WDT reset when using modem sleep

[trentbrown13]

Basic Infos

Hardware

Hardware: Wemos d1 mini
Core Version: 2.4.0-rc1

Description

I am using modem sleep with the wemos D1 mini which works fine with 2.3.0. After upgrading to 2.4.0-rc1 I get a wdt reset immediately after issuing "WiFi.forceSleepBegin();" I later downgraded back to 2.3.0 and it works fine again. One note, my free heap reported by "ESP.getFreeHeap(); seemed to be much lower when using 2.4.0-rc1 but I was primarily trying to isolate the wdt reset cause. I only noticed this as I am chasing a memory leak problem and printing heap size all over the place.

Settings in IDE

Module: Wemos D1 R2 mini
Flash Size: ?4MB/1MB?
CPU Frequency: ?80Mhz?
Flash Mode: ?qio?
Flash Frequency: ?40Mhz?
Upload Using: SERIAL
Reset Method: ?ck / nodemcu?

Sketch

#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <PubSubClient.h>  // for mqtt
#include <OneWire.h>
#include <DallasTemperature.h>
#include <Wire.h>  
#include "SSD1306.h"
#include <ESP8266mDNS.h> 
#include <ArduinoOTA.h>
#include <WiFiUdp.h> 
#include <cactus_io_BME280_I2C.h>
// ntp includes
#include <TimeLib.h>
//#include "WifiConfig.h" 
#include <NtpClientLib.h>

void setup() {

}

void loop() {
************ snip *************
 getTemperatures();
     
     client.publish("/TbOffice/Tub/temperature", tubTempFString);
     client.publish("/TbOffice/Out/temperature", outTmpFString);

    Serial.print(" End loop number: ");
    Serial.println(x);
   
  lcdDisplayTemps();
  yield();
  } // end for loop

 Serial.println("Going down for a 60 second nap");
 yield();
 //delay(5000);
 //Serial.println(F("just before Wifi.forceSleepBegin"));
  WiFi.forceSleepBegin();

  ///////////// NEVER GETS HERE when using 2.4.0-rc1
  
 //Serial.println(F("just after Wifi.forceSleepBegin"));
 delay(1 * sleepM); // 10 seconds for test
}
************** end snip ***************

Stack Trace

Soft WDT reset

ctx: cont
sp: 3fff0990 end: 3fff0c00 offset: 01b0

stack>>>
3fff0b40: 0001260d 00000600 3ffef794 4021ad48
3fff0b50: 0fffffff 40203d5e 00000000 40203d49
3fff0b60: 3ffefb18 3ffef914 3ffef794 40203452
3fff0b70: 00000000 00000000 00000000 4020a77c
3fff0b80: 00000000 00000000 00000000 00000000
3fff0b90: 00000000 00000000 00000000 00000000
3fff0ba0: 00000000 00000000 00000000 00000000
3fff0bb0: 3ffe9730 b564a8c0 3ffe9730 b564a8c0
3fff0bc0: 00000006 42955b23 4479c281 feefeffe
3fff0bd0: feefeffe feefeffe feefeffe 3ffefbd8
3fff0be0: 3fffdad0 00000000 3ffefbd0 4020b4b0
3fff0bf0: feefeffe feefeffe 3ffefbe0 4010070c
<<<stack<<<

ets Jan 8 2013,rst cause:2, boot mode:(3,6)

