Webserver not reachable after some time

Projects Networking, Protocols, and Devices
1

Hello all,

I am using 2 webservers at my home to control relays.
One of them is on Uno with etherenet shield, other is a wemos esp8266 wi-fi board.
I have the following issue with both: after some time the webservers are not reachable.
The IP connectivity is ok, they both answer to Ping, but webpage is not reachable.
Then it gets back working either if I reboot the boards or reboot the router.
It is very annoying when I want e.g to open my garage door in morning webpage is unreachable..
Does anyone have solution for similar issues?

Br,

2

Then it gets back working either if I reboot the boards or reboot the router.

Sounds like a router configured with a very low lease time. Try increasing the DHCP lease time on the router.

3

actually I am using static IP address for both boards (not by dhcp). And even when the web pages cannot be reached, both boards are answering to PING, so network connection is ok...

4

And you are sure that if the system is in the state that you cannot access the web page, a restart of the router (without touching the Arduinos) will make the web page accessible again?

5

Without showing the sketch, nobody - beside you - can check it.
Therefore - if you want to get assistance - post your well documented code.

6

pylon:
And you are sure that if the system is in the state that you cannot access the web page, a restart of the router (without touching the Arduinos) will make the web page accessible again?

Yes, this is the case!

7

Yes, here is 1 of my codes (this one is running on the wemos, actually it is used to switch 4 relays):

#include <ESP8266WiFi.h>
 
const char* ssid = "......";
const char* password = ".......";

int kapu1 = D2;
int villany1 = D5;
int kapu2 = D6;
int villany2 = D7;
String inString = String(50);

WiFiServer server(80);
IPAddress ip(192, 168, 1, 61); // where xx is the desired IP Address
IPAddress gateway(192, 168, 1, 254); // set gateway to match your network

void setup() {
  Serial.begin(115200);
  delay(10);
 
 
  pinMode(kapu1, OUTPUT);
  digitalWrite(kapu1, LOW);
  pinMode(villany1, OUTPUT);
  digitalWrite(villany1, LOW);
  pinMode(kapu2, OUTPUT);
  digitalWrite(kapu2, LOW);
  pinMode(villany2, OUTPUT);
  digitalWrite(villany2, LOW);

  
 
  Serial.print(F("Setting static ip to : "));
  Serial.println(ip);
 
  // Connect to WiFi network
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  IPAddress subnet(255, 255, 255, 0); // set subnet mask to match your network
  WiFi.config(ip, gateway, subnet); 
  WiFi.begin(ssid, password);
 
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
 
  // Start the server
  server.begin();
  Serial.println("Server started");
 
  // Print the IP address
  Serial.print("Use this URL : ");
  Serial.print("http://");
  Serial.print(WiFi.localIP());
  Serial.println("/");
 
}
 
void loop() {
  // Check if a client has connected
  WiFiClient client = server.available();
  
  
  if (client) {
    
  
 
  // Wait until the client sends some data
  Serial.println("new client");
 boolean current_line_is_blank = true;
  while (client.connected()) {

  if (client.available()) {

  
  char c = client.read();
   
  //Serial.write(c);
   if (inString.length() < 50) {
            inString.concat(c);
           
         }
 
 if (c == '\n' && current_line_is_blank) {

      Serial.println(inString);
 

  // Match the request
 

  if (inString.indexOf("b5") != -1) {
    digitalWrite(kapu1, HIGH);
   
    delay(1000);
    digitalWrite(kapu1, LOW);
    
    
    //itt kell a garazs 1 kaput felnyitni
    
  } 
  if (inString.indexOf("b6") != -1){

    digitalWrite(villany1, !digitalRead(villany1));

    Serial.println(digitalRead(villany1));
    
   
 //itt kell a garazs 1 villanyt felkapcsolni
    
  }

if (inString.indexOf("b7") != -1) {
     digitalWrite(kapu2, HIGH);
   
    delay(1000);
    digitalWrite(kapu2, LOW);
    //itt kell a garazs 2 kaput felnyitni
    
  } 

 if (inString.indexOf("b8") != -1) {

     digitalWrite(villany2, !digitalRead(villany2));


  Serial.println(digitalRead(villany2));
    //itt kell a garazs 2 villanyt felkapcsolni
    
  } 


//return HTTP response

          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println();
          client.println("<!DOCTYPE html PUBLIC \"-//WAPFORUM//DTD XHTML Mobile 1.0//EN\" \"http://www.wapforum.org/DTD/xhtml-mobile10.dtd\">");
         
          client.println("<html><body><h2>Garazs vezerlo</h2><font size= 4><form method=GET>");
          client.println("

<input type=submit name=b5 value=Garazskapu_1>");
          client.println("

<input type=submit name=b6 value=Garazs_1_villany>");
          client.println("

<input type=submit name=b7 value=Garazskapu_2>");
          client.println("

<input type=submit name=b8 value=Garazs_2_villany>");
          client.println("

<a href=\"http://192.168.1.250:19136/?pw=mypw\">Vissza a hazhoz</a>");

    break;
         
  }
  
  if (c == '\n') {
          // we're starting a new line
          current_line_is_blank = true;
        } else if (c != '\r') {
          // we've gotten a character on the current line
          current_line_is_blank = false;
        }

  }
  
  }

 
  delay(1);
   client.stop();
  Serial.println("Client disconnected");
  Serial.println("");
   inString = "";
 
}
 }
8

Yes, this is the case!

That means your router is the problem and not the Arduino or the ESP. It might be a firewall thing or some NAT stuff but I'm quite sure you won't have this problem if you connect the PC and the boards by a simple switch/access point.