v1.0.0 for ESP32 + LwIP ENC28J60

### Initial Releases v1.0.0

1. Initial coding to support **ESP32 boards using LwIP ENC28J60 Ethernet**

Author: khoih-prog

README.md

@@ -0,0 +1,367 @@
+# AsyncDNSServer_ESP32_ENC
+
+
+[![arduino-library-badge](https://www.ardu-badge.com/badge/AsyncDNSServer_ESP32_ENC.svg?)](https://www.ardu-badge.com/AsyncDNSServer_ESP32_ENC)
+[![GitHub release](https://img.shields.io/github/release/khoih-prog/AsyncDNSServer_ESP32_ENC.svg)](https://github.com/khoih-prog/AsyncDNSServer_ESP32_ENC/releases)
+[![contributions welcome](https://img.shields.io/badge/contributions-welcome-brightgreen.svg?style=flat)](#Contributing)
+[![GitHub issues](https://img.shields.io/github/issues/khoih-prog/AsyncDNSServer_ESP32_ENC.svg)](http://github.com/khoih-prog/AsyncDNSServer_ESP32_ENC/issues)
+
+
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+
+
+---
+---
+
+## Table of Contents
+
+
+* [Why do we need this AsyncDNSServer_ESP32_ENC library](#why-do-we-need-this-AsyncDNSServer_ESP32_ENC-library)
+  * [Features](#features)
+  * [Why Async is better](#why-async-is-better)
+  * [Currently supported Boards](#currently-supported-boards)
+* [Changelog](changelog.md)
+* [Prerequisites](#prerequisites)
+* [Installation](#installation)
+  * [Use Arduino Library Manager](#use-arduino-library-manager)
+  * [Manual Install](#manual-install)
+  * [VS Code & PlatformIO](#vs-code--platformio)
+* [Libraries' Patches](#libraries-patches)
+  * [1. For fixing ESP32 compile error](#1-for-fixing-esp32-compile-error)
+* [HOWTO Fix `Multiple Definitions` Linker Error](#howto-fix-multiple-definitions-linker-error) 
+* [HOWTO Use analogRead() with ESP32 running WiFi and/or BlueTooth (BT/BLE)](#howto-use-analogread-with-esp32-running-wifi-andor-bluetooth-btble)
+  * [1. ESP32 has 2 ADCs, named ADC1 and ADC2](#1--esp32-has-2-adcs-named-adc1-and-adc2)
+  * [2. ESP32 ADCs functions](#2-esp32-adcs-functions)
+  * [3. ESP32 WiFi uses ADC2 for WiFi functions](#3-esp32-wifi-uses-adc2-for-wifi-functions)
+* [HOWTO Setting up the Async DNS Server](#howto-setting-up-the-async-dns-server)
+* [Examples](#examples)
+	* [ 1. AsyncCaptivePortalAdvanced_ESP32_ENC](examples/AsyncCaptivePortalAdvanced_ESP32_ENC)
+  * [ 2. AsyncCaptivePortal_ESP32_ENC](examples/AsyncCaptivePortal_ESP32_ENC) 
+  * [ 3. AsyncDNServerFull_ESP32_ENC](examples/AsyncDNServerFull_ESP32_ENC)
+  * [ 4. AsyncDNSServer_ESP32_ENC](examples/AsyncDNSServer_ESP32_ENC)
+* [Example AsyncDNSServer_ESP32_ENC](#example-AsyncDNSServer_ESP32_ENC)
+  * [1. File AsyncDNSServer_ESP32_ENC.ino](#1-file-AsyncDNSServer_ESP32_ENCino)
+* [Debug](#debug)
+* [Troubleshooting](#troubleshooting)
+* [Issues](#issues)
+* [TO DO](#to-do)
+* [DONE](#done)
+* [Contributions and Thanks](#contributions-and-thanks)
+* [Contributing](#contributing)
+* [License](#license)
+* [Copyright](#copyright)
+
+---
+---
+
+### Why do we need this [AsyncDNSServer_ESP32_ENC library](https://github.com/khoih-prog/AsyncDNSServer_ESP32_ENC)
+
+#### Features
+
+This [AsyncDNSServer_ESP32_ENC library](https://github.com/khoih-prog/AsyncDNSServer_ESP32_ENC) is a fully asynchronous DNSServer library, designed for a trouble-free, multi-connection network environment, for **ESP32 boards using LwIP ENC28J60 Ethernet**.
