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Hier mein aktueller Code

#include <SPI.h>  //Anbindung microcontroller an Ethernet-Shield
#include <Ethernet.h>
#include <WString.h>
#include <Client.h>
#include <Server.h>
int LED =4;
boolean testdiode=false;

// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
byte ip[] = { 192,168,1, 190 };

// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(80);
String readString = String(100);      // string for fetching data from address





void setup(){
  Ethernet.begin(mac, ip);  //Start der Ethernet-Verbindung und des Servers
  server.begin();
    pinMode(4, OUTPUT); 
    Serial.begin(9600);
}

void loop(){

  // listen for incoming clients
EthernetClient client = server.available(); //Client Verbindung herstellen
  if (client) {
    // an http request ends with a blank line
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        if (readString.length()< 100){
          readString = readString + c;
        }
        Serial.print(c);
          // if you've gotten to the end of the line (received a newline
        // character) and the line is blank, the http request has ended,
        // so you can send a reply
        if (c == '\n' && currentLineIsBlank) {
          // send a standard http response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println();
          // print something, in HTML format:
        }
        else if (c == '\n') {
			if(readString.indexOf("diode=AN") > -1) {
			   togglediode; // verändert den status von testdiode
                        }
                        if(readString.indexOf("diode=AUS") > -1) {
			   togglediode; // verändert den status von testdiode
                        }
                        

			   
          
          
           client.println("<html>");
           client.println("<head>");
            client.println("<TITLE>Sörens Testpage</TITLE>");
           client.println("</head>");
           client.println("<body>");

           
            /*
             if (testdiode==true) {
		     client.println("<input type=submit value=AN  name=3 style=width:200;height:100;background-color:lightgreen;/>");
                     client.println("<input type=\'hidden\' name='anderung' value='AUS'> ");
		 }else if (testdiode==false) {
		     client.println("<input type=submit  value=AUS name=3 style=width:200;height:100;background-color:red;/>");
                     client.println("<input type=\'hidden\' name='anderung' value='AN'> ");
		 }
           */
           
                     if (testdiode==false) {
		      client.println(" <form action='/' method='get'><input type=submit name=3 value='einschalten'> ");
                      client.println(" <input type='hidden' name='diode' value='AN'> ");
                      client.println(" </form> ");

                  
		 }
                   else if (testdiode==true) {
		     client.println(" <form action='/' method=get><input type=submit name=3 value='ausschalten'> ");
                     client.println(" <input type='hidden' name='diode' value='AUS'> ");
                      client.println(" </form> ");

  
  
		 }
           
           client.println("</body>");
           client.println("</html>");



          break;
        }
        if (c == '\n') {
          // you're starting a new line
          currentLineIsBlank = true;
        }
        else if (c != '\r') {
          // you've gotten a character on the current line
          currentLineIsBlank = false;
        }
      }
    }

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

}

void togglediode (){
   if (testdiode == false){
     testdiode=true;
     digitalWrite(LED, HIGH);
   } 
   else {
     testdiode=false;  
     digitalWrite(LED, LOW);
   }
}

Wenn ich den Button "einschalten" drücke steht Folgendes in der Adressleiste
" http://192.168.1.190/?3=einschalten&diode=AN "
Jedoch bleibt der LED status unverändert.

Wenn ich auf der Seite "http://192.168.1.190/ " den Befehl "diode=AN" anhänge, passiert das selbe.

Seriell wird ausgegeben:
GET /?3=einschalten&diode=AN HTTP/1.1
GET /?3=einschalten&diode=AN HTTP/1.1

Ich vermute an dieser Stelle, das das Suchen von diode=AN im String nicht funktioniert.
Kann mir allerdings nicht erklären warum nicht.