I'm collecting data using a web server with pages stored in the SD.
I copied a adapted a code found in Internet. However seems won't work. After few seconds the Link is lost. And I'm not able to ping Arduino
Any idea? Thank you
#include <SPI.h>
#include <Ethernet.h>
#include <SD.h>
#include <EEPROM.h>
//
int IP0 = EEPROM.read(0); // first IP octet
int IP1 = EEPROM.read(1);
int IP2 = EEPROM.read(2);
int IP3 = EEPROM.read(3);
int NT0 = EEPROM.read(4); // first octet netmask
int NT1 = EEPROM.read(5);
int NT2 = EEPROM.read(6);
int NT3 = EEPROM.read(7);
// size of buffer used to capture HTTP requests
#define REQ_BUF_SZ 20
// MAC address from Ethernet shield sticker under board
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[] = {IP0, IP1, IP2, IP3}; // IP address stored in the EEProm
byte subnet[] = {NT0, NT1, NT2, NT3};
//byte gateway[] = {GW0, GW1, GW2, GW3};
EthernetServer server(80); // create a server at port 80
File webFile; // handle to files on SD card
char HTTP_req[REQ_BUF_SZ] = {0}; // buffered HTTP request stored as null terminated string
char req_index = 0; // index into HTTP_req buffer
void setup()
{
// disable Ethernet chip
//pinMode(10, OUTPUT);
//digitalWrite(10, HIGH);
Serial.begin(9600); // for debugging
Ethernet.begin(mac, ip, subnet); // initialize Ethernet device
// initialize SD card
Serial.println("Initializing SD card...");
if (!SD.begin(4)) {
Serial.println("ERROR - SD card initialization failed!");
return; // init failed
}
Serial.println("SUCCESS - SD card initialized.");
// check for index.htm file
if (!SD.exists("index.htm")) {
Serial.println("ERROR - Can't find index.htm file!");
return; // can't find index file
}
Serial.println("SUCCESS - Found index.htm file.");
server.begin(); // start to listen for clients
Serial.println("IP Address:");
Serial.println(Ethernet.localIP());
}
void loop()
{
EthernetClient client = server.available(); // try to get client
if (client) { // got client?
Serial.println("new client");
bool currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
// client data available to read
char c = client.read(); // read 1 byte (character) from client
// buffer first part of HTTP request in HTTP_req array (string)
// leave last element in array as 0 to null terminate string (REQ_BUF_SZ - 1)
if (req_index < (REQ_BUF_SZ - 1)) {
HTTP_req[req_index] = c; // save HTTP request character
req_index++;
}
Serial.print(c); // print HTTP request character to serial monitor
// last line of client request is blank and ends with \n
// respond to client only after last line received
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("Connnection: close");
client.println();
// open requested web page file
if (StrContains(HTTP_req, "GET / ")
|| StrContains(HTTP_req, "GET /index.htm")) {
webFile = SD.open("index.htm"); // open web page file
}
if (StrContains(HTTP_req, "GET /set_data.htm")) {
webFile = SD.open("set_data.htm"); // open web page file
}
if (StrContains(HTTP_req, "GET /set_eth.htm")) {
webFile = SD.open("set_eth.htm"); // open web page file
}
if (StrContains(HTTP_req, "GET /index.htm")) {
webFile = SD.open("index.htm"); // open web page file
}
// send web page to client
if (webFile) {
while(webFile.available()) {
client.write(webFile.read());
}
webFile.close();
}
// reset buffer index and all buffer elements to 0
req_index = 0;
StrClear(HTTP_req, REQ_BUF_SZ);
break;
}
// every line of text received from the client ends with \r\n
if (c == '\n') {
// last character on line of received text
// starting new line with next character read
currentLineIsBlank = true;
}
else if (c != '\r') {
// a text character was received from client
currentLineIsBlank = false;
}
} // end if (client.available())
} // end while (client.connected())
delay(1); // give the web browser time to receive the data
client.stop();
Serial.println("client disconnected"); // close the connection
} // end if (client)
}
// sets every element of str to 0 (clears array)
void StrClear(char *str, char length)
{
for (int i = 0; i < length; i++) {
str[i] = 0;
}
}
// searches for the string sfind in the string str
// returns 1 if string found
// returns 0 if string not found
char StrContains(char *str, char *sfind)
{
char found = 0;
char index = 0;
char len;
len = strlen(str);
if (strlen(sfind) > len) {
return 0;
}
while (index < len) {
if (str[index] == sfind[found]) {
found++;
if (strlen(sfind) == found) {
return 1;
}
}
else {
found = 0;
}
index++;
}
return 0;
}