+
+This library is based on, modified from:
+
+1. [Develo's ESPAsyncDNSServer](https://github.com/devyte/ESPAsyncDNSServer)
+
+to apply the better and faster **asynchronous** feature of the **powerful** [AsyncDNSServer_ESP32_ENC Library](https://github.com/khoih-prog/AsyncDNSServer_ESP32_ENC) into **ESP32 boards using LwIP ENC28J60 Ethernet**.
+
+
+#### Why Async is better
+
+- Using asynchronous network means that you can handle **more than one connection at the same time**
+- You are called once the packet is ready
+- After a DNS Client connected to this Async DNS server, you are **immediately ready** to handle other connections while the Server is taking care of receiving and responding to the UDP packets in the background.
+- You are not required to check in a tight loop() the arrival of the DNS requesting packets to process them.
+- **Speed is OMG**
+
+
+#### Currently supported Boards
+
+1. **ESP32_ENC boards** using ESP32 boards with `LwIP` ENC28J60 Ethernet
+
+---
+---
+
+## Prerequisites
+
+ 1. [`Arduino IDE 1.8.19+` for Arduino](https://www.arduino.cc/en/Main/Software)
+ 2. [`ESP32 Core 2.0.5+`](https://github.com/espressif/arduino-esp32) for ESP32-based boards. [![Latest release](https://img.shields.io/github/release/espressif/arduino-esp32.svg)](https://github.com/espressif/arduino-esp32/releases/latest/)
+ 3. [`WebServer_ESP32_ENC library 1.5.1+`](https://github.com/khoih-prog/WebServer_ESP32_ENC). To install, check [![arduino-library-badge](https://www.ardu-badge.com/badge/WebServer_ESP32_ENC.svg?)](https://www.ardu-badge.com/WebServer_ESP32_ENC)
+ 4. [`AsyncUdp_ESP32_ENC library 2.0.0+`](https://github.com/khoih-prog/AsyncUdp_ESP32_ENC). To install, check [![arduino-library-badge](https://www.ardu-badge.com/badge/AsyncUdp_ESP32_ENC.svg?)](https://www.ardu-badge.com/AsyncUdp_ESP32_ENC)
+ 
+---
+---
+
+### Installation
+
+The suggested way to install is to:
+
+#### Use Arduino Library Manager
+
+The best way is to use `Arduino Library Manager`. Search for `AsyncDNSServer_ESP32_ENC`, then select / install the latest version. You can also use this link [![arduino-library-badge](https://www.ardu-badge.com/badge/AsyncDNSServer_ESP32_ENC.svg?)](https://www.ardu-badge.com/AsyncDNSServer_ESP32_ENC) for more detailed instructions.
+
+### Manual Install
+
+1. Navigate to [AsyncDNSServer_ESP32_ENC](https://github.com/khoih-prog/AsyncDNSServer_ESP32_ENC) page.
+2. Download the latest release `AsyncDNSServer_ESP32_ENC-main.zip`.
+3. Extract the zip file to `AsyncDNSServer_ESP32_ENC-main` directory 
+4. Copy the whole `AsyncDNSServer_ESP32_ENC-main` folder to Arduino libraries' directory such as `~/Arduino/libraries/`.
+
+### VS Code & PlatformIO:
+
+1. Install [VS Code](https://code.visualstudio.com/)
+2. Install [PlatformIO](https://platformio.org/platformio-ide)
+3. Install [**AsyncDNSServer_ESP32_ENC** library](https://registry.platformio.org/libraries/AsyncDNSServer_ESP32_ENC) by using [Library Manager](https://registry.platformio.org/libraries/AsyncDNSServer_ESP32_ENC/installation). Search for AsyncDNSServer_ESP32_ENC in [Platform.io Author's Libraries](https://platformio.org/lib/search?query=author:%22Khoi%20Hoang%22)
+4. Use included [platformio.ini](platformio/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](https://docs.platformio.org/page/projectconf.html)
+
+---
+---
+
+### Libraries' Patches
+
+#### 1. For fixing ESP32 compile error
+
+To fix [`ESP32 compile error`](https://github.com/espressif/arduino-esp32), just copy the following file into the [`ESP32`](https://github.com/espressif/arduino-esp32) cores/esp32 directory (e.g. ./arduino-1.8.19/hardware/espressif/cores/esp32) to overwrite the old file:
+- [Server.h](LibraryPatches/esp32/cores/esp32/Server.h)
+
+---
+---
+
+### HOWTO Fix `Multiple Definitions` Linker Error
+
+The current library implementation, using `xyz-Impl.h` instead of standard `xyz.cpp`, possibly creates certain `Multiple Definitions` Linker error in certain use cases.
