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README.md

ESP_DoubleResetDetector

Why do we need this ESP_DoubleResetDetector library

Features

ESP_DoubleResetDetector is a library for the ESP8266 and ESP32 boards to detects a double reset, within configurable timeout (default 10s) seconds, so that an alternative start-up mode can be used. Example use cases are to allow re-configuration of a device’s WiFi / MQTT / Blynk credentials.

This library is based on, modified, bug-fixed and improved from Stephen Denne's DoubleResetDetector to add support to ESP8266 and ESP32 using EEPROM, SPIFFS and LittleFS besides original RTC.

Currently, DoubleResetDetector only supports ESP8266 using RTC memory.

This library can be used to detect a double reset within a predetermined time to force the program to enter a special operation such as Config Portal, Clear Default Data, etc., using :

EEPROM, SPIFFS or LittleFS for ESP8266 and ESP32 boards.
RTC memory for ESP8266 boards (unadvised).

Currently supported Boards

This ESP_DoubleResetDetector library currently supports these following boards:

ESP32, ESP32_C3, ESP32_S2 and ESP32_S3 boards, using EEPROM, SPIFFS or LittleFS.
ESP8266 boards RTC memory, EEPROM, SPIFFS or LittleFS

Prerequisites

Arduino IDE 1.8.19+ for Arduino.
ESP32 Core 2.0.2+ for ESP32-based boards.
ESP8266 Core 3.0.2+ for ESP8266-based boards. . SPIFFS is deprecated from ESP8266 core 2.7.1+, to use LittleFS.
LittleFS_esp32 v1.0.6+ for ESP32-based boards using LittleFS with ESP32 core v1.0.5-. To install, check . Notice: This LittleFS_esp32 library has been integrated to Arduino ESP32 core v1.0.6+ and you don’t need to install it if using ESP32 core v1.0.6+

Installation

Use Arduino Library Manager

The best and easiest way is to use Arduino Library Manager. Search for ESP_DoubleResetDetector, then select / install the latest version. You can also use this link for more detailed instructions.

Manual Install

Navigate to ESP_DoubleResetDetector page.
Download the latest release ESP_DoubleResetDetector-master.zip.
Extract the zip file to ESP_DoubleResetDetector-master directory
Copy the whole ESP_DoubleResetDetector-master folder to Arduino libraries’ directory such as ~/Arduino/libraries/.

VS Code & PlatformIO:

Install VS Code
Install PlatformIO
Install ESP_DoubleResetDetector library by using Library Manager. Search for ESP_DoubleResetDetector in Platform.io Author’s Libraries
Use included platformio.ini file from examples to ensure that all dependent libraries will installed automatically. Please visit documentation for the other options and examples at Project Configuration File

HOWTO Usage

How to use

// These defines must be put before #include <ESP_DoubleResetDetector.h>
// to select where to store DoubleResetDetector's variable.
// For ESP32, You must select one to be true (EEPROM or SPIFFS)
// For ESP8266, You must select one to be true (RTC, EEPROM, LITTLEFS or SPIFFS)
// Otherwise, library will use default EEPROM storage


#ifdef ESP8266
#define ESP8266_DRD_USE_RTC     false   //true
#define ESP_DRD_USE_LITTLEFS    true    //false
#endif

#define ESP_DRD_USE_EEPROM      false
#define ESP_DRD_USE_SPIFFS      true

#define DOUBLERESETDETECTOR_DEBUG       true  //false

#include <ESP_DoubleResetDetector.h>      //https://github.com/khoih-prog/ESP_DoubleResetDetector

// Number of seconds after reset during which a 
// subseqent reset will be considered a double reset.
#define DRD_TIMEOUT 10

// RTC Memory Address for the DoubleResetDetector to use
#define DRD_ADDRESS 0

DoubleResetDetector* drd;

#ifdef ESP32

// For ESP32
#ifndef LED_BUILTIN
#define LED_BUILTIN       2         // Pin D2 mapped to pin GPIO2/ADC12 of ESP32, control on-board LED
#endif