load 0x4010f000, len 1384, room 16
tail 8
chksum 0x2d
csum 0x2d
vf6d232f1
~ld

Decoding 8 results
0x4021ad48: ieee80211_setup_ratetable at ?? line ?
0x40203d5e: ESP8266WiFiGenericClass::enableSTA(bool) at C:\Users\Windows7\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\libraries\ESP8266WiFi\src/ESP8266WiFiGeneric.cpp line 96
0x40203d49: ESP8266WiFiGenericClass::getMode() at C:\Users\Windows7\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\libraries\ESP8266WiFi\src/ESP8266WiFiGeneric.cpp line 96
: (inlined by) ESP8266WiFiGenericClass::enableSTA(bool) at C:\Users\Windows7\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\libraries\ESP8266WiFi\src/ESP8266WiFiGeneric.cpp line 329
0x40203452: loop at D:\Programming\ESP\Weather nodes\Trents_Office_Msleep1G/Trents_Office_Msleep1G.ino line 738 (discriminator 3)
0x4020a77c: String::changeBuffer(unsigned int) at C:\Users\Windows7\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/WString.cpp line 720
0x4020b4b0: String::move(String&) at C:\Users\Windows7\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/WString.cpp line 205
: (inlined by) String::String(String&&) at C:\Users\Windows7\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/WString.cpp line 51
0x4010070c: cont_resume at C:\Users\Windows7\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/cont.S line 99

[igrr]

Sorry, i tried running the sketch you provided, but it does not compile. Could you please check and make sure that the sketch can be compiled and reproduces the issue? Thanks.

[trentbrown13]

Sorry Ivan, that was just a code snippet. Here is another example

#include <TimeLib.h>
#include "WifiConfig.h"
#include <NtpClientLib.h>
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
//#include <DHT.h>
#define DEBUG 1

//#define DHTTYPE DHT11 // DHT 11
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
//#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321

extern "C" {
#include "gpio.h"
}

extern "C" {
#include "user_interface.h"
}
/*#ifndef WIFI_CONFIG_H
#define YOUR_WIFI_SSID BlueZebra
#define YOUR_WIFI_PASSWD jY7bzy2XJv
#endif // !WIFI_CONFIG_H
*/

#ifndef WIFI_CONFIG_H
#define YOUR_WIFI_SSID "YOUR_WIFI_SSID"
#define YOUR_WIFI_PASSWD "YOUR_WIFI_PASSWD"
#endif // !WIFI_CONFIG_H

//const char* YOUR_WIFI_SSID = "BlueZebra";
//const char* YOUR_WIFI_PASSWD = "jY7bzy2XJv";
const char* ssid = "BlueZebra";
const char* password = "jY7bzy2XJv";
//const char* ssid = "SRGTEST_2G";
//const char* password = "5martRG!";

static int connectAttempts = 0;
static int connectPass = 0;
static int connectFail = 0;
long previousMillis = 0;
long interval = 5100;

const char* ahostname = "MQTT_Test";
//#define ONBOARDLED 2 // Built in LED on ESP-12/ESP-07
//#define WIFI_PASS_LED 5
//#define WIFI_FAIL_LED 4

#define SLEEPM 60000 // one minute

//int8_t timeZone = 1;

int8_t timeZone = -8; // PST

// Start NTP only after IP network is connected
void onSTAGotIP(WiFiEventStationModeGotIP ipInfo) {
//NTP.stop();
//pinMode(WIFI_PASS_LED, OUTPUT);
//pinMode(WIFI_FAIL_LED, OUTPUT);
Serial.printf("Got IP: %s\r\n", ipInfo.ip.toString().c_str());
connectPass ++;
//digitalWrite(WIFI_PASS_LED, HIGH);
//delay(1000);
//digitalWrite(WIFI_PASS_LED, LOW);
//Serial.println("Just before NTP.begin - CRASHES HERE");
NTP.begin("pool.ntp.org", timeZone, true);
//Serial.println("Just after NTP.begin and before ntp.setInterval");
NTP.setInterval(63);
//Serial.println("Just after ntp.setInterval");
//digitalWrite(ONBOARDLED, LOW); // Turn on LED
}