+
+You can include this `.hpp` file
+
+```cpp
+// Can be included as many times as necessary, without `Multiple Definitions` Linker Error
+#include "AsyncDNSServer_ESP32_ENC.hpp"     //https://github.com/khoih-prog/AsyncDNSServer_ESP32_ENC
+```
+
+in many files. But be sure to use the following `.h` file **in just 1 `.h`, `.cpp` or `.ino` file**, which must **not be included in any other file**, to avoid `Multiple Definitions` Linker Error
+
+```cpp
+// To be included only in main(), .ino with setup() to avoid `Multiple Definitions` Linker Error
+#include "AsyncDNSServer_ESP32_ENC.h"       //https://github.com/khoih-prog/AsyncDNSServer_ESP32_ENC
+```
+
+Check the new [**multiFileProject** example](examples/multiFileProject) for a `HOWTO` demo.
+
+---
+---
+
+### HOWTO Use analogRead() with ESP32 running WiFi and/or BlueTooth (BT/BLE)
+
+Please have a look at [**ESP_WiFiManager Issue 39: Not able to read analog port when using the autoconnect example**](https://github.com/khoih-prog/ESP_WiFiManager/issues/39) to have more detailed description and solution of the issue.
+
+#### 1.  ESP32 has 2 ADCs, named ADC1 and ADC2
+
+#### 2. ESP32 ADCs functions
+
+- `ADC1` controls ADC function for pins **GPIO32-GPIO39**
+- `ADC2` controls ADC function for pins **GPIO0, 2, 4, 12-15, 25-27**
+
+#### 3.. ESP32 WiFi uses ADC2 for WiFi functions
+
+Look in file [**adc_common.c**](https://github.com/espressif/esp-idf/blob/master/components/driver/adc_common.c#L61)
+
+> In `ADC2`, there're two locks used for different cases:
+> 1. lock shared with app and Wi-Fi:
+>    ESP32:
+>         When Wi-Fi using the `ADC2`, we assume it will never stop, so app checks the lock and returns immediately if failed.
+>    ESP32S2:
+>         The controller's control over the ADC is determined by the arbiter. There is no need to control by lock.
+> 
+> 2. lock shared between tasks:
+>    when several tasks sharing the `ADC2`, we want to guarantee
+>    all the requests will be handled.
+>    Since conversions are short (about 31us), app returns the lock very soon,
+>    we use a spinlock to stand there waiting to do conversions one by one.
+> 
+> adc2_spinlock should be acquired first, then adc2_wifi_lock or rtc_spinlock.
+
+
+- In order to use `ADC2` for other functions, we have to **acquire complicated firmware locks and very difficult to do**
+- So, it's not advisable to use `ADC2` with WiFi/BlueTooth (BT/BLE).
+- Use `ADC1`, and pins GPIO32-GPIO39
+- If somehow it's a must to use those pins serviced by `ADC2` (**GPIO0, 2, 4, 12, 13, 14, 15, 25, 26 and 27**), use the **fix mentioned at the end** of [**ESP_WiFiManager Issue 39: Not able to read analog port when using the autoconnect example**](https://github.com/khoih-prog/ESP_WiFiManager/issues/39) to work with ESP32 WiFi/BlueTooth (BT/BLE)
+
+---
+---
+
+## HOWTO Setting up the Async DNS Server
+
+```cpp
+#include <AsyncDNSServer_ESP32_ENC.h>
+#include <ESPAsyncWebServer.h>
+
+const byte DNS_PORT = 53;
+
+IPAddress apIP;
+
+AsyncDNSServer dnsServer;
+
+AsyncWebServer server(80);
+
+void setup()
+{
+  ...