#define LED_OFF     LOW
#define LED_ON      HIGH

#else

// For ESP8266
#define LED_ON      LOW
#define LED_OFF     HIGH

#endif

void setup()
{
  pinMode(LED_BUILTIN, OUTPUT);
  
  Serial.begin(115200);
  Serial.println("\nStarting minimal example for ESP_DoubleResetDetector");
  
  drd = new DoubleResetDetector(DRD_TIMEOUT, DRD_ADDRESS);

  if (drd->detectDoubleReset()) 
  {
    Serial.println("Double Reset Detected");
    digitalWrite(LED_BUILTIN, LED_ON);
  } 
  else 
  {
    Serial.println("No Double Reset Detected");
    digitalWrite(LED_BUILTIN, LED_OFF);
  }
}

void loop()
{
  // Call the double reset detector loop method every so often,
  // so that it can recognise when the timeout expires.
  // You can also call drd.stop() when you wish to no longer
  // consider the next reset as a double reset.
  drd->loop();
}

Examples

Examples from other libraries

1.ESP_WiFiManager Library

2. ESPAsync_WiFiManager Library

and there are many more.

Many other libraries are depending on this library’s DRD feature

All examples of these following libraries are using DRD feature of this ESP_DoubleResetDetector Library

Example checkWaitingDRD

28a1b81298/examples/checkWaitingDRD/checkWaitingDRD.ino (L20-L132)

Debug Terminal Output Samples

1. ESP32_FSWebServer_DRD on ESP32_DEV

This is terminal debug output when running ESP32_FSWebServer_DRD on ESP32 ESP32_DEV.. Config Portal was requested by DRD to input and save Credentials. The boards then connected to WiFi AP HueNet1 using new Static IP successfully. WiFi AP HueNet1 is then lost, and board autoreconnects itself to backup WiFi AP HueNet2.

Starting ESP32_FSWebServer_DRD with DoubleResetDetect using SPIFFS on ESP32_DEV
ESP_WiFiManager v1.10.1
ESP_DoubleResetDetector v1.3.1
FS File: /ConfigSW.json, size: 150B
FS File: /CanadaFlag_1.png, size: 40.25KB
FS File: /CanadaFlag_2.png, size: 8.12KB
FS File: /CanadaFlag_3.jpg, size: 10.89KB
FS File: /edit.htm.gz, size: 4.02KB
FS File: /favicon.ico, size: 1.12KB
FS File: /graphs.js.gz, size: 1.92KB
FS File: /index.htm, size: 3.63KB
FS File: /drd.dat, size: 4B
FS File: /wifi_cred.dat, size: 192B

[WM] RFC925 Hostname = ESP32-FSWebServerDRD
[WM] setAPStaticIPConfig
[WM] setSTAStaticIPConfig for USE_CONFIGURABLE_DNS
[WM] Set CORS Header to :  Your Access-Control-Allow-Origin
Stored: SSID = HueNet2, Pass = 12345678
[WM] * Add SSID =  HueNet2 , PW =  12345678
Got stored Credentials. Timeout 120s for Config Portal
SPIFFS Flag read = 0xd0d04321
No doubleResetDetected
Saving config file...
Saving config file OK
[WM] LoadWiFiCfgFile 
[WM] OK
[WM] * Add SSID =  HueNet1 , PW =  12345678
[WM] * Add SSID =  HueNet2 , PW =  12345678
ConnectMultiWiFi in setup
[WM] ConnectMultiWiFi with :
[WM] * Flash-stored Router_SSID =  HueNet2 , Router_Pass =  12345678
[WM] * Additional SSID =  HueNet1 , PW =  12345678
[WM] * Additional SSID =  HueNet2 , PW =  12345678
[WM] Connecting MultiWifi...
[WM] WiFi connected after time:  1
[WM] SSID: HueNet1 ,RSSI= -27
[WM] Channel: 2 ,IP address: 192.168.2.232
After waiting 3.16 secs more in setup(), connection result is connected. Local IP: 192.168.2.232
HTTP server started @ 192.168.2.232
Open http://esp32-fs-browser.local/edit to see the file browser
[WM] freeing allocated params!
Stop doubleResetDetecting
Saving config file...
Saving config file OK