// Manage network disconnection
void onSTADisconnected(WiFiEventStationModeDisconnected event_info) {
Serial.printf("Disconnected from SSID: %s\n", event_info.ssid.c_str());
Serial.printf("Reason: %d\n", event_info.reason);
//digitalWrite(ONBOARDLED, HIGH); // Turn off LED
//NTP.stop(); // NTP sync can be disabled to avoid sync errors
}

void processSyncEvent(NTPSyncEvent_t ntpEvent) {
if (ntpEvent) {
Serial.print("Time Sync error: ");
if (ntpEvent == noResponse)
Serial.println("NTP server not reachable");
else if (ntpEvent == invalidAddress)
Serial.println("Invalid NTP server address");
}
else {
Serial.print("Got NTP time: ");
Serial.println(NTP.getTimeDateString(NTP.getLastNTPSync()));
}
}

boolean syncEventTriggered = false; // True if a time even has been triggered
NTPSyncEvent_t ntpEvent; // Last triggered event

void setup()
{
static WiFiEventHandler e1, e2;

Serial.begin(115200);
Serial.println();
//WiFi.mode(WIFI_STA);
//WiFi.begin(YOUR_WIFI_SSID, YOUR_WIFI_PASSWD);

//connectAttempts++;
//pinMode(ONBOARDLED, OUTPUT); // Onboard LED
//digitalWrite(ONBOARDLED, HIGH); // Switch off LED
//pinMode(WIFI_PASS_LED, OUTPUT);
//digitalWrite(WIFI_PASS_LED, LOW);
//pinMode(WIFI_FAIL_LED, OUTPUT);
//digitalWrite(WIFI_FAIL_LED, LOW);
//digitalWrite(WIFI_PASS_LED, HIGH);
//delay(1000);
//digitalWrite(WIFI_PASS_LED, LOW);

NTP.onNTPSyncEvent([](NTPSyncEvent_t event) {
ntpEvent = event;
syncEventTriggered = true;
});

// Deprecated
/*WiFi.onEvent([](WiFiEvent_t e) {
	Serial.printf("Event wifi -----> %d\n", e);
});*/

e1 = WiFi.onStationModeGotIP(onSTAGotIP);// As soon WiFi is connected, start NTP Client
e2 = WiFi.onStationModeDisconnected(onSTADisconnected);

// **************** WIFI connect section ***************
Serial.println();
connectAttempts += 1;
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.mode(WIFI_STA); // try commenting if OTA does not work
WiFi.persistent(false);
//WiFi.config(ip, gateway, subnet, dns);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}

while (WiFi.waitForConnectResult() != WL_CONNECTED) {
Serial.println("Connection Failed! Rebooting...");
connectFail += 1;
//digitalWrite(WIFI_FAIL_LED, HIGH);
//delay(1000);
//digitalWrite(WIFI_FAIL_LED, LOW);
delay(1000);
ESP.restart();
}
connectPass += 1;

}

void loop()
{
//static int i = 0;
//static int last = 0;
unsigned long currentMillis = millis();
static int i = 0;

if (syncEventTriggered) {
	processSyncEvent(ntpEvent);
	syncEventTriggered = false;
}

/*
if ((millis() - last) > 5100) {
//Serial.println(millis() - last);
last = millis();

*/
if(currentMillis - previousMillis > interval)
{
previousMillis = currentMillis;
// Serial.print(i); Serial.print(" ");
Serial.println(F("getting 5 NTP readings before going to sleep"));
for(i = 1; i<=5; i++)
{
yield();

	//Serial.print(i); Serial.print(" ");
Serial.print(NTP.getTimeDateString()); Serial.print(" ");
	Serial.print(NTP.isSummerTime() ? "Summer Time. " : "Winter Time. ");
	Serial.print("WiFi is ");
	Serial.print(WiFi.isConnected() ? "connected" : "not connected"); Serial.print(". ");
	Serial.print("Uptime: ");
	Serial.print(NTP.getUptimeString()); Serial.print(" since ");
	Serial.println(NTP.getTimeDateString(NTP.getFirstSync()).c_str());
#ifdef DEBUG
Serial.println("Free Heap      = " + String(ESP.getFreeHeap()));
Serial.println("Last Reset Reason      = " + String(ESP.getResetReason()));
#endif
Serial.print("End Get NTP loop number ");
Serial.println(i);
delay(5000);

