esp01s 自动连接wifi的一种方案

struct WiFiConnection {
  const char* ssid;
  const char* password;
};

const WiFiConnection wifiConnections[] = {
  { "wifi名称", "密码" },
};
unsigned long previousAttemptTime = 0;                                      // 上次尝试连接的时间戳
const unsigned long connectionAttemptInterval = 10000;                      // 尝试连接之间的时间间隔: 10秒
const unsigned long retryInterval = 30000;                                  // (毫秒)连接失败后再次尝试之前的等待时间: 30秒
bool attemptConnection = true;                                              // 是否尝试连接
int numConnections = sizeof(wifiConnections) / sizeof(wifiConnections[0]);  // 可尝试的连接数
int currentConnectionIndex = 0;                                             // 当前尝试的连接索引

ESP8266WiFiMulti wifiMulti;
WiFiClient client;

void addWiFiConnections() {
  int numConnections = sizeof(wifiConnections) / sizeof(wifiConnections[0]);
  for (int i = 0; i < numConnections; i++) {
    wifiMulti.addAP(wifiConnections[i].ssid, wifiConnections[i].password);
  }
}
//链接网络
void manageWiFiConnection() {
  if (WiFi.status() != WL_CONNECTED) {
    lightFlash(120);
    unsigned long currentTime = millis();
    if (attemptConnection && currentTime - previousAttemptTime >= connectionAttemptInterval) {
      Serial.println("WiFi connecting...");
      if (wifiMulti.run() == WL_CONNECTED) {
        Serial.println("");
        Serial.println("WiFi connected");
        Serial.println("IP address: ");
        Serial.println(WiFi.localIP());
      } else {
        attemptConnection = false;
        previousAttemptTime = currentTime;
      }
    } else if (!attemptConnection && currentTime - previousAttemptTime >= retryInterval) {
      Serial.println("30秒后再试");
      // 等待30秒后重置标志和索引，重新开始尝试连接
      attemptConnection = true;
      currentConnectionIndex = 0;
    }
  }
}

解释

retryInterval记住是毫秒;

addWiFiConnections()函数是在void setup()中调用一次就可以,然后调用manageWiFiConnection()；

manageWiFiConnection()函数最好也放置在loop()函数中,如果loop没有设置delay,建议设置一下