ESP12E Soft WDT reset stack trace leads to libraries

Question

Im using ESP12E DevKit v2 (esp8266 wifi module) board for controlling relays and displaying DHT22 temp,humidity on web server. It runs smoothly when the web client is closed but when i leave the website on for like a 20mins it crashes. I have installed the ESPdecoder and the stack trace always leads mostly to libraries. I tried using ESP.wdtDisable(); ESP.wdtEnable(WDTO_8S); commands and yield(); function but doesnt make any difference.

How can i fix this or what am i doing wrong in the code?

Soft WDT reset

>>>stack>>>

ctx: sys
sp: 3fffed40 end: 3fffffb0 offset: 01b0
3fffeef0:  3ffe93dc c84524b8 60000600 4020ea06  
3fffef00:  00000000 3ffeda08 00000000 00000000  
3fffef10:  4022d488 3ffeda08 3ffee9c0 60000600  
3fffef20:  4022fdd1 3ffeda08 3ffee9c0 c84550ad  
3fffef30:  4022fe16 3fffdab0 00000000 3fffdcb0  
3fffef40:  3ffee9d0 3fffdab0 00000000 40206223  
3fffef50:  40000f49 40000f49 3fffdab0 40000f49  
3fffef60:  40000e19 40001878 00000002 00000000  
3fffef70:  3fffff10 aa55aa55 000000f0 40104ba0  
3fffef80:  40104ba6 00000002 00000000 3715d4f6  
3fffef90:  4010000d 0e060f10 942b6d57 69e0d507  
3fffefa0:  40100b40 3fffef3c 40100aed 3ffffea8  
3fffefb0:  3fffffc0 00000000 00000000 feefeffe  
3fffefc0:  feefeffe feefeffe feefeffe feefeffe  
3fffefd0:  feefeffe feefeffe feefeffe feefeffe  
3fffefe0:  feefeffe feefeffe feefeffe feefeffe  
3fffeff0:  feefeffe feefeffe feefeffe feefeffe  
3ffff000:  feefeffe feefeffe feefeffe feefeffe  
3ffff010:  feefeffe feefeffe feefeffe feefeffe  
3ffff020:  feefeffe feefeffe feefeffe feefeffe  
3ffff030:  feefeffe feefeffe feefeffe feefeffe  
3ffff040:  feefeffe feefeffe feefeffe feefeffe  
3ffff050:  feefeffe feefeffe feefeffe feefeffe  
3ffff060:  feefeffe feefeffe feefeffe feefeffe  
3ffff070:  feefeffe feefeffe feefeffe feefeffe  
3ffff080:  feefeffe feefeffe feefeffe feefeffe  
3ffff090:  feefeffe feefeffe feefeffe feefeffe  
3ffff0a0:  feefeffe feefeffe feefeffe feefeffe  
3ffff0b0:  feefeffe feefeffe feefeffe feefeffe  
3ffff0c0:  feefeffe feefeffe feefeffe feefeffe  
3ffff0d0:  feefeffe feefeffe feefeffe feefeffe  
3ffff0e0:  feefeffe feefeffe feefeffe feefeffe  
3ffff0f0:  feefeffe feefeffe feefeffe feefeffe  
3ffff100:  feefeffe feefeffe feefeffe feefeffe  
3ffff110:  feefeffe feefeffe feefeffe feefeffe  
3ffff120:  feefeffe feefeffe feefeffe feefeffe  
3ffff130:  feefeffe feefeffe feefeffe feefeffe  
3ffff140:  feefeffe feefeffe feefeffe feefeffe  
3ffff150:  feefeffe feefeffe feefeffe feefeffe  
3ffff160:  feefeffe feefeffe feefeffe feefeffe  
3ffff170:  feefeffe feefeffe feefeffe feefeffe  
3ffff180:  feefeffe feefeffe feefeffe feefeffe  
3ffff190:  feefeffe feefeffe feefeffe feefeffe  