}
Serial.println("Done working hard, going to take a nap");
Serial.println("");

//ESP.deepSleep(SLEEPM * 1, WAKE_RF_DEFAULT);

// print connection results
connectAttempts++;
//connectPass += 1;
Serial.println("*****************************************************************");
Serial.print("Connect Attempts ");
Serial.print(connectAttempts);
Serial.print("\tConnect Complete ");
Serial.print(connectPass);
Serial.print("\tConnect Fail ");
Serial.println(connectFail);
Serial.println("*****************************************************************");
Serial.println(""); 

Serial.print("wifi should be off for 10 seconds, try pinging ");
Serial.println(WiFi.localIP());
#ifdef DEBUG
Serial.println(F("Just before NTP.stop and wifi disconnect"));
Serial.println("Free Heap      = " + String(ESP.getFreeHeap()));
#endif
NTP.stop();
delay(1000);
WiFi.disconnect();
#ifdef DEBUG
Serial.println(F("Just after wifi disconnect and before force sleep begin"));
Serial.println("Free Heap      = " + String(ESP.getFreeHeap())); 
#endif
//delay(5000);
WiFi.forceSleepBegin();
#ifdef DEBUG
Serial.println(F("Just after force sleep and before 1st delay"));
Serial.println("Free Heap      = " + String(ESP.getFreeHeap())); 

delay(5000);
//Serial.println(F("Just after 1st delay"));
//Serial.println("Free Heap      = " + String(ESP.getFreeHeap())) ;  

// delay(10000);
delay(5000);

Serial.println(F("Just after 2nd delay"));
Serial.println("Free Heap      = " + String(ESP.getFreeHeap()));
#endif
delay(5000);
#ifdef DEBUG
Serial.println(F("Just after 3rd delay"));
Serial.println("Free Heap      = " + String(ESP.getFreeHeap()));
#endif
WiFi.forceSleepWake();
Serial.println("wifi should be back on");
#ifdef DEBUG
Serial.println(F("Just after forcesleepwake"));
//Serial.println("Free Heap      = " + String(ESP.getFreeHeap()));
#endif
//yield();
//WiFi.begin(YOUR_WIFI_SSID, YOUR_WIFI_PASSWD);

Serial.println("Doing WiFi Begin");
//WiFi.persistent(false);
WiFi.begin(ssid, password);
#ifdef DEBUG
Serial.println(F("Just wifi begin"));

//Serial.println("Free Heap = " + String(ESP.getFreeHeap()));
#endif
Serial.println("Done WiFi Begin");
Serial.println("Starting 10 sec Delay");
delay(10000);
Serial.println("Finished 10 sec Delay");
//digitalWrite(WIFI_PASS_LED, HIGH);
// delay(1000);
//digitalWrite(WIFI_PASS_LED, LOW);
//pinMode(ONBOARDLED, OUTPUT); // Onboard LED
//digitalWrite(ONBOARDLED, HIGH); // Switch off LED
delay(500);
#ifdef DEBUG
Serial.println(F("Just before on NTP sync event"));
Serial.println("Free Heap = " + String(ESP.getFreeHeap()));
#endif
NTP.onNTPSyncEvent([](NTPSyncEvent_t event) {
ntpEvent = event;
syncEventTriggered = true;
#ifdef DEBUG
Serial.println(F("Just after sync event triggered"));
Serial.println("Free Heap = " + String(ESP.getFreeHeap()));
#endif
});

//e1 = WiFi.onStationModeGotIP(onSTAGotIP);// As soon WiFi is connected, start NTP Client

// e2 = WiFi.onStationModeDisconnected(onSTADisconnected);

