在sntp_request函数中,如果SNTP请求成功发送,那么会设置一个定时器,当达到指定的超时时间(例如,SNTP_UPDATE_DELAY)后,会再次调用sntp_request函数,从而实现周期性发送校时请求。 如果SNTP请求失败,例如因为服务器地址无效,那么会调用sntp_retry函数。在sntp_retry函数中,会设置一个新的定时器,当达到重试超时时间(例如...
Next, the[SNTP/SMTP]tab is accessed to configure the[Sanity Check]and[Round-Trip Delay Compensation]. Reduce the[SNTP Update Delay]for demonstration purposes only. 1.6. Clock configuration To achieve the best possible performance, the M7 core must run at the highest frequency allowed. To do so...
在Example Connection Configuration菜单下配置WiFi或以太网。 在Example Configuration菜单下Time synchronization method选项中的三种可用方法中选择一种方法来同步时间(默认update time immediately when received)。 时间同步周期由CONFIG_LWIP_SNTP_UPDATE_DELAY定义。此选项允许您设置时间同步周期(默认值为一小时)。此选项不...
This syncs the time every CONFIG_LWIP_SNTP_UPDATE_DELAY ms. However, if there is no network (wifi) connection, it doesn't sync the time, which is understandable. However, it also doesn't sync the time when the wifi connects again (see example below for explanation). Example: Wifi is...
void my_delay_ms(u32 time_ms) { vTaskDelay(time_ms / portTICK_RATE_MS); } SNTP校时 SNTP 指 简单网络时间协议(Simple Network Time Protocol),一个合格的物联网设备,少不了一个准确的钟。通过SNTP,可以使ESP32设备通过网络校准本地时间。使用起来也非常简单!
#define SYNC_DELAY_S 10 * 60 time_t currentTime() { return sntp_now; } struct tm currentTimeInfo() { return sntp_timeinfo; } void sntp_task(void *parm) { esp_sntp_config_t config = ESP_NETIF_SNTP_DEFAULT_CONFIG("pool.ntp.org"); esp_netif_sntp_init(&config); while(true) { ...
0.016 ppm Root delay : 0.001514490 seconds Root dispersion : 0.016857117 seconds Update interval : 1043.4 seconds Leap status : Normal [root@shamim-slave-1 ~]# [root@shamim-slave-1 ~]# chronyc sources 210 Number of sources = 2 MS Name/IP address Stratum Poll Reach LastRx Last sample ==...
简单网络时间协议(SNTP)(国外英文资料).doc,简单网络时间协议(SNTP) Organization: China interactive publishing network (/) The RFC document Chinese translation plan (/compters/emook/aboutemook.htm) E-mail:ouyang@ Translator: shenmusic hpchen@ Publication dat
一、连接WIFI 在进行时间同步之前,先连接WIFI #include"wifi.h" #include<string.h> #include<stdlib.h> #include"freertos/FreeRTOS.h" #include"freertos/task.h" #include"freertos/event_groups.h" #include"esp_wpa2.h" #include"esp_event.h" ...
ThismemorandumdoesnotobsoleteorupdateanyRFC.Aworking knowledgeofRFC-1305isnotrequiredforanimplementationofSNTP. 1.Introduction TheNetworkTimeProtocol(NTP)specifiedinRFC-1305[MIL92]isused tosynchronizecomputerclocksintheglobalInternet.Itprovides comprehensivemechanismstoaccessnationaltimeandfrequency dissemination...