IP dynamique

//Mit Arduino version 1.0.6 getestet
// Arduino MEGA Ramverbrauch min 2152

#include <Ethernet.h>
#include <SPI.h>

/*
byte ip[] = {
10, 0, 0, 100 }; //Manual setup only
byte gateway[] = {
10, 0, 0, 138 }; //Manual setup only
byte subnet[] = {
255, 255, 255, 0 }; //Manual setup only
*/

// if need to change the MAC address (Very Rare)
byte mac[] = {
//0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
0xDE, 0x19, 0x8A, 0xEF, 0xFE, 0x07 };



EthernetClient client;
String lastip="";
String newip="";

unsigned long previousMillis = 15000;
const long interval = 15000;

void setup()
{
// stackoverflow.com/questions/33892704/eth...lying-the-correct-ip
// Maybe try letting your router provide an IP address via DHCP. To do that, just change the line in your setup routine to Ethernet.begin(mac);
Ethernet.begin(mac);
//Ethernet.begin(mac, ip, gateway, subnet);

Serial.begin(115200);

delay(1000);

//Serial.println("connecting...");
//ram_info();

//send_ip(client);

}

void loop()
{
unsigned long currentMillis = millis();

if(currentMillis - previousMillis >= interval) { // alle 15 Sekunden aufrufen

Serial.println("connecting...");
send_ip(client);


currentMillis = millis();
previousMillis = currentMillis;
}
delay(1000);
Serial.println((currentMillis - previousMillis)/1000); // Zeit
}


void send_ip(EthernetClient client) // forum.arduino.cc/index.php?topic=369600.0
{
if (client.connect("checkip.dyndns.org", 80)) { //starts client connection, checks for connection
Serial.println(F("connected"));
client.println(F("GET /api/p/realip.php HTTP/1.1")); //download text
client.println(F("Host: checkip.dyndns.org"));
client.println(F("Connection: close")); //close 1.1 persistent connection
client.println(); //end of get request
}
else {
Serial.println(F("\tconnection failed")); //error message if no client connect
client.stop();
return;
}

byte reed = 0; // umschalten von IP suchen auf IP einlesen

while(client.connected() && !client.available()) delay(1); //waits for data
while (client.connected() || client.available()) { //connected or data available
if (reed == 0 && client.find("IP Address: ")) { //alle Zeichen löschen bis "IP Address: " gefunden wurde im Antworttext der Webseite
reed = 1;
delay(1);
}
if (reed == 1) {
char c = client.read(); //gets byte from ethernet buffer
if (c == '<') { break; reed = 0; } //Erstes Zeichen nach der IP adresse
Serial.write(c);
newip += c; //places captured byte in readString
}
}
Serial.println("");
client.stop(); //stop client

if (newip == "") { //Abbrechen wenn keine IP gelesen wurde
Serial.println(F("\tIP nicht gefunden\n"));

//Serial.println(F("!!!")); // Upload nicht möglich wegen "!!!"
return;
}

if (lastip != newip ) // wenn lastip verschieden von newip ist
{
Serial.print(F("\tlastip= "));
Serial.println(lastip);
lastip="";
lastip = newip;
update_dtdns(client);
}

newip=""; //leert die Variable Readstring
}


void update_dtdns(EthernetClient client) //dtdns erneuern
{
client.connect("www.dtdns.com", 80) ;
//client.print(F("POST /api/autodns.cfm?id=yourdnsname.dtdns.net&pw=yourpassword&ip="));
client.print(F("POST /api/autodns.cfm?id=beispiel1234.b0ne.com&pw=123456789123&ip="));


client.println(lastip);
client.println();
client.stop();
Serial.println(F("client.stop"));
}