Arduino以太網在30秒後失去連接

Question

我有一個帶有Wiznet以太網盾的Arduino Uno，它可以很好地連接到路由器。但是經過一段時間（大約30秒）後，它會失去與路由器的連接並進入脫機狀態。有人在代碼中看到它的原因嗎？

#include <Ethernet.h> 
#include <SPI.h> 
boolean reading = false; 

//////////////////////////////////////////////////////////////////////// 
//CONFIGURE 
//////////////////////////////////////////////////////////////////////// 
    byte ip[] = { 192, 168, 178, 99 }; 
    //byte gateway[] = { 192, 168, 178, 1 }; 
    //byte subnet[] = { 255, 255, 255, 0 }; 
    byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; // if need to change the MAC address (Very Rare) 
    EthernetServer server = EthernetServer(80); //port 80 
    const int ledPin = 2; // LED Pin 
//////////////////////////////////////////////////////////////////////// 

void setup(){ 
    pinMode(ledPin, OUTPUT); //Pins 10,11,12 & 13 are used by the ethernet shield 
    digitalWrite(ledPin, LOW); 
    Ethernet.begin(mac); 
    server.begin(); 
} 

void loop(){ 
    checkForClient(); // listen for incoming clients, and process qequest. 
} 

void checkForClient(){ 
    EthernetClient client = server.available(); 
    if (client) { 

    // an http request ends with a blank line 
    boolean currentLineIsBlank = true; 
    boolean sentHeader = false; 

    while (client.connected()) { 
     if (client.available()) { 

     if(!sentHeader){ 
      // send a standard http response header 
      client.println("HTTP/1.1 200 OK"); 
      client.println("Content-Type: text/html"); 
      client.println(); 
      sentHeader = true; 
     } 

     char c = client.read(); 

     if(reading && c == ' ') reading = false; 
     if(c == '?') reading = true; //found the ?, begin reading the info 

     if(reading){ 
      switch (c) { 
      case 'on': 
       digitalWrite(ledPin, HIGH); 
       break; 
      case 'off': 
       digitalWrite(ledPin, LOW); 
       break; 
      } 

     } 

     if (c == '\n' && currentLineIsBlank) break; 

     if (c == '\n') { 
      currentLineIsBlank = true; 
     }else if (c != '\r') { 
      currentLineIsBlank = false; 
     } 

     } 
    } 

    delay(1); // give the web browser time to receive the data 
    client.stop(); // close the connection: 

    } 

} 

Answer 1

您的Arduino是否應答來自路由器的傳入ARP請求？似乎沒有，但它應該。