WiFi lost. Call connectMultiWiFi in loop
[WM] ConnectMultiWiFi with :
[WM] * Flash-stored Router_SSID =  HueNet2 , Router_Pass =  12345678
[WM] * Additional SSID =  HueNet1 , PW =  12345678
[WM] * Additional SSID =  HueNet2 , PW =  12345678
[WM] Connecting MultiWifi...
[WM] WiFi connected after time:  3
[WM] SSID: HueNet2 ,RSSI= -59
[WM] Channel: 4 ,IP address: 192.168.2.232
HHHHHHHHHH HHHHHHHHHH HHHHHHHHHH HHHHHHHHHH

2. ConfigOnDoubleReset on ESP32_DEV

This is terminal debug output when running ConfigOnDoubleReset on ESP32 ESP32_DEV.. Config Portal was requested by DRD to input and save Credentials.

Starting ConfigOnDoubleReset with DoubleResetDetect using LittleFS on ESP32_DEV
ESP_WiFiManager v1.10.1
ESP_DoubleResetDetector v1.3.1
[WM] RFC925 Hostname = ConfigOnDoubleReset
[WM] Set CORS Header to :  Your Access-Control-Allow-Origin
Stored: SSID = HueNet1, Pass = 12345678
[WM] * Add SSID =  HueNet1 , PW =  87654321
Got stored Credentials. Timeout 120s for Config Portal
LittleFS Flag read = 0xd0d04321
No doubleResetDetected
Saving config file...
Saving config file OK
[WM] LoadWiFiCfgFile 
[WM] OK
[WM] * Add SSID =  HueNet1 , PW =  jenniqqs
[WM] * Add SSID =  HueNet2 , PW =  jenniqqs
ConnectMultiWiFi in setup
[WM] ConnectMultiWiFi with :
[WM] * Flash-stored Router_SSID =  HueNet1 , Router_Pass =  jenniqqs
[WM] * Additional SSID =  HueNet1 , PW =  12345678
[WM] * Additional SSID =  HueNet2 , PW =  87654321
[WM] Connecting MultiWifi...
[WM] WiFi connected after time:  1
[WM] SSID: HueNet1 ,RSSI= -32
[WM] Channel: 2 ,IP address: 192.168.2.101
After waiting 4.43 secs more in setup(), connection result is connected. Local IP: 192.168.2.101
[WM] freeing allocated params!
HStop doubleResetDetecting
Saving config file...
Saving config file OK
HHHHHHHHH HHHHHHHHHH HHHHHHHHHH HHHHHHHHHH HHHHHHHHHH HHHHHHHHHH HHHHHHHHHH HHHHHHHHHH

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:1216
ho 0 tail 12 room 4
load:0x40078000,len:9720
ho 0 tail 12 room 4
load:0x40080400,len:6352
entry 0x400806b8

Starting ConfigOnDoubleReset with DoubleResetDetect using LittleFS on ESP32_DEV
ESP_WiFiManager Version v1.10.1
ESP_DoubleResetDetector Version v1.3.1
[WM] RFC925 Hostname = ConfigOnDoubleReset
[WM] Set CORS Header to :  Your Access-Control-Allow-Origin
Stored: SSID = HueNet1, Pass = jenniqqs
[WM] * Add SSID =  HueNet1 , PW =  jenniqqs
Got stored Credentials. Timeout 120s for Config Portal
LittleFS Flag read = 0xd0d01234
doubleResetDetected
Saving config file...
Saving config file OK
Open Config Portal without Timeout: Double Reset Detected
Starting configuration portal.
[WM] WiFi.waitForConnectResult Done
[WM] SET AP
[WM] Configuring AP SSID = ESP_9ABF498
[WM] AP PWD = your_password
[WM] AP Channel = 3
[WM] AP IP address = 192.168.4.1
[WM] HTTP server started
[WM] ESP_WiFiManager::startConfigPortal : Enter loop

3. ESPAsync_WiFi using LittleFS on ESP32S3_DEV

This is terminal debug output when running ESPAsync_WiFi on ESP32 ESP32S3_DEV.. Config Portal was requested by DRD to input and save Credentials.

