Hello everyone. I come from a small company in China. Now I have developed a small project. The code is as follows.
My question is: why this code will crash and trigger the watchdog program when executed only 65 to 66 times?
I use arduino Uno development board .
My English is not very good, I need help from friends urgently. Thank you all
#include <Ethernet.h>
#include <SPI.h>
#include <avr/wdt.h>
int pin[] = {2, 3, 4, 5, 6, 7, 8, 9, A0, A1, A2, A3, A4, A5};
bool state[14];
String value = "";
byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x02};
IPAddress ip(192, 168, 0, 31);
char cloudDn[] = "cloud.caffz.com";
char server[] = "www.caffz.com";
EthernetClient client;
void setup() {
Serial.begin(4800);
Serial.println("Hello CAFFZ!");
initialize();
wdt_enable(WDTO_8S);
}
void loop() {
for (int i = 0; i < sizeof(state) / sizeof(state[0]); i++) {
if (state[i]) {
value.concat('1');
} else {
value.concat('0');
}
}
request();
}
void initialize() {
String command = "";
for (int i = 0; i < sizeof(pin) / sizeof(pin[0]); i++) {
pinMode(pin[i], OUTPUT);
command.concat("0");
}
execute(command);
}
void execute(String command) {
for (int i = 0; i < command.length(); i++) {
if (command.charAt(i) == '0') {
digitalWrite(pin[i], LOW);
state[i] = false;
} else if (command.charAt(i) == '1') {
digitalWrite(pin[i], HIGH);
state[i] = true;
}
//Serial.print("No.");
//Serial.print(i + 1);
//Serial.print(" ");
//Serial.println(command.charAt(i));
}
}
void check() {
if (!Ethernet.begin(mac)) {
Ethernet.begin(mac, ip);
}
Serial.print("local IP: ");
Serial.println(Ethernet.localIP());
}
void request() {
check();
if (!client.connect(cloudDn, 12345)) {
String str = getCloudIp();
if (str != "") {
int num[4];
for (int i = 0; i < 4; i++) {
int idx = str.indexOf(".");
if (idx != -1) {
num[i] = str.substring(0, idx).toInt();
str = str.substring(idx + 1);
} else {
num[i] = str.toInt();
}
}
IPAddress cloudIp(num[0], num[1], num[2], num[3]);
if (!client.connect(cloudIp, 12345)) {
return;
}
} else {
return;
}
}
client.print("GET /smartfarm2/a2268.php?c=control&a=select&number=226.8.3.1.1-8&value=");
client.print(value);
client.println("&token=www.caffz.com HTTP/1.1");
client.println("Host: cloud.caffz.com");
client.println("Connection: keep-alive");
//client.println("Connection: close");
client.println();
unsigned long start = millis();
String reply = "";
int sign = 0;
while (true) {
while (client.available()) {
char c = client.read();
reply.concat(c);
if (c == ' ') {
if (sign == 0) {
if (reply.indexOf("200") != -1) {
sign = 1;
} else {
sign = -1;
}
} else if (sign == 1) {
if (reply == " ") {
sign = 2;
delay(500);
}
}
Serial.print(reply);
reply = "";
}
}
if (sign == 2 || millis() - start > 5000) {
break;
}
}
Serial.println(reply);
client.stop();
if (sign == 2) {
execute(reply);
wdt_reset();
}
}
String getCloudIp() {
if (client.connect(server, 80)) {
client.println("GET /czip/ip.php HTTP/1.1");
client.println("Host: www.caffz.com");
client.println("Connection: keep-alive");
//client.println("Connection: close");
client.println();
unsigned long start = millis();
String reply = "";
int sign = 0;
while (true) {
while (client.available()) {
char c = client.read();
reply.concat(c);
if (c == ' ') {
if (sign == 0) {
if (reply.indexOf("200") != -1) {
sign = 1;
} else {
sign = -1;
}
} else if (sign == 1) {
if (reply == " ") {
sign = 2;
delay(500);
}
}
Serial.print(reply);
reply = "";
}
}
if (sign == 2 || millis() - start > 5000) {
break;
}
}
Serial.print("cloud IP: ");
Serial.println(reply);
client.stop();
if (sign == 2) {
return reply;
}
}
return "";
}
