Change Ip address from HTML web server (

[Belce666]

Greetings to everyone. Please consider me a "NOOB" on this, so be patient

I have a project, i want to build a device that let me turn on/off devices remotly. So with an arduino uno R3 + ethernet shield (esp8266 based) i want to build a web server, with a basic authentication (usr/pass) and manage 2 relays; i have done that part, i have a functional device.

But now, i want to go for more, and im stuck. I want to change IP, MASK, Gateway and, occasionally the mac address,... and if I can user and password too, like a low price router o network device.

So i found some code on this forum, i just forgot the relay control part and im only triying to success with the IP change from the HTML code (web server). I have found the eeprom.h library, and a some code, but the post chance was closed (topic: 120 days old).

I will left the code i adapted and the error im receiving...

Sketch:

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

byte mac[] = { 0x54, 0x34, 0x41, 0x30, 0x30, 0x31 };
IPAddress ip(192, 168, 1, 250);
IPAddress subnet(255, 255, 254, 0);
IPAddress gateway(192, 168, 1, 1);


EthernetServer server(80);

void setup() {

ShieldSetup();
Ethernet.begin(mac, ip, gateway, subnet);
server.begin();
Serial.begin(9600);
  


}

void ShieldSetup() {
  int idcheck = EEPROM.read(0);

  if (idcheck != ID){

  }
  if (idcheck == ID){
    
    for (int i = 0; i < 4; i++){
      ip[i] = EEPROM.read(i+7);
    }
    for (int i = 0; i < 4; i++){
      subnet[i] = EEPROM.read(i+11);
    }
    for (int i = 0; i < 4; i++){
      gateway[i] = EEPROM.read(i+15);
    }
  }      
  Ethernet.begin(mac, ip);
}

void loop() {
 
      EthernetClient client = server.available();
      if (client) {
      TextFinder  finder(client );
      while (client.connected()) {     
      if (client.available()) {
       
        if( finder.find("GET /") ) {
         
          if (finder.findUntil("setup", "\n\r")){
           
          if (finder.findUntil("SBM", "\n\r")){
            byte SET = finder.getValue();
           