3ffff1a0:  feefeffe feefeffe feefeffe feefeffe  
3ffff1b0:  feefeffe feefeffe feefeffe feefeffe  
3ffff1c0:  feefeffe feefeffe feefeffe feefeffe  
3ffff1d0:  feefeffe feefeffe feefeffe feefeffe  
3ffff1e0:  feefeffe feefeffe feefeffe feefeffe  
3ffff1f0:  feefeffe feefeffe feefeffe feefeffe  
3ffff200:  feefeffe feefeffe feefeffe feefeffe  
3ffff210:  feefeffe feefeffe feefeffe feefeffe  
3ffff220:  feefeffe feefeffe feefeffe feefeffe  
3ffff230:  feefeffe feefeffe feefeffe feefeffe  
3ffff240:  feefeffe feefeffe feefeffe feefeffe  
3ffff250:  feefeffe feefeffe feefeffe feefeffe  
3ffff260:  feefeffe feefeffe feefeffe feefeffe  
3ffff270:  feefeffe feefeffe feefeffe feefeffe  
3ffff280:  feefeffe feefeffe feefeffe feefeffe  
3ffff290:  feefeffe feefeffe feefeffe feefeffe  
3ffff2a0:  feefeffe feefeffe feefeffe feefeffe  
3ffff2b0:  feefeffe feefeffe feefeffe feefeffe  
3ffff2c0:  feefeffe feefeffe feefeffe feefeffe  
3ffff2d0:  feefeffe feefeffe feefeffe feefeffe  
3ffff2e0:  feefeffe feefeffe feefeffe feefeffe  
3ffff2f0:  feefeffe feefeffe feefeffe feefeffe  
3ffff300:  feefeffe feefeffe feefeffe feefeffe  
3ffff310:  feefeffe feefeffe feefeffe feefeffe  
3ffff320:  feefeffe feefeffe feefeffe feefeffe  
3ffff330:  feefeffe feefeffe feefeffe feefeffe  
3ffff340:  feefeffe feefeffe feefeffe feefeffe  
3ffff350:  feefeffe feefeffe feefeffe feefeffe  
3ffff360:  feefeffe feefeffe feefeffe feefeffe  
3ffff370:  feefeffe feefeffe feefeffe feefeffe  
3ffff380:  feefeffe feefeffe feefeffe feefeffe  
3ffff390:  feefeffe feefeffe feefeffe feefeffe  
3ffff3a0:  feefeffe feefeffe feefeffe feefeffe  
3ffff3b0:  feefeffe feefeffe feefeffe feefeffe  
3ffff3c0:  feefeffe feefeffe feefeffe feefeffe  
3ffff3d0:  feefeffe feefeffe feefeffe feefeffe  
3ffff3e0:  feefeffe feefeffe feefeffe feefeffe  
3ffff3f0:  feefeffe feefeffe feefeffe feefeffe  
3ffff400:  feefeffe feefeffe feefeffe feefeffe  
3ffff410:  feefeffe feefeffe feefeffe feefeffe  
3ffff420:  feefeffe feefeffe feefeffe feefeffe  
3ffff430:  feefeffe feefeffe feefeffe feefeffe  
3ffff440:  feefeffe feefeffe feefeffe feefeffe  
3ffff450:  feefeffe feefeffe feefeffe feefeffe  
3ffff460:  feefeffe feefeffe feefeffe feefeffe  
3ffff470:  feefeffe feefeffe feefeffe feefeffe  
3ffff480:  feefeffe feefeffe feefeffe feefeffe  
3ffff490:  feefeffe feefeffe feefeffe feefeffe  
3ffff4a0:  feefeffe feefeffe feefeffe feefeffe  
3ffff4b0:  feefeffe feefeffe feefeffe feefeffe  
3ffff4c0:  feefeffe feefeffe feefeffe feefeffe  
3ffff4d0:  feefeffe feefeffe feefeffe feefeffe  
3ffff4e0:  feefeffe feefeffe feefeffe feefeffe  
3ffff4f0:  feefeffe feefeffe feefeffe feefeffe  
3ffff500:  feefeffe feefeffe feefeffe feefeffe  
3ffff510:  feefeffe feefeffe feefeffe feefeffe  
