Looping stops after serving web request?
Posted: Tue May 12, 2020 7:18 pmHello, this is my first post to the forum and I am new to the ESP8266 module. I'm using the Arduino IDE to try and get a web server going to display some web page and then do some other things. Unfortunately, it seems that once a client disconnects from the web server, no the void loop () stops looping for about 6 or 7 minutes! I can't seem to figure out why, and I've tried several different example scripts, but they all seem to have the same problem. Can anyone help figure this out? Here is my code, if you run it you will notice that after serving up the web page, it should go back to printing "Waiting" twice a second, but it does not:
#include <ESP8266WiFi.h>
const char* ssid = "TJNet-TPLink-5G";
const char* password = "helloterry";
WiFiServer server(81);
void setup()
{
Serial.begin(115200);
Serial.println();
Serial.printf("Connecting to %s ", ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
Serial.println(" connected");
server.begin();
Serial.printf("Web server started, open %s in a web browser\n", WiFi.localIP().toString().c_str());
}
// prepare a web page to be send to a client (web browser)
String prepareHtmlPage()
{
String htmlPage =
String("HTTP/1.1 200 OK\r\n") +
"Content-Type: text/html\r\n" +
"Connection: close\r\n" + // the connection will be closed after completion of the response
"Refresh: 5\r\n" + // refresh the page automatically every 5 sec
"\r\n" +
"<!DOCTYPE HTML>" +
"<html>" +
"Analog input: " + String(analogRead(A0)) +
"</html>" +
"\r\n";
return htmlPage;
}
void loop()
{
WiFiClient client = server.available();
// wait for a client (web browser) to connect
if (client)
{
Serial.println("\n[Client connected]");
while (client.connected())
{
// read line by line what the client (web browser) is requesting
if (client.available())
{
String line = client.readStringUntil('\r');
Serial.print(line);
// wait for end of client's request, that is marked with an empty line
if (line.length() == 1 && line[0] == '\n')
{
client.println(prepareHtmlPage());
break;
}
}
}
delay(1); // give the web browser time to receive the data
// close the connection:
client.stop();
Serial.println("[Client disonnected]");
}
Serial.println("Waiting...");
delay(500);
}
#include <ESP8266WiFi.h>
const char* ssid = "TJNet-TPLink-5G";
const char* password = "helloterry";
WiFiServer server(81);
void setup()
{
Serial.begin(115200);
Serial.println();
Serial.printf("Connecting to %s ", ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
Serial.println(" connected");
server.begin();
Serial.printf("Web server started, open %s in a web browser\n", WiFi.localIP().toString().c_str());
}
// prepare a web page to be send to a client (web browser)
String prepareHtmlPage()
{
String htmlPage =
String("HTTP/1.1 200 OK\r\n") +
"Content-Type: text/html\r\n" +
"Connection: close\r\n" + // the connection will be closed after completion of the response
"Refresh: 5\r\n" + // refresh the page automatically every 5 sec
"\r\n" +
"<!DOCTYPE HTML>" +
"<html>" +
"Analog input: " + String(analogRead(A0)) +
"</html>" +
"\r\n";
return htmlPage;
}
void loop()
{
WiFiClient client = server.available();
// wait for a client (web browser) to connect
if (client)
{
Serial.println("\n[Client connected]");
while (client.connected())
{
// read line by line what the client (web browser) is requesting
if (client.available())
{
String line = client.readStringUntil('\r');
Serial.print(line);
// wait for end of client's request, that is marked with an empty line
if (line.length() == 1 && line[0] == '\n')
{
client.println(prepareHtmlPage());
break;
}
}
}
delay(1); // give the web browser time to receive the data
// close the connection:
client.stop();
Serial.println("[Client disonnected]");
}
Serial.println("Waiting...");
delay(500);
}