              while(finder.findUntil("DT", "\n\r")){
                int val = finder.getValue();
                // if val from "DT" is between 1 and 6 the according value must be a MAC value.
                if(val >= 1 && val <= 6) {
                  mac[val - 1] = finder.getValue();
                }
                // if val from "DT" is between 7 and 10 the according value must be a IP value.
                if(val >= 7 && val <= 10) {
                  ip[val - 7] = finder.getValue();
                }
                // if val from "DT" is between 11 and 14 the according value must be a MASK value.
                if(val >= 11 && val <= 14) {
                  subnet[val - 11] = finder.getValue();
                }
                // if val from "DT" is between 15 and 18 the according value must be a GW value.
                if(val >= 15 && val <= 18) {
                  gateway[val - 15] = finder.getValue();
                }
              }
            // Now that we got all the data, we can save it to EEPROM
            //for (int i = 0 ; i < 6; i++){
              //EEPROM.write(i + 1,mac[i]);
            //}
            for (int i = 0 ; i < 4; i++){
              EEPROM.write(i + 7, ip[i]);
            }
            for (int i = 0 ; i < 4; i++){
              EEPROM.write(i + 11, subnet[i]);
            }
            for (int i = 0 ; i < 4; i++){
              EEPROM.write(i + 15, gateway[i]);
            }
            EEPROM.write(0, 0x92);
           }
          // and from this point on, we can start building our setup page
          // and show it in the client's browser.
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println();
          for (int i = 0; i < 4; i++)
            {
            strcpy_P(buffer, (char*)pgm_read_word(&(string_table0[i])));
            client.print( buffer );
            }
          for (int i = 0; i < 3; i++)
            {
            strcpy_P(buffer, (char*)pgm_read_word(&(string_table1[i])));
            client.print( buffer );
            }
          client.print(mac[0],HEX);
          strcpy_P(buffer, (char*)pgm_read_word(&(string_table1[3])));
          client.print( buffer );
          client.print(mac[1],HEX);
          strcpy_P(buffer, (char*)pgm_read_word(&(string_table1[4])));
          client.print( buffer );
          client.print(mac[2],HEX);
          strcpy_P(buffer, (char*)pgm_read_word(&(string_table1[5])));
          client.print( buffer );
          client.print(mac[3],HEX);
          strcpy_P(buffer, (char*)pgm_read_word(&(string_table1[6])));
          client.print( buffer );
          client.print(mac[4],HEX);
          strcpy_P(buffer, (char*)pgm_read_word(&(string_table1[7])));
          client.print( buffer );
          client.print(mac[5],HEX);
          for (int i = 0; i < 4; i++)
            {
            strcpy_P(buffer, (char*)pgm_read_word(&(string_table2[i])));
            client.print( buffer );
            }
          client.print(ip[0],DEC);
          strcpy_P(buffer, (char*)pgm_read_word(&(string_table2[4])));
          client.print( buffer );
          client.print(ip[1],DEC);
          strcpy_P(buffer, (char*)pgm_read_word(&(string_table2[5])));
          client.print( buffer );
          client.print(ip[2],DEC);
          strcpy_P(buffer, (char*)pgm_read_word(&(string_table2[6])));
          client.print( buffer );
          client.print(ip[3],DEC);
          strcpy_P(buffer, (char*)pgm_read_word(&(string_table3[0])));
          client.print( buffer );
          client.print(subnet[0],DEC);
          strcpy_P(buffer, (char*)pgm_read_word(&(string_table3[1])));
          client.print( buffer );
          client.print(subnet[1],DEC);
          strcpy_P(buffer, (char*)pgm_read_word(&(string_table3[2])));
          client.print( buffer );
          client.print(subnet[2],DEC);
          strcpy_P(buffer, (char*)pgm_read_word(&(string_table3[3])));
          client.print( buffer );
          client.print(subnet[3],DEC);
          strcpy_P(buffer, (char*)pgm_read_word(&(string_table4[0])));
          client.print( buffer );
          client.print(gateway[0],DEC);
          strcpy_P(buffer, (char*)pgm_read_word(&(string_table4[1])));
          client.print( buffer );
          client.print(gateway[1],DEC);
          strcpy_P(buffer, (char*)pgm_read_word(&(string_table4[2])));
          client.print( buffer );
          client.print(gateway[2],DEC);
          strcpy_P(buffer, (char*)pgm_read_word(&(string_table4[3])));
          client.print( buffer );
          client.print(gateway[3],DEC);
          strcpy_P(buffer, (char*)pgm_read_word(&(string_table4[4])));
          client.print( buffer );
          for (int i = 0; i < 7; i++)
            {
            strcpy_P(buffer, (char*)pgm_read_word(&(string_table5[i])));
            client.print( buffer );
            }
          strcpy_P(buffer, (char*)pgm_read_word(&(string_table4[5])));
          client.print( buffer );
          client.println();
          client.println();
         
 (F("<tr><td><font color=\"red\" size=\"2\" 
face=\"Verdana\">&nbspYou can not change the MAC 
address</font></td></tr></table>
"));
      }}}}
    delay(1);
    client.stop();
  }
 }

Error (at least one of them): Marked on the line:

void ShieldSetup() {
  int idcheck = EEPROM.read(0);

  if (idcheck != ID){  <------ ERROR

'ID' was not declared in this scope

Maybe its an ambitious goal to me, (too high over my possibilities or skills, but but a guy says : "your only real obstacle is yourself", so thats why im posting... keep trying.

Thank you

[Klaus_K]

Welcome to the forum.

The errors tells you that the compiler does not know what ID means? Every variable need to be declared. For instance,

int value = 0;

tells the compiler create a variable of type integer and call it value. Now when you call

value = 5;

the compiler knows, that is the variable you declared earlier.

ID does not need to be a variable. It could be a constant. Constants are created by using #define.

#define value 5

Now you can use value instead of 5 but you cannot change it.

Scope is a concept that allows variable names to be reused under certain rules without creating conflict. For more details Google "C++ scope".

[countrypaul]

Do you have a link to where you got the code from as this may give us a clue as to what ID is or how it is defined?