3ffff520:  feefeffe feefeffe feefeffe feefeffe  
3ffff530:  feefeffe feefeffe feefeffe feefeffe  
3ffff540:  feefeffe feefeffe feefeffe feefeffe  
3ffff550:  feefeffe feefeffe feefeffe feefeffe  
3ffff560:  feefeffe feefeffe feefeffe feefeffe  
3ffff570:  feefeffe feefeffe feefeffe feefeffe  
3ffff580:  feefeffe feefeffe feefeffe feefeffe  
3ffff590:  feefeffe feefeffe feefeffe feefeffe  
3ffff5a0:  feefeffe feefeffe feefeffe feefeffe  
3ffff5b0:  feefeffe feefeffe feefeffe feefeffe  
3ffff5c0:  feefeffe feefeffe feefeffe feefeffe  
3ffff5d0:  feefeffe feefeffe feefeffe feefeffe  
3ffff5e0:  feefeffe feefeffe feefeffe feefeffe  
3ffff5f0:  feefeffe feefeffe feefeffe feefeffe  
3ffff600:  feefeffe feefeffe feefeffe feefeffe  
3ffff610:  feefeffe feefeffe feefeffe feefeffe  
3ffff620:  feefeffe feefeffe feefeffe feefeffe  
3ffff630:  feefeffe feefeffe feefeffe feefeffe  
3ffff640:  feefeffe feefeffe feefeffe feefeffe  
3ffff650:  feefeffe feefeffe feefeffe feefeffe  
3ffff660:  feefeffe feefeffe feefeffe feefeffe  
3ffff670:  feefeffe feefeffe feefeffe feefeffe  
3ffff680:  feefeffe feefeffe feefeffe feefeffe  
3ffff690:  feefeffe feefeffe feefeffe feefeffe  
3ffff6a0:  feefeffe feefeffe feefeffe feefeffe  
3ffff6b0:  feefeffe feefeffe feefeffe feefeffe  
3ffff6c0:  feefeffe feefeffe feefeffe feefeffe  
3ffff6d0:  feefeffe feefeffe feefeffe feefeffe  
3ffff6e0:  feefeffe feefeffe feefeffe feefeffe  
3ffff6f0:  feefeffe feefeffe feefeffe feefeffe  
3ffff700:  feefeffe feefeffe feefeffe feefeffe  
3ffff710:  feefeffe feefeffe feefeffe feefeffe  
3ffff720:  feefeffe feefeffe feefeffe feefeffe  
3ffff730:  feefeffe feefeffe feefeffe feefeffe  
3ffff740:  feefeffe feefeffe feefeffe feefeffe  
3ffff750:  feefeffe feefeffe feefeffe feefeffe  
3ffff760:  feefeffe feefeffe feefeffe feefeffe  
3ffff770:  feefeffe feefeffe feefeffe feefeffe  
3ffff780:  feefeffe feefeffe feefeffe feefeffe  
3ffff790:  feefeffe feefeffe feefeffe feefeffe  
3ffff7a0:  feefeffe feefeffe feefeffe feefeffe  
3ffff7b0:  feefeffe feefeffe feefeffe feefeffe  
3ffff7c0:  feefeffe feefeffe feefeffe feefeffe  
3ffff7d0:  feefeffe feefeffe feefeffe feefeffe  
3ffff7e0:  feefeffe feefeffe feefeffe feefeffe  
3ffff7f0:  feefeffe feefeffe feefeffe feefeffe  
3ffff800:  feefeffe feefeffe feefeffe feefeffe  
3ffff810:  feefeffe feefeffe feefeffe feefeffe  
3ffff820:  feefeffe feefeffe feefeffe feefeffe  
3ffff830:  feefeffe feefeffe feefeffe feefeffe  
3ffff840:  feefeffe feefeffe feefeffe feefeffe  
3ffff850:  feefeffe feefeffe feefeffe feefeffe  
3ffff860:  feefeffe feefeffe feefeffe feefeffe  
3ffff870:  feefeffe feefeffe feefeffe feefeffe  
3ffff880:  feefeffe feefeffe feefeffe feefeffe  
3ffff890:  feefeffe feefeffe feefeffe feefeffe  
3ffff8a0:  feefeffe feefeffe feefeffe feefeffe  