}
//delay(0);

}

[trentbrown13]

Not sure if you wouold like like a new ticket opened or just add to this one. This time running 2.3.0 with a much simplified sketch.
stack Decode:

decoding 21 results
0x40104927: lmacRxDone at ?? line ?
0x401004d8: malloc at C:\Users\Windows7\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266\umm_malloc/umm_malloc.c line 1664
0x40107084: pvPortMalloc at C:\Users\Windows7\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/heap.c line 13
0x40222670: pbuf_alloc at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/core/pbuf.c line 366
0x4022550e: udp_sendto at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/core/udp.c line 450
0x40222b9f: sntp_initialize_request at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/core/sntp.c line 698
:  (inlined by) sntp_send_request at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/core/sntp.c line 885
0x40222bb3: sntp_send_request at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/core/sntp.c line 889
0x40105cdc: sntp_dns_found at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/core/sntp.c line 917
0x40221cf5: dns_recv at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/core/dns.c line 825
0x40221d04: dns_recv at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/core/dns.c line 826
0x40210400: scan_parse_beacon at ?? line ?
0x402252a8: udp_input at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/core/udp.c line 343
0x40107084: pvPortMalloc at C:\Users\Windows7\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/heap.c line 13
0x402269e4: ip_input at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/core/ipv4/ip.c line 553
0x40225ded: ethernet_input at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/netif/etharp.c line 1379
0x40205faf: pp_tx_idle_timeout at ?? line ?
0x40205f22: pp_tx_idle_timeout at ?? line ?
0x4021a01b: ets_snprintf at ?? line ?

Sketch:

#define HEAPCHECKER 1        // set to 1 to test HEAP loss fix
#ifdef HEAPCHECKER
  #include "lwip/tcp_impl.h" // losing bytes work around
#endif
#include <TimeLib.h>
//#include "WifiConfig.h"
#include <NtpClientLib.h>
#include <ESP8266WiFi.h>
#include <PubSubClient.h>

#define DEBUG 1
#define NTP_ON 1

extern "C" {
#include "gpio.h"
}

extern "C" {
#include "user_interface.h"
}


int count_sleep = 0;
int count_wake = 0;
uint32_t originalram;


//*************** SSID Stuff *********************************
const char* ssid = "BlueZebra";
const char* password = "jY7bzy2XJv";
//const char* ssid = "SRGTEST_2G";
//const char* password = "5martRG!";
//**********************************************************************

//******************* Connect Attempt ***********************************
static int connectAttempts = 0;
static int connectPass = 0;
static int connectFail = 0;
//*********************************************************************

//************** Millis stuff *****************************************
unsigned long previousMillis = 0;
const unsigned long sleeptime = 30000; // milliseconds
bool awake = true;  //flag for waking up and getting busy
//*********************************************************************



//********************* NTP Stuff ***********************************
int8_t timeZone = -8; // PST

// Start NTP only after IP network is connected
void onSTAGotIP(WiFiEventStationModeGotIP ipInfo) {
  Serial.printf("Got IP: %s\r\n", ipInfo.ip.toString().c_str());
  connectPass ++;
  //#ifdef NTP_ON
  //NTP.begin("pool.ntp.org", timeZone, true);
  //NTP.setInterval(63);
  
 // #endif
  //digitalWrite(ONBOARDLED, LOW); // Turn on LED
}

// Manage network disconnection
void onSTADisconnected(WiFiEventStationModeDisconnected event_info) {
  Serial.printf("Disconnected from SSID: %s\n", event_info.ssid.c_str());
  Serial.printf("Reason: %d\n", event_info.reason);
  NTP.stop();
 
