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EPS32实现WIFI自动重连的两种方法

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发表于 2021-8-25 11:05:09 | 显示全部楼层 |阅读模式
本帖最后由 zkzk 于 2021-8-25 14:33 编辑

一:定时检查连接
要在连接丢失后重新连接到 Wi-Fi,您可以使用 WiFi.reconnect() 尝试重新连接到之前连接的接入点:
WiFi.reconnect()
或者,您可以使用 WiFi.disconnect()  WiFi.begin(ssid,password).
WiFi.disconnect();//断开连接WiFi.begin(ssid, password);//重新连接
或者,您也可以尝试使用以下命令重新启动 ESP32 ESP.restart() 当连接丢失时。
您可以将类似于下面的代码段的内容添加到 loop() 定时时检查电路板是否已连接,并在失去连接时尝试重新连接。
  1. unsigned long currentMillis = millis();
  2. // 定时检查WIFI是否连接,如果无连接则重连
  3. if ((WiFi.status() != WL_CONNECTED) && (currentMillis - previousMillis >=interval)) {
  4.   Serial.print(millis());
  5.   Serial.println("Reconnecting to WiFi...");
  6.   WiFi.disconnect();
  7.   WiFi.reconnect();
  8.   previousMillis = currentMillis;
  9. }
复制代码
完整示例:
  1. #include <WiFi.h>

  2. // Replace with your network credentials (STATION)
  3. const char* ssid = "REPLACE_WITH_YOUR_SSID";
  4. const char* password = "REPLACE_WITH_YOUR_PASSWORD";

  5. unsigned long previousMillis = 0;
  6. unsigned long interval = 30000;

  7. void initWiFi() {
  8.   WiFi.mode(WIFI_STA);
  9.   WiFi.begin(ssid, password);
  10.   Serial.print("Connecting to WiFi ..");
  11.   while (WiFi.status() != WL_CONNECTED) {
  12.     Serial.print('.');
  13.     delay(1000);
  14.   }
  15.   Serial.println(WiFi.localIP());
  16. }

  17. void setup() {
  18.   Serial.begin(115200);
  19.   initWiFi();
  20.   Serial.print("RRSI: ");
  21.   Serial.println(WiFi.RSSI());
  22. }

  23. void loop() {
  24.   unsigned long currentMillis = millis();
  25.   // if WiFi is down, try reconnecting every CHECK_WIFI_TIME seconds
  26.   if ((WiFi.status() != WL_CONNECTED) && (currentMillis - previousMillis >=interval)) {
  27.     Serial.print(millis());
  28.     Serial.println("Reconnecting to WiFi...");
  29.     WiFi.disconnect();
  30.     WiFi.reconnect();
  31.     previousMillis = currentMillis;
  32.   }
  33. }
复制代码

二:WIFI事件自动连接
ESP32 能够处理不同的 Wi-Fi 事件。使用 Wi-Fi 事件,您无需经常检查 Wi-Fi 状态。当某个事件发生时,它会自动调用相应的处理函数。
  • SYSTEM_EVENT_STA_CONNECTED:ESP32 以站模式连接到接入点/热点(您的路由器);
  • SYSTEM_EVENT_STA_DISCONNECTED:ESP32 站与接入点断开连接。
转到下一部分以查看应用示例。
失去连接后重新连接到 Wi-Fi 网络(Wi-Fi 事件)
Wi-Fi 事件可用于检测连接丢失并在之后立即尝试重新连接(使用 SYSTEM_EVENT_AP_STADISCONNECTED事件)。这是一个示例代码:
  1. #include <WiFi.h>

  2. const char* ssid = "REPLACE_WITH_YOUR_SSID";
  3. const char* password = "REPLACE_WITH_YOUR_PASSWORD";

  4. //连接事件
  5. void WiFiStationConnected(WiFiEvent_t event, WiFiEventInfo_t info){
  6.   Serial.println("Connected to AP successfully!");
  7. }

  8. //获取IP事件
  9. void WiFiGotIP(WiFiEvent_t event, WiFiEventInfo_t info){
  10.   Serial.println("WiFi connected");
  11.   Serial.println("IP address: ");
  12.   Serial.println(WiFi.localIP());
  13. }

  14. //断开连接事件
  15. void WiFiStationDisconnected(WiFiEvent_t event, WiFiEventInfo_t info){
  16.   Serial.println("Disconnected from WiFi access point");
  17.   Serial.print("WiFi lost connection. Reason: ");
  18.   Serial.println(info.disconnected.reason);
  19.   Serial.println("Trying to Reconnect");
复制代码


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发表于 2024-2-26 18:17:43 | 显示全部楼层

Hello, Kiddishop

Hello from Kiddishop.
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发表于 2024-6-5 00:16:47 | 显示全部楼层

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发表于 2024-7-1 07:57:46 | 显示全部楼层

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