3ffff8b0:  feefeffe feefeffe feefeffe feefeffe  
3ffff8c0:  feefeffe feefeffe feefeffe feefeffe  
3ffff8d0:  feefeffe feefeffe feefeffe feefeffe  
3ffff8e0:  feefeffe feefeffe feefeffe feefeffe  
3ffff8f0:  feefeffe feefeffe feefeffe feefeffe  
3ffff900:  feefeffe feefeffe feefeffe feefeffe  
3ffff910:  feefeffe feefeffe feefeffe feefeffe  
3ffff920:  feefeffe feefeffe feefeffe feefeffe  
3ffff930:  feefeffe feefeffe feefeffe feefeffe  
3ffff940:  feefeffe feefeffe feefeffe feefeffe  
3ffff950:  feefeffe feefeffe feefeffe feefeffe  
3ffff960:  feefeffe feefeffe feefeffe feefeffe  
3ffff970:  feefeffe feefeffe feefeffe feefeffe  
3ffff980:  feefeffe feefeffe feefeffe feefeffe  
3ffff990:  feefeffe feefeffe feefeffe feefeffe  
3ffff9a0:  feefeffe feefeffe feefeffe feefeffe  
3ffff9b0:  feefeffe feefeffe feefeffe feefeffe  
3ffff9c0:  feefeffe feefeffe feefeffe feefeffe  
3ffff9d0:  feefeffe feefeffe feefeffe feefeffe  
3ffff9e0:  feefeffe feefeffe feefeffe feefeffe  
3ffff9f0:  feefeffe feefeffe feefeffe feefeffe  
3ffffa00:  feefeffe feefeffe feefeffe feefeffe  
3ffffa10:  feefeffe feefeffe feefeffe feefeffe  
3ffffa20:  feefeffe feefeffe feefeffe feefeffe  
3ffffa30:  feefeffe feefeffe feefeffe feefeffe  
3ffffa40:  feefeffe feefeffe feefeffe feefeffe  
3ffffa50:  feefeffe feefeffe feefeffe feefeffe  
3ffffa60:  feefeffe feefeffe feefeffe feefeffe  
3ffffa70:  00000000 00000000 0000001f 40105379  
3ffffa80:  4000050c feefeffe feefeffe feefeffe  
3ffffa90:  40222216 00000030 00000010 ffffffff  
3ffffaa0:  40218973 3fff0884 00000000 00000000  
3ffffab0:  00000a43 00000000 00000a43 3fff07b4  
3ffffac0:  00000a43 00000000 00000020 000000fd  
3ffffad0:  00000005 00000000 00000020 40101696  
3ffffae0:  3ffe96b5 40104a97 3ffed118 40101696  
3ffffaf0:  401023ad 3ffed118 3ffed118 40101696  
3ffffb00:  00000005 00000000 00000020 40101696  
3ffffb10:  3ffe96b5 40104a97 3ffed0f0 4010257e  
3ffffb20:  00000002 00000000 00000020 40101696  
3ffffb30:  3ffe96b2 40104a7c 3ffece48 4010257e  
3ffffb40:  00000001 40103c9f 3ffed878 00000001  
3ffffb50:  40104102 c047a314 401029be 00000100  
3ffffb60:  00000000 00000000 0000001f 40105379  
3ffffb70:  40103be6 00000023 7fffffff 00000002  
3ffffb80:  00000123 3ffed118 3ffe9801 00000008  
3ffffb90:  40102a5b 00080000 3ffedb88 4010257e  
3ffffba0:  00000000 00000000 00002200 4000050c  
3ffffbb0:  3fffc278 40102758 3fffc200 00000022  
3ffffbc0:  3ffffbd0 3ffe9f6c 3ffe9f6c 00000001  
3ffffbd0:  4021bddb 00000030 00000010 ffffffff  
3ffffbe0:  4021bddb 00000001 00000000 0000c005  
3ffffbf0:  0000024e 00000001 ffff7f72 0000888e  
3ffffc00:  000005e0 00000020 401038a1 3ffed830  
3ffffc10:  0000013a 00000000 3fff0c70 000000fd  
3ffffc20:  0000005a 00000001 401049e2 3ffed830  
