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User avatar
By rajbadri
#17143 i am using a esp8266 with the example WifiWebServer example sketch and use gpio 2 to switch a relay on off which is connected to a 230 watts mains table lamp. the setup runs perfectly for about 2-3 days then the esp8266 loses connection to my router.
Even when the esp chip is not connected to the router The access point remains on and i can log into it
If i reboot my router than the esp8266 reconnects
I have also changed my router but the problem persists

Code: Select all/*
 *  This sketch demonstrates how to set up a simple HTTP-like server.
 *  The server will set a GPIO pin depending on the request
 *    http://server_ip/gpio/0 will set the GPIO2 low,
 *    http://server_ip/gpio/1 will set the GPIO2 high
 *  server_ip is the IP address of the ESP8266 module, will be
 *  printed to Serial when the module is connected.

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <IPAddress.h>

const char* ssid = "routerssid";
const char* password = "password";

// Create an instance of the server
// specify the port to listen on as an argument
WiFiServer server(80);

void setup() {

  // prepare GPIO2
  pinMode(2, OUTPUT);
  digitalWrite(2, 0);
  // Connect to WiFi network
  Serial.print("Connecting to ");
  WiFi.begin(ssid, password);
  WiFi.config(IPAddress(192,168,1,252), IPAddress(192,168,1,1), IPAddress(255,255,255,0)); //give fixed ip
  while (WiFi.status() != WL_CONNECTED) {
  Serial.println("WiFi connected");
  // Start the server
  Serial.println("Server started");

  // Print the IP address

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");
  // Read the first line of the request
  String req = client.readStringUntil('\r');
  // Match the request
  int val;
  if (req.indexOf("/gpio/0") != -1)
    val = 0;
  else if (req.indexOf("/gpio/1") != -1)
    val = 1;
  else {
    Serial.println("invalid request");

  // Set GPIO2 according to the request
  digitalWrite(2, val);

  // Prepare the response
  String s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r\nGPIO is now ";
  s += (val)?"high":"low";
  s += "</html>\n";

  // Send the response to the client
  Serial.println("Client disonnected");

  // The client will actually be disconnected
  // when the function returns and 'client' object is detroyed

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User avatar
By jh1995
#17214 Hello.
Might be related, might be not.

I faced the same problem with the ESP8266 calling an Internet webpage every 10 seconds after 16 hours or so. When I came home and tried logging into the AP with any other device the AP would not accept me. I had to reboot the AP/DSL router.
In my case the AP could have run out of resources after so many connections.

Now I have been running the same client for 3 days without a glitch. Data is uploaded every minute and I added client.stop(); before returning to the top of the main loop.

In theory the destroy function is called automatically at each loop cycle, but making it explicit really did help.