c - 如何在 esp-idf 中从 NTP 服务器重新同步时间？

Question

我使用带有 esp-idf 的 ESP32。我需要正确的时间，因此我正在尝试与 NTP 服务器重新同步时间。我用这个例子。[1]: https://github.com/espressif/esp-idf/tree/master/examples/protocols/sntp

当我再次调用obtain_time()方法时，设备正在重新启动。

我做错了什么？我没有找到任何有帮助的东西。

I (2259) initialise_wifi: Setting WiFi configuration SSID OpenWrt                                                                                                                                           
I (2359) syncTime: I'm runing :)                                                                                                                                        
I (2369) getTimeNow: Time is not set yet. Connecting to WiFi and getting time over NTP.                                                                                                    
I (2389) initialize_sntp: Initializing SNTP                                                                                                                                                
I (2389) obtain_time: Waiting for system time to be set... (1/10)                                                                                                                          
...                                                                                                                   
I (18389) obtain_time: Waiting for system time to be set... (9/10)  
-----The time is correct, but when i'm trying resync with NTP                                                                                                                        
I (20639) getTimeNow: Time is not set yet. Connecting to WiFi and getting time over NTP.                                                                                                   
I (20639) initialize_sntp: Initializing SNTP                                                                                                                                               
assertion "Operating mode must not be set while SNTP client is running" failed: file "/home/lenovov510/esp/esp-idf/components/lwip/lwip/src/apps/sntp/sntp.c", line 600, function: sntp_s
etoperatingmode                                                                                                                                                                            
abort() was called at PC 0x400d2c6b on core 1                                                                                                                                              

ELF file SHA256: 145d1f5e047670ed10c462ae090b3e64db1c5aa158a9988417a513b2ee801051                                                                                                          

Backtrace: 0x4008623c:0x3ffc7e00 0x40086489:0x3ffc7e20 0x400d2c6b:0x3ffc7e40 0x4011e251:0x3ffc7e70 0x400d28b4:0x3ffc7e90 0x400d28c7:0x3ffc7eb0 0x400d2aff:0x3ffc7f10 0x400d2bcd:0x3ffc7fa0 
0x4008b569:0x3ffc7fc0                                                                                                                                                                      

Rebooting...   

这是我的方法:

This give back the timestamp.
void getDateTime(char *dateTime)
{
  char *TAG = "getDateTime";
  time_t now;
  struct tm timeinfo;
  time(&now);
  localtime_r(&now, &timeinfo);
  char strftime_buf[64];
  setenv("TZ", "GTM-2", 1);
  tzset();
  localtime_r(&now, &timeinfo);
  strftime(strftime_buf, sizeof(strftime_buf), "%c", &timeinfo);
  sprintf(dateTime, "20%d-%d-%d+%d:%d:%d", timeinfo.tm_year - 100, timeinfo.tm_mon + 1, timeinfo.tm_mday, timeinfo.tm_hour, timeinfo.tm_min, timeinfo.tm_sec);
}

This method trying to update time. 
void syncTime()
{
  char *TAG = "syncTime";
  obtain_time();

}

static void obtain_time(void)
{
  static const char *TAG = "obtain_time";
  initialize_sntp();
  time_t now = 0;
  struct tm timeinfo = {0};
  int retry = 0;
  const int retry_count = 10;
  while (retry!=retry_count)// timeinfo.tm_year < (2016 - 1900) && ++retry < retry_count )
  {
    ESP_LOGI(TAG, "Waiting for system time to be set... (%d/%d)", retry, retry_count);
    vTaskDelay(2000 / portTICK_PERIOD_MS);
    time(&now);
    localtime_r(&now, &timeinfo);
  }
}
//----
static void initialize_sntp(void)
{
  static const char *TAG = "initialize_sntp";
  ESP_LOGI(TAG, "Initializing SNTP");
  sntp_setoperatingmode(SNTP_OPMODE_POLL);
  sntp_setservername(0, "pool.ntp.org");
  sntp_init();

...

//Update the timeInSec and Datettime variable
void updateTimeVariables(void *pvParameter)
{
  char *TAG = "updateTimeVariables";
  while (1 == 1)
  {
    getDateTime(dateTime);
    timeInSec = getTimeNow();
    vTaskDelay(500 / portTICK_PERIOD_MS);
  }

  vTaskDelete(NULL);
}

//Sync NTP server.
void updateTime(void *pvParameter)
{
  char *TAG = "updateTime";
  while (1 == 1)
  {
    syncTime();
    vTaskDelay(10000 / portTICK_PERIOD_MS);//1800000 / portTICK_PERIOD_MS);
  }
  vTaskDelete(NULL);
}

...
 xTaskCreate(&updateTime, "updateTime", 4000, NULL, 6, NULL);
  xTaskCreate(&updateTimeVariables, "updateTimeVariables", 4000, NULL, 0, NULL);

Answer 1

看起来您每次更新时间时都试图初始化 sntp。

观察obtain_time函数的第二行:

static const char *TAG = "obtain_time";
initialize_sntp();                     //   <<<< THIS ONE.
time_t now = 0;
struct tm timeinfo = {0};
//.....

您必须以 initialize_sntp 仅被调用一次的方式更改代码。