esp8266-pinger.ino

#include <ESP8266WiFi.h>
#include <ESP8266Ping.h>

// WiFi設定
const char* ssid = "AAA";
const char* password = "8888888";

// 計時變數
unsigned long previousPingMillis = 0;
unsigned long previousReconnectMillis = 0;
const unsigned long pingInterval = 10000;  // 10秒
const unsigned long reconnectCheckInterval = 5000;  // 5秒

// Gateway IP地址
IPAddress gatewayIP;

// 連接WiFi的函數
void connectToWiFi() {
  Serial.print("連接WiFi網路: ");
  Serial.println(ssid);
  
  WiFi.begin(ssid, password);
  
  // 等待連接
  int attempts = 0;
  while (WiFi.status() != WL_CONNECTED && attempts < 20) {
    delay(500);
    Serial.print(".");
    attempts++;
  }
  
  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("\nWiFi已連接");
    Serial.print("IP地址: ");
    Serial.println(WiFi.localIP());
    
    // 獲取Gateway IP
    gatewayIP = WiFi.gatewayIP();
    Serial.print("Gateway IP: ");
    Serial.println(gatewayIP.toString());
    
    // 設置自動重連
    WiFi.setAutoReconnect(true);
    WiFi.persistent(true);
  } else {
    Serial.println("\n無法連接WiFi，稍後重試...");
  }
}

void setup() {
  Serial.begin(115200);
  delay(1000);
  Serial.println("\nESP8266 WiFi Ping程式");
  
  // 連接WiFi
  connectToWiFi();
}

void loop() {
  unsigned long currentMillis = millis();
  
  // 檢查WiFi狀態並在必要時重新連接（每5秒）
  if (currentMillis - previousReconnectMillis >= reconnectCheckInterval) {
    previousReconnectMillis = currentMillis;
    
    if (WiFi.status() != WL_CONNECTED) {
      Serial.println("WiFi連接斷開，正在重新連接...");
      connectToWiFi();
    }
  }
  
  // 每10秒ping一次gateway
  if (currentMillis - previousPingMillis >= pingInterval && WiFi.status() == WL_CONNECTED) {
    previousPingMillis = currentMillis;
    
    Serial.print("Ping Gateway (");
    Serial.print(gatewayIP.toString());
    Serial.println(")...");
    
    // 發送ping封包（不關心回應，根據需求）
    Ping.ping(gatewayIP, 1);
  }
}