(void *args) { nvs_handle_t my_handle = 0; esp_err_t err; initialize_sntp(); if (obtain_time() != ESP_OK) { err = ESP_FAIL; goto exit; }{...} time_t now; time(&now); //Open err = nvs_open(STORAGE_NAMESPACE, NVS_READWRITE, &my_handle); if (err != ESP_OK) { goto exit; }{...} //Write err = nvs_set_i64(my_handle, "timestamp", now); if (err != ESP_OK) { goto exit; }{...} err = nvs_commit(my_handle); if (err != ESP_OK) { goto exit; }{...} exit: if (my_handle != 0) { nvs_close(my_handle); }{...} esp_netif_sntp_deinit(); if (err != ESP_OK) { ESP_LOGE(TAG, "Error updating time in nvs"); }{...} else { ESP_LOGI(TAG, "Updated time in NVS"); }{...} return err; }{ ... } esp_err_t update_time_from_nvs(void) { nvs_handle_t my_handle = 0; esp_err_t err; err = nvs_open(STORAGE_NAMESPACE, NVS_READWRITE, &my_handle); if (err != ESP_OK) { ESP_LOGE(TAG, "Error opening NVS"); goto exit; }{...} int64_t timestamp = 0; err = nvs_get_i64(my_handle, "timestamp", &timestamp); if (err == ESP_ERR_NVS_NOT_FOUND) { ESP_LOGI(TAG, "Time not found in NVS. Syncing time from SNTP server."); if (fetch_and_store_time_in_nvs(NULL) != ESP_OK) { err = ESP_FAIL; }{...} else { err = ESP_OK; }{...} }{...} else if (err == ESP_OK) { struct timeval get_nvs_time; get_nvs_time.tv_sec = timestamp; settimeofday(&get_nvs_time, NULL); }{...} exit: if (my_handle != 0) { nvs_close(my_handle); }{...} return err; }{ ... }
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