}
#ifdef NTP_ON
void processSyncEvent(NTPSyncEvent_t ntpEvent) {
  if (ntpEvent) {
    Serial.print("Time Sync error: ");
    if (ntpEvent == noResponse)
      Serial.println("NTP server not reachable");
    else if (ntpEvent == invalidAddress)
      Serial.println("Invalid NTP server address");
  }
  else {
    Serial.print("Got NTP time: ");
    Serial.println(NTP.getTimeDateString(NTP.getLastNTPSync()));
  }
}

boolean syncEventTriggered = false; // True if a time event has been triggered
NTPSyncEvent_t ntpEvent; // Last triggered event
#endif
//****************************************************************************************



//************************** Losing bytes work around ************************************
void tcpCleanup()   // losing bytes work around
{
  while(tcp_tw_pcbs!=NULL)
  {
    tcp_abort(tcp_tw_pcbs);
  }
}
//******************************************************************************************







void setup() {
  //Commenting out event handler stuff in VG, just start NTP once
 // static WiFiEventHandler e1, e2;
  //timeZone = -8; // PST
  //timeZone = -17; // PST ??
  Serial.begin(115200);
  Serial.println(F("In setup, runs once"));
  Serial.println(F("Before declaring static WiFIEventHandler e1, e2"));
  Serial.println("Free Heap      = " + String(ESP.getFreeHeap(),DEC));
  //*************** NTP setup **************************************
  /*
  NTP.onNTPSyncEvent([](NTPSyncEvent_t event) {
    ntpEvent = event;
    syncEventTriggered = true;
  });
  */
// **************** WIFI connect section ***************
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.mode(WIFI_STA);   // try uncommenting if OTA does not work
  WiFi.persistent(false);
  //WiFi.config(ip, gateway, subnet, dns);

  // Need to put connectAttempts and connetPass into eventhandlers
  WiFi.begin(ssid, password);
  connectAttempts ++;
  
  Serial.print("Connecting");
  while (WiFi.status() != WL_CONNECTED) {
      Serial.print(".");
      delay(200);
  }
// Added this in VG, jsut start NTP once
  connectPass ++;
  NTP.begin("pool.ntp.org", timeZone, true);
  NTP.setInterval(63);
  
  //Commenting out event handler stuff in VG, just start NTP once
/*
   NTP.onNTPSyncEvent([](NTPSyncEvent_t event) {
    ntpEvent = event;
    syncEventTriggered = true;
  });
  */
  
/*  
while (WiFi.waitForConnectResult() != WL_CONNECTED) {
    Serial.println("Connection Failed! Rebooting...");
    delay(5000);
    ESP.restart();
  }
  */
  //Commenting out event handler stuff in VG, just start NTP once
  //e1 = WiFi.onStationModeGotIP(onSTAGotIP);// As soon WiFi is connected, start NTP Client
  //e2 = WiFi.onStationModeDisconnected(onSTADisconnected);
}

void loop()
{
  //static WiFiEventHandler e1, e2;
  int i;
  uint32_t ram = ESP.getFreeHeap();
 
 
 #ifdef NTP_ON 
  if (syncEventTriggered) {
    processSyncEvent(ntpEvent);
    syncEventTriggered = false;
  }
  #endif
  //static WiFiEventHandler e1, e2;  // might move to global moved to static TestD ?
  Serial.println(F("At top of loop now,"));
  Serial.println("Free Heap      = " + String(ESP.getFreeHeap(),DEC));
  WiFi.persistent(false);
  WiFi.mode(WIFI_OFF);
  WiFi.mode(WIFI_STA);
  // get the current time at the start of each loop
  unsigned long currentMillis = millis();

  if (awake == true) {
    //WiFi.mode(WIFI_ON);

  Serial.printf("RAM: %d  change %d\n", ram, (ram - originalram ));

  
  /*
  if(HEAPCHECKER){          // losing bytes work around
    tcpCleanup();           
    Serial.printf("tcpCleanup completed\n");
  }
  */
    Serial.println(F("awake = true, getting to work"));
    Serial.println("Free Heap      = " + String(ESP.getFreeHeap(),DEC));