3ffffc30:  00000000 00000000 00000020 40101696  
3ffffc40:  3ffe96b0 40104a7c 3fff034c 3ffed830  
3ffffc50:  00000001 40103c9f 3ffed830 40101696  
3ffffc60:  40104102 00040000 40229be3 00000001  
3ffffc70:  ffffffff 00000000 3ffe9801 00000008  
3ffffc80:  40229c32 3ffecdd0 3ffefa4c 00000001  
3ffffc90:  40229d3e 3ffecdd0 3ffefa4c 3ffecdd0  
3ffffca0:  00000002 00000000 00000020 40101696  
3ffffcb0:  3ffe96b2 40228cef 3ffecdd0 3fff0c54  
3ffffcc0:  00000000 4021bf97 3ffee2d8 40105379  
3ffffcd0:  00000000 00000002 00000000 3ffecdd0  
3ffffce0:  3fff1882 4010511f 3fff0c54 3fff01dc  
3ffffcf0:  3fff184c 0000002f 00000000 00000001  
3ffffd00:  00000004 4020e2d9 3ffef418 3fff01dc  
3ffffd10:  3fff1882 00000045 00000001 3ffeefc8  
3ffffd20:  3fffff20 3fffff20 0000000a 00000000  
3ffffd30:  3ffef83c 3ffef804 3fff184c 4020e55b  
3ffffd40:  00000002 3ffef804 3fff184c 4020e94c  
3ffffd50:  3ffef6a8 4bc6a7f0 94bc6a7f 00000001  
3ffffd60:  00000001 00000000 4bc6a7f0 3ffef6ac  
3ffffd70:  3ffef83c 00000003 3ffef804 40216024  
3ffffd80:  00000000 3ffee998 8d04d0fb 00000000  
3ffffd90:  00000002 3fff184c 3ffef294 00000000  
3ffffda0:  3ffee9c0 3ffef294 3ffe851c 3fff184c  
3ffffdb0:  00000001 4bc6a7f0 deb851eb 00000001  
3ffffdc0:  00000001 00000000 4bc6a7f0 00000000  
3ffffdd0:  3ffef2bc 000001d3 000001d3 40100664  
3ffffde0:  00000001 00000000 3fff0774 40100aa8  
3ffffdf0:  3b172b21 000001d3 3ffe851c 4020e175  
3ffffe00:  00000001 3ffffe8f 40206268 402036f7  
3ffffe10:  00000001 00000000 3fff0774 40203e3f  
3ffffe20:  00000002 3ffffeae 3fff0774 40203ec5  
3ffffe30:  00000001 4bc6a7f0 8083126e 3fffff40  
3ffffe40:  00000030 0000000a 3fffff40 402057ed  
3ffffe50:  3ffffe8f 000001d3 000001d3 40100664  
3ffffe60:  00000001 4bc6a7f0 3c6a7efa 00000001  
3ffffe70:  00000001 00000000 4bc6a7f0 00000000  
3ffffe80:  00000001 00000000 401001c0 00334411  
3ffffe90:  00000000 000001d3 000001d3 40100664  
3ffffea0:  3b46b3ee 00000000 3ffe851c 00000000  
3ffffeb0:  00000002 3ffe9259 40206268 3fffefa0  
3ffffec0:  00000002 00000000 3fff0774 40203e73  
3ffffed0:  0000000b 00000000 3fff0774 40203ec5  
3ffffee0:  3fffff40 3fe0004f 3fff0774 41cccccd  
3ffffef0:  423c999a 00000000 3fffff40 402057ed  
3fffff00:  3ffe9259 3ffef020 3fffff40 402057ed  
3fffff10:  3ffe8be4 3ffef020 3fffff40 40205818  
3fffff20:  423c999a 3ffef020 3fffff40 40205864  
3fffff30:  429a0000 3ffef020 3ffef03c 40202cc9  
3fffff40:  40206988 00000000 00001388 40206738  
3fffff50:  00000000 3fff0774 00000000 00000000  
3fffff60:  00000000 00000000 00000000 00000000  
3fffff70:  3fff0ccc 0000007f 00000000 feefeffe  
3fffff80:  429c28f6 00000000 42473333 feefeffe  
3fffff90:  00000000 00000000 00000001 3ffef238  
3fffffa0:  3fffdad0 00000000 3ffef208 40206314  
<<<stack<<<