Starting ESPAsync_WiFi using LittleFS on ESP32S3_DEV
ESPAsync_WiFiManager_Lite v1.8.2
ESP_DoubleResetDetector v1.3.1
LittleFS Flag read = 0xD0D01234
doubleResetDetected
Saving config file...
Saving config file OK
[WML] Hdr=ESP_WM_LITE,SSID=HueNet1,PW=12345678
[WML] SSID1=HueNet2,PW1=12345678
[WML] BName=ESP32_S3
[WML] Hdr=ESP_WM_LITE,SSID=HueNet1,PW=12345678
[WML] SSID1=HueNet2,PW1=12345678
[WML] BName=ESP32_S3
[WML] WiFi networks found:
[WML] 1: HueNet, -20dB
[WML] 2: HueNetTek, -32dB
[WML] 3: HueNet1, -39dB
[WML] 4: HueNet2, -54dB
[WML] 5: DECO-5655, -72dB
[WML] 6: Guest5655, -72dB
[WML] 7: rogers786, -76dB
[WML] 8: AT_301_WLREL6325F_f66d, -76dB
[WML] 10: Rogers 786, -78dB
[WML] 11: BELL042, -80dB
[WML] 12: WirelessMississauga, -82dB
[WML] 13: SmartRG-02a2, -87dB
[WML] 14: Jasmine, -87dB
[WML] 15: Access, -89dB
[WML] 16: Jessie, -90dB
[WML] 
stConf:SSID=ESP_E1A1DF7C,PW=MyESP_E1A1DF7C
[WML] IP=192.168.4.1,ch=10
F
Your stored Credentials :
Blynk Server1 = account.duckdns.org
Token1 = token1
Blynk Server2 = account.ddns.net
Token2 = token2
Port = 8080
MQTT Server = mqtt.duckdns.org

Libraries using ESP_DoubleResetDetector or DoubleResetDetector_Generic library

You can also see how ESP_DoubleResetDetector and DoubleResetDetector_Generic are applied in many other libraries, such as:

and the list is growing fast.

Debug

Debug is disabled by default. To enable debug:

// Use this to output debug msgs to Serial
#define DOUBLERESETDETECTOR_DEBUG       true

Troubleshooting

If you get compilation errors, more often than not, you may need to install a newer version of the ESP32 / ESP8266 core for Arduino.

Sometimes, the library will only work if you update the ESP32 / ESP8266 core to the latest version because I am using some newly added function.

Issues

Submit issues to: ESP_DoubleResetDetector issues

TO DO

Search for bug and improvement.

DONE

For ESP32 and ESP8266 (EEPROM, SPIFFS and LittleFS).
Similar features for Arduino (UNO, Mega, SAM DUE, SAMD21/SAMD51, nRF52, STM32, Teensy, etc.). Look at DoubleResetDetector_Generic
Add support to ESP32_C3, ESP32_S2
Add support to ESP32_S3 using ESP32 core v2.0.2+

Contributions and thanks

Thanks to zobix for report the bug in Isssue 2
Thanks to Tochi Moreno for enhancement request in DRD is waiting for a double reset? #14 leading to v1.3.1 to add waitingForDRD() function to signal in DRD wating period

_Zobix

_{Tochi Moreno}

Contributing

If you want to contribute to this project:

Report bugs and errors
Ask for enhancements
Create issues and pull requests
Tell other people about this library

License

The library is licensed under MIT