    Serial.println(F("starting Wifi"));
    Serial.print(F("Connecting to "));
    Serial.println(ssid);
    // try commenting if OTA does not work

    //WiFi.config(ip, gateway, subnet, dns);
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  connectPass ++;
  #ifdef NTP_ON
  delay(1000);
 /*
  NTP.onNTPSyncEvent([](NTPSyncEvent_t event) {
    ntpEvent = event;
    syncEventTriggered = true;
  });
  
  //e1 = WiFi.onStationModeGotIP(onSTAGotIP);// As soon WiFi is connected, start NTP Client
  //e2 = WiFi.onStationModeDisconnected(onSTADisconnected);
  */
  #endif
  
    Serial.println(F("Right after WiFi.begin and before NTP crap"));
    Serial.println("Free Heap      = " + String(ESP.getFreeHeap(),DEC));
  #ifdef NTP_ON
    Serial.println(F("getting 5 NTP readings before going to sleep"));
    for (i = 1; i <= 5; i++)
    {
      yield();

      //Serial.print(i); Serial.print(" ");
      Serial.print(NTP.getTimeDateString()); Serial.print(" ");
      Serial.print(NTP.isSummerTime() ? "Summer Time. " : "Winter Time. ");
      Serial.print("WiFi is ");
      Serial.print(WiFi.isConnected() ? "connected" : "not connected"); Serial.print(". ");
      Serial.print("Uptime: ");
      Serial.print(NTP.getUptimeString()); Serial.print(" since ");
      Serial.println(NTP.getTimeDateString(NTP.getFirstSync()).c_str());
//#ifdef DEBUG
      Serial.println("Free Heap      = " + String(ESP.getFreeHeap(),DEC));
      Serial.println("Last Reset Reason      = " + String(ESP.getResetReason()));
//#endif
      Serial.print("End Get NTP loop number ");
      Serial.println(i);
      delay(1000);
    }
#endif

    Serial.println("Done working hard, going to take a nap");
    Serial.println("");


    // print connection results
    connectAttempts++;
    //connectPass += 1;
    Serial.println("*****************************************************************");
    Serial.print("Connect Attempts ");
    Serial.print(connectAttempts);
    Serial.print("\tConnect Complete ");
    Serial.print(connectPass);
    Serial.print("\tConnect Fail ");
    Serial.println(connectFail);
    Serial.println("*****************************************************************");
    Serial.println("");
    Serial.println(F("Right after print connect attempts info"));
    Serial.println("Free Heap      = " + String(ESP.getFreeHeap(),DEC));
  
     // Serial.println(F("Getting NTP stuff"));
     // NTP.begin("pool.ntp.org", timeZone, true);
     //Serial.println("Just after NTP.begin and before ntp.setInterval");
     //NTP.setInterval(63);
     //Serial.println("Free Heap      = " + String(ESP.getFreeHeap(),DEC));
    Serial.println(F("Done Working, taking a nap"));  //
    Serial.println("Free Heap      = " + String(ESP.getFreeHeap(),DEC));
     // put into sleep mode here
     //NTP.stop();
     
     //Serial.println(F("Getting rid of TCP stuff"));
     //Serial.println(F("Getting rid of NTP stuff"));
     count_sleep += 1;
     Serial.print(F("sleep count = "));
     Serial.println(count_sleep);
     #ifdef NTP_ON
     NTP.stop();
     #endif
     WiFi.disconnect();
     WiFi.mode(WIFI_OFF);
 
     Serial.println(F("************ forceing modem sleep *******************"));
     WiFi.forceSleepBegin();
     delay(1);
     Serial.println(F("**************** Setting awake to False ***************"));
     awake = false;
     //e2 = WiFi.onStationModeDisconnected(onSTADisconnected);