 ets Jan  8 2013,rst cause:2, boot mode:(3,7)

My code:

#include <ESP8266WiFi.h>
#include <DHT.h>
#include <NTPClient.h>
#include <WiFiUdp.h>
#define DHTTYPE DHT22

const char* ssid = "ID";
const char* password = "pass";
const char* ssid2 = "ID2";
const char* password2 = "pass2";

// Define NTP Client to get time
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP);

WiFiServer server(80); // Set web server port number to 80
String header; // Variable to store the HTTP request

// Decode HTTP GET value
String valueString = "0";
int pos1 = 0;
int pos2 = 0;

// Variables to store the current output state
int relay0State = 0;
int relay1State = 0;
int relay2State = 0;
String brightness = "0";

// Variables to save date and time
String formattedDate;
String dayStamp;
String timeStamp;

// Variables assigned to pins
const int relay0 = 16;
const int relay1 = 5;
const int relay2 = 4;
const int DHT1Pin = 0;
const int DHT2Pin = 2;

// Initialize DHT sensors
DHT dht1(DHT1Pin, DHTTYPE);
DHT dht2(DHT2Pin, DHTTYPE);

void setup() {
  //Watchdog timer settings
  ESP.wdtDisable();
  ESP.wdtEnable(WDTO_8S); 

  Serial.begin(115200);
  // Initialize the output variables as outputs
  pinMode(relay0, OUTPUT);
  pinMode(relay1, OUTPUT);
  pinMode(relay2, OUTPUT);
  // Set outputs to LOW
  digitalWrite(relay0, LOW);
  digitalWrite(relay1, LOW);
  digitalWrite(relay2, LOW);

  dht1.begin();
  dht2.begin();

  // Connect to available Wi-Fi network with SSID and password
  Serial.print("Connecting to ");
  int n = WiFi.scanNetworks();
  if (n == 0)
    Serial.println("No networks found!");
  else {
    for(int i=0;i<n;i++) {
      if(WiFi.SSID(i)==ssid) {
        WiFi.begin(ssid,password);
        ssid = ssid;
      } else if (WiFi.SSID(i)== ssid2) {
        WiFi.begin(ssid2,password2);
        ssid = ssid2;
      } 
    }
  }
  Serial.println(ssid);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  // Print local IP address and start web server
  Serial.println("");
  Serial.println("WiFi CONNECTED with IP: ");
  Serial.println(WiFi.localIP());
  server.begin();
  timeClient.begin(); // Initialize a NTPClient to get time
  timeClient.setTimeOffset(7200); // Setting offset time in seconds to adjust for current timezone -> GMT +1 = 3600
}

void loop(){
  ESP.wdtFeed(); //Feed the watchdog timer
  WiFiClient client = server.available();   // Listen for incoming clients

   while(!timeClient.update()) {
    timeClient.forceUpdate();
  }
  formattedDate = timeClient.getFormattedDate(); // The formattedDate comes with the following format 2018-05-28T16:00:13Z
  // Extract date
  int splitT = formattedDate.indexOf("T");
  dayStamp = formattedDate.substring(0, splitT);
  // Extract time
  timeStamp = formattedDate.substring(splitT+1, formattedDate.length()-1);

  if (client) {                             
    String currentLine = "";               // String to hold incoming data from the client
    while (client.connected()) {           // loop while the client's connected
      if (client.available()) {            // if there's bytes to read from the client,
        char c = client.read();            // read a byte, then
        header += c;
        if (c == '\n') {                    // if the byte is a newline character
                                            // if the current line is blank, you got two newline characters in a row. That's the end of the client HTTP request, so send a response:
          if (currentLine.length() == 0) {
            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
            // and a content-type so the client knows what's coming, then a blank line:
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println("Connection: close");
            client.println();