+  
+  ///////////////////////////////////
+
+  // To be called before ETH.begin()
+  ESP32_ENC_onEvent();
+
+  //bool begin(int MISO_GPIO, int MOSI_GPIO, int SCLK_GPIO, int CS_GPIO, int INT_GPIO, int SPI_CLOCK_MHZ,
+  //           int SPI_HOST, uint8_t *ENC28J60_Mac = ENC28J60_Default_Mac);
+  ETH.begin( MISO_GPIO, MOSI_GPIO, SCK_GPIO, CS_GPIO, INT_GPIO, SPI_CLOCK_MHZ, SPI_HOST );
+
+  // Static IP, leave without this line to get IP via DHCP
+  //bool config(IPAddress local_ip, IPAddress gateway, IPAddress subnet, IPAddress dns1 = 0, IPAddress dns2 = 0);
+  //ETH.config(myIP, myGW, mySN, myDNS);
+
+  ESP32_ENC_waitForConnect();
+
+  apIP = ETH.localIP();
+
+  ///////////////////////////////////
+
+	// modify TTL associated  with the domain name (in seconds)
+	// default is 60 seconds
+	dnsServer.setTTL(300);
+	// set which return code will be used for all other domains (e.g. sending
+	// ServerFailure instead of NonExistentDomain will reduce number of queries
+	// sent by clients)
+	// default is AsyncDNSReplyCode::NonExistentDomain
+	dnsServer.setErrorReplyCode(AsyncDNSReplyCode::ServerFailure);
+
+	// start DNS server for a specific domain name
+	dnsServer.start(DNS_PORT, "*", apIP);
+
+  ...
+}
+
+void loop() 
+{
+}
+
+```
+
+---
+---
+
+### Examples
+
+ 1. [AsyncCaptivePortalAdvanced_ESP32_ENC](examples/AsyncCaptivePortalAdvanced_ESP32_ENC)
+ 2. [AsyncCaptivePortal_ESP32_ENC](examples/AsyncCaptivePortal_ESP32_ENC)
+ 3. [AsyncDNServerFull_ESP32_ENC](examples/AsyncDNServerFull_ESP32_ENC) 
+ 4. [AsyncDNSServer_ESP32_ENC](examples/AsyncDNSServer_ESP32_ENC)
+ 
+--- 
+---
+
+### Example [AsyncDNSServer_ESP32_ENC](examples/AsyncDNSServer_ESP32_ENC)
+
+#### 1. File [AsyncDNSServer_ESP32_ENC.ino](examples/AsyncDNSServer_ESP32_ENC/AsyncDNSServer_ESP32_ENC.ino)
+
+https://github.com/khoih-prog/AsyncDNSServer_ESP32_ENC/blob/dc4ae2473b2e323cb6bc57c8c13710554ed68948/examples/AsyncDNSServer_ESP32_ENC/AsyncDNSServer_ESP32_ENC.ino#L11-L164
+
+---
+---
+
+### Debug
+
+Debug is enabled by default on Serial. To disable, use level 0
+
+```cpp
+#define ASYNC_DNS_ESP32_ENC_DEBUG_PORT      Serial
+
+// Use from 0 to 4. Higher number, more debugging messages and memory usage.
+#define _ASYNC_DNS_ESP32_ENC_LOGLEVEL_      0
+```
+
+You can also change the debugging level from 0 to 4
+
+```cpp
+#define ASYNC_DNS_ESP32_ENC_DEBUG_PORT      Serial
+
+
+// Use from 0 to 4. Higher number, more debugging messages and memory usage.
+#define _ASYNC_DNS_ESP32_ENC_LOGLEVEL_    4
+```
+
+---
+
+### Troubleshooting
+
+If you get compilation errors, more often than not, you may need to install a newer version of Arduino IDE, the Arduino `ESP32` core or depending libraries.
+
+Sometimes, the library will only work if you update the `ESP32` core to the latest version because I am always using the latest cores /libraries.
+
+
+---
+---
+
+
+### Issues
+
+Submit issues to: [AsyncDNSServer_ESP32_ENC issues](https://github.com/khoih-prog/AsyncDNSServer_ESP32_ENC/issues)
+
+---
+
+
+## TO DO
+
+ 1. Fix bug. Add enhancement
+
+
+## DONE
+
+ 1. Add support to **ESP32 boards using LwIP ENC28J60 Ethernet**
+ 2. Add more examples.
+ 3. Add debugging features
+ 4. Add astyle using `allman` style. Restyle the library
+ 
+---
+---
+
+### Contributions and Thanks
+
+1. Based on and modified from [Develo's ESPAsyncDNSServer Library](https://github.com/devyte/ESPAsyncDNSServer).
+
+
+<table>
+  <tr>
+    <td align="center"><a href="https://github.com/devyte"><img src="https://github.com/devyte.png" width="100px;" alt="devyte"/><br/><sub><b>⭐️ Develo</b></sub></a><br/></td>
+  </tr> 
+</table>
+
+---
+
+### 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 [GPLv3](https://github.com/khoih-prog/AsyncDNSServer_ESP32_ENC/blob/main/LICENSE)
+
+---
+
+## Copyright
+
+- Copyright (c) 2016- Develo
+- Copyright (c) 2022- Khoi Hoang
+
+