     Serial.println(F("*************** End if awake = TRUE **********************"));
         }  // End if awake = true
     else {
       delay(1000);
       Serial.println(F("*************** Still sleeping but checking TIME **********************"));
       Serial.print(F("sleeping for  = "));
       Serial.print(sleeptime /1000);
       Serial.print(F(" seconds, Time Elapsed = "));
       Serial.print((currentMillis - previousMillis)/1000);
       Serial.println(F(" seconds"));
       Serial.println(F("***********************************************************************"));
     }
         if ((unsigned long)(currentMillis - previousMillis) >= sleeptime) {
         Serial.println(F("**************Time to Wake up and get to work!******************"));
         Serial.println(F("************** awake = TRUE ******************"));
             awake = true;
             count_wake += 1;
             Serial.print(F("Wake count = "));
                 Serial.println(count_wake);
                 Serial.println(F("**************** Waking up WiFi ***************"));
                 WiFi.forceSleepWake();
                 previousMillis = millis();
               }
   }

This crash appears at random times, perhaps I need to reformat the flash?
Please let me know if I should add updates etc in a better manor

[trentbrown13]

Sorry, did not mean to close this ticket. I reformatted the flash with esptool and uploaded again. monitoring for now.
thanks
-trent

[devyte]

@trentbrown13 what was the result of your monitoring?

[trentbrown13]

It was still crashing after re-flashing and I am now downgraded again to 2.3 which is running flawlessly on several esp's. I'll try upgrading to 2.4.0-rc2 soon and try again on a few devices. Thanks for the help!

[gsimard]

I too get this issue with 8edeac0.

The issue seems to be timing related and is hard to pin point.

Essentially I do:

setup() {
  // Credentials are known from a previous WPS transaction and retrieved from EEPROM.
  WiFi.begin(WiFi.SSID().c_str(),WiFi.psk().c_str());
  // Some more code to wait the above to complete. Connects fine.
  ...
}

loop() {
  // This runs fine although it takes a bit of time to complete the transaction
  // after remote end has hanged up
  doHttpsGetTransaction(); 

  // Reset WDT in case we blocked without yield'ing for a while, but shouldn't be necessary
  ESP.wdtFeed();

  // Turn the WiFi off before we sleep
  WiFi.mode(WIFI_OFF);
  WiFi.forceSleepBegin();

  // The WDT (soft or hard if I disable the software wdt) trips HERE, before deepSleep.

  ESP.deepSleep(20e6, WAKE_RF_DEFAULT);
}

If I do NOT call doHttpsGetTransaction, the ESP8266 goes to sleep and the WDT does NOT trip.

[gsimard]

Turns out reducing the timeout value of the WiFiSecureClient from 15s to 100ms helps a lot with this issue.

Indeed after the peer hangs up on the connection it took a while for my sketch to take notice and this is due to Stream::timedRead() waiting for _timeout = 15000 set in WiFiClientSecure::WiFiClientSecure().

It looks like shaving these previous seconds allows the return from loop() and the hardware WDT being reset on time.

I don't like the feel of this though as I expect to be bitten again later down the road.

Is there a maximum absolute amount of time one should stay in loop before returning ? Does calling ESP.wdtFeed() reset the hardware WDT or just the software WFT ?

Best regards,

[SunboX]

Can confirm, WiFi.forceSleepBegin(); triggers a Soft WDT reset also for me. Commenting out that line works.

[trentbrown13]

As with issue #4082, WiFiForceSleepBegin() still caused a WDT reset with core 2.5 until I added a delay(1000) just before it. With this delay, my sketch has been running for 2+ days with a WiFiForceSleepBegin() every 60 seconds or so.

Not sure if the "waiting for feed back" label is still pertinent, let me know if I can provide more info.

[earlephilhower]

Wow, looks like WiFi power down has been an issue a looong time. Closing as we've got an active discussion of this in #6172 where folks are making some progress, I believe. This will also make a link there to this discussion so they can avoid trying the same dead-ends you ran into.