            // Read humidity 
            float h1 = dht1.readHumidity();
            float h2 = dht2.readHumidity();
            // Read temperature as Celsius (the default)
            float t1 = dht1.readTemperature();
            float t2 = dht2.readTemperature();
            // Read temperature as Fahrenheit (isFahrenheit = true)
            float f1 = dht1.readTemperature(true);
            float f2 = dht2.readTemperature(true);

            // Calculating average temp and humidity from DHT22 sensors
            float temperature = (t1 + t2)/2;
            float temperaturef = (f1 + f2)/2;
            float humidity = (h1 + h2)/2;

            if(header.indexOf("GET /1/") | header.indexOf("GET /0/") < 0){
                if(humidity < 50){
                relay1State = 1;
                digitalWrite(relay1, HIGH);
              } else {
                relay1State = 0;
                digitalWrite(relay1, LOW);
              }
              if(temperature < 23) {
                relay0State = 1;
                digitalWrite(relay0, HIGH);
              } else {
                relay0State = 0;
                digitalWrite(relay0, LOW);
              }
            }

            if (header.indexOf("GET /0/on") >= 0) {
              relay0State = 1;
              digitalWrite(relay0, HIGH);
            } else if (header.indexOf("GET /0/off") >= 0) {
              relay0State = 0;
              digitalWrite(relay0, LOW);
            } else if (header.indexOf("GET /1/on") >= 0) {
              relay1State = 1;
              digitalWrite(relay1, HIGH);
            } else if (header.indexOf("GET /1/off") >= 0) {
              relay1State = 0;
              digitalWrite(relay1, LOW);
            }

            // Display the HTML web page
            client.println("<!DOCTYPE html><html>");
            client.println("<head><meta http-equiv=\"refresh\" content=\"1\" name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
            client.println("<script src=\"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js\"></script>");
            client.println("<style> html {font-family: Helvetica; display: inline-block; margin: 0px; text-align: center; height: auto; box-sizing: border-box;} h1, h2{width: 100%; color: #444444; font-size: 55px;} h2 {font-size: 30px;} h3, h4 {width: 50%; font-size: 24px; color: #444444; padding: 18px; margin: 10px; border-radius: 35px; margin: 4px auto;} h4 {padding: 5px;} .button {background-color: #4CAF50; border: none; color: white; padding: 16px 40px; text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;} .button2 {background-color: #555555;} .content {width: 100%; } .light {border-radius: 35px; width: 50%; margin: 4px auto;} .slider {-webkit-appearance: none; width: 30%; height: 10px; border-radius: 5px; margin-bottom: 20px; background: #d3d3d3; outline: none; } .slider::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 20px; height: 20px; border-radius: 50%; background: #444444; cursor: pointer;} @media (max-width: 1000px) {h1{font-size: 40px;} h2{font-size: 25px;} h3,h4{width: 75%; font-size: 20px;} .light{ width: 75%;}}</style><title>Smart TERA</title> </head> ");
            client.println("<body><div class=\"header\"> <h1>Smart TERA</h1><h2>");
            client.println(timeStamp);
            client.println(" / " + dayStamp);
            client.println("</h2> </div> <div class=\"content\"><h3 style =\"background-color: #ff8000;\">Temperature: ");
            client.println(temperature);
            client.println("&#8451; /  ");
            client.println(temperaturef);
            client.println("&#8457; </h3><h3 style =\"background-color: #4da6ff;\">Humidity: ");
            client.println(humidity);
            client.println("%</h3><div class=\"light\" style=\"background-color: #ffff33;\"><h3>Light Brightness: <span id=\"lightPos\"></span> %</h3> <input class=\"slider\" type=\"range\" min=\"0\" max=\"100\" step=\"25\" value="+brightness+" id=\"myRange\">");
            client.println("<script> var slider = document.getElementById(\"myRange\"); var lightP = document.getElementById(\"lightPos\"); lightP.innerHTML = slider.value; $.ajaxSetup({timeout:1000}); slider.oninput = function() { slider.value = this.value; lightP.innerHTML = this.value; $.get(\"/?value=\" + this.value + \"&\"); {Connection: close};}</script> </div>");

