noter:
Si funciona bien y deja de funcionar pasada una hora, así de primeras se me ocurre que puede ser que el cliente dejé de conectar, o que la memoria se llene.
Pin tu código y te podremos dar alguna idea para encontrar y tal vez corregir el problema.
Gracias por tu respuesta noter. Este es el código completo:
/*
Web client
This sketch connects to a website (http://www.google.com)
using an Arduino Wiznet Ethernet shield.
Circuit:
* Ethernet shield attached to pins 10, 11, 12, 13
created 18 Dec 2009
by David A. Mellis
modified 9 Apr 2012
by Tom Igoe, based on work by Adrian McEwen
*/
#include <SPI.h>
#include <Ethernet.h>
// Enter a MAC address for your controller below.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(74,125,232,128); // numeric IP for Google (no DNS)
char server[] = "https://mipaginaweb.com"; // name address for Google (using DNS)
unsigned long lastConnectionTime = 0; // last time you connected to the server, in milliseconds
const unsigned long postingInterval = 3L * 1000L; // delay between updates, in milliseconds
// the "L" is needed to use long type numbers
String sCode;
// Set the static IP address to use if the DHCP fails to assign
IPAddress ip(192, 168, 0, 177);
// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
EthernetClient client;
void Conectar(){
// start the Ethernet connection:
// give the Ethernet shield a second to initialize:
delay(1000);
client.stop();
//Serial.println("connecting...");
// if you get a connection, report back via serial:
if (client.connect(server, 80)) {
//Serial.println("connected");
// Make a HTTP request:
client.println("GET /prueba.php HTTP/1.1");
client.println("Host: mipaginaweb.com");
client.println("Connection: close");
client.println();
lastConnectionTime = millis();
} else {
// if you didn't get a connection to the server:
//Serial.println("connection failed");
}
}
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
pinMode(8, OUTPUT);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
if (Ethernet.begin(mac) == 0) {
Serial.println("Failed to configure Ethernet using DHCP");
// try to congifure using IP address instead of DHCP:
Ethernet.begin(mac, ip);
}
Conectar();
}
void loop() {
// if there are incoming bytes available
// from the server, read them and print them:
if (client.available()) {
char c = client.read();
sCode += c;
//Serial.print(c);
}
// if the server's disconnected, stop the client:
if (!client.connected()) {
//Serial.println("disconnecting.");
client.stop();
if (sCode != ""){
int pos_ini=sCode.indexOf("[DATA]");
if (pos_ini>=0) {
int pos_fin = sCode.indexOf("[/DATA]",pos_ini);
if (pos_fin>=0) {
String sDatos = sCode.substring(pos_ini + 6,pos_fin);
String sValor = sDatos.substring(8,9);
if (sValor == "1"){
digitalWrite(8, HIGH);
}
else
{
digitalWrite(8, LOW);
}
}
}
else
{
Serial.println("==================================================");
Serial.println(sCode);
Serial.println("==================================================");
Serial.println(pos_ini);
Serial.println("==================================================");
}
sCode = "";
}
}
if (millis() - lastConnectionTime > postingInterval) {
Conectar();
}
}
Como puedes ver el último else se ejecuta cuando no encuentra [DATA] y me imprime en el monitor tanto el contenido de la variable sCode como el valor de pos_ini y puedo ver que si está [DATA] en la variable y sigue siendo -1 el resultado. No es problema de conexión con la página porque si devuelve todo el código correctamente, tiene que ser problema del arduino. Uso arduino Leonardo.