使用stm32和esp8266同步时间的代码

您可以参考下面的代码：

#include <SoftwareSerial.h>
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>

IPAddress timeServerIP;
const char* ntpServerName = "cn.pool.ntp.org";
const int timeZone = 8; 
WiFiUDP Udp;
unsigned int localPort = 8888;
const int NTP_PACKET_SIZE = 48;
byte packetBuffer[NTP_PACKET_SIZE];
SoftwareSerial esp8266(2, 3);

void setup() {
  Serial.begin(9600);
  esp8266.begin(9600);
  WiFi.begin("your_SSID", "your_PASSWORD");
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  Udp.begin(localPort);
  Serial.println("UDP started");
}

void loop() {
  sendNTPpacket(timeServerIP);
  delay(1000);

  if (esp8266.available())
    Serial.write(esp8266.read());
  if (Serial.available())
    esp8266.write(Serial.read());

  if (Udp.parsePacket()) {
    Serial.println("Packet received");
    Udp.read(packetBuffer, NTP_PACKET_SIZE);
    unsigned long secsSince1900;
    secsSince1900 = (unsigned long)packetBuffer[40] << 24;
    secsSince1900 |= (unsigned long)packetBuffer[41] << 16;
    secsSince1900 |= (unsigned long)packetBuffer[42] << 8;
    secsSince1900 |= (unsigned long)packetBuffer[43];
    unsigned long epoch = secsSince1900 - 2208988800UL + timeZone * 3600;
    setTime(epoch);
    Serial.println(epoch);
    String date = String(day()) + "/" + month() + "/" + year();
    String time = String(hour()) + ":" + minute() + ":" + second();
    String datetime = date + " " + time;
    Serial.println(datetime);

    esp8266.println("AT+CIPSTART=\"TCP\",\"your_server_IP\",your_server_port");
    Serial.println("Trying to connect to server");

    while(!esp8266.find("OK")) {
      delay(1000);
      Serial.write(".");
    }
    Serial.println("");
    Serial.println("Connected to server");

   String postRequest = "POST /your_action HTTP/1.1\r\n";
   postRequest += "Host: your_server_IP:your_server_port\r\n";
   postRequest += "Content-Type: application/x-www-form-urlencoded\r\n";
   postRequest += "Content-Length: whatever your_content_length_is\r\n";
   postRequest += "\r\n";
   postRequest += "datetime=" + datetime;
   esp8266.println("AT+CIPSEND=" + String(postRequest.length()));
   if (esp8266.find(">")) {
     esp8266.print(postRequest);
   }
   delay(5000);

   while (esp8266.available()) {
     String message = esp8266.readStringUntil('\n');
     Serial.println(message);
   }
   esp8266.println("AT+CIPCLOSE");
   Serial.println("Connection closed");
   delay(10000);
  }
}

void sendNTPpacket(IPAddress& address) {
  memset(packetBuffer, 0, NTP_PACKET_SIZE);
  packetBuffer[0] = 0b11100011;
  packetBuffer[1] = 0;
  packetBuffer[2] = 6;
  packetBuffer[3] = 0xEC;
  packetBuffer[12]  = 49;
  packetBuffer[13]  = 0x4E;
  packetBuffer[14]  = 49;
  packetBuffer[15]  = 52;
  Udp.beginPacket(address, 123);
  Udp.write(packetBuffer, NTP_PACKET_SIZE);
  Udp.endPacket();
}

其中，你需要填写以下信息：

- your_SSID：Wi-Fi 名称
- your_PASSWORD：Wi-Fi 密码
- your_server_IP：服务器 IP 地址
- your_server_port：服务器端口号
- your_action：服务器端口的 Action
- your_content_length_is：需发送的数据的长度

此代码使用 ESP8266 发送 NTP 请求来同步时间，然后将时间发送给服务器。你需要将代码中的 your_server_IP，your_server_port，your_action 和 your_content_length_is 替换为您的服务器 IP 地址，服务器端口号，服务器端口的 Action 以及您要发送的数据的长度。