            if(header.indexOf("GET /?value=")>=0) {
                pos1 = header.indexOf('=');
                pos2 = header.indexOf('&');
                valueString = header.substring(pos1+1, pos2);
                if(valueString == "0" ){
                  brightness = "0";
                  analogWrite(relay2, 0);
                } else if (valueString == "25"){
                  brightness = "25";
                  analogWrite(relay2, 256);
                } else if (valueString == "50"){
                  brightness = "50";
                  analogWrite(relay2, 512);
                } else if (valueString == "75"){
                  brightness = "75";
                  analogWrite(relay2, 768);
                } else if (valueString == "100"){
                  brightness = "100";
                  analogWrite(relay2, 1024);
                } 
           }
            // Display current state, and ON/OFF buttons for controlling relays, If the relay0State is off, it displays the ON button  
            client.println("<h4>Rock Heater - State ");      
            if (relay0State == 0) {
              client.println("off</h4><p><a href=\"/0/on\"><button class=\"button\">ON</button></a></p>");
            } else {
              client.println("on</h4><p><a href=\"/0/off\"><button class=\"button button2\">OFF</button></a></p>");
            } 

            client.println("<h4>Humidifier - State ");     
            if (relay1State == 0) {
              client.println("off </h4><p><a href=\"/1/on\"><button class=\"button\">ON</button></a></p>");
            } else {
              client.println("on </h4><p><a href=\"/1/off\"><button class=\"button button2\">OFF</button></a></p>");
            }
            client.println("</div></body></html>");

            // The HTTP response ends with another blank line
            client.println();
            // Break out of the while loop
            yield();
            break;
          } else { // if you got a newline, then clear currentLine
            currentLine = "";
          }
        } else if (c != '\r') {  // if you got anything else but a carriage return character,
          currentLine += c;      // add it to the end of the currentLine
        }
      } 
    }
    // Clear the header variable and close the connection
    header = "";
    client.stop();
   }
}

Decoded error:

2.4.0 had a memory leak. your problem is memory fragmentation with String class. — Juraj, Apr 8 at 16:59
how can i fix that? i tried replacing strings with chars but i cant get my code working.. i dont know how to make same operations without strings — Dan, Apr 8 at 17:08
learn it. I don't know if it can help you, but here is my Web Server github.com/jandrassy/Regulator/blob/master/Regulator/… — Juraj, Apr 8 at 17:19

Michel Keijzers · Accepted Answer · 2019-05-26 09:08:02Z

First, take out the wdt.feed all that does is delay the real problem and/or shift it somewhere else. As a rule of thumb, if you even THINK you have to use / touch / play with / cancel the WDT, your code is already wrong. The root problem is your code is "blocking" longer than the underlying WiFI stack is happy with. A culprit is: while(!timeClient.update()) How long does that take? If it "blocks" then your code will fail. "Multiple" / "Parallel" tasks must run asynchronously and yield() to the backgound WiFi if they are long-running. If you mix old fashioned, blocking code with modern asynchronous code, THIS is exactly what you will get.

Other points: all that println stuff in the main loop is horribly inefficient and won't be helping. Setup the main body of text once and edit / resend the bits that change.

Also I believe DHT11 can sometimes take a while to settle / read. If the library you are using is not optimised for ESP8266 and / or non-blocking, there's another potential source of error. I believe DHT11 can also sometimes return NaN rather than a valid value - how do you cope with that?

There's an async webserver library that does all that side of things properly - you are reinventing a wheel and yours is square. You need to find an async NTP library too. "But I found it in the library examples!" Is NOT a guarantee / justification that the code is a) useful b) any good c) well-written d) functional for any other purpose. In my experience its usually the opposite of all four, especially if you mix two libraries together. It's an "example" - it's not production code.

Final takeaway:

Use the right library for the right job
NEVER mess with the WDT
NEVER mix sync + async code
Most example ESP8266 code assumes a single function, not needing to cooperate with any other. If you mix / blend separate examples / functions (e.g. DHT11 AND NTP AND WEBSERVER), YOU must provide the co-operation between functions + ESP8266 background WiFi. If you don't (and you haven't) you will cause a WDT reset, 100% guaranteed.

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