---
---
## Table of contents
* [Important Note for ESP32_S3](#Important-Note-for-ESP32_S3)
* [Important Change from v1.2.0](#Important-Change-from-v120)
* [Why do we need this AsyncTCP_SSL library](#why-do-we-need-this-AsyncTCP_SSL-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)
* [Note for Platform IO using ESP32 LittleFS](#note-for-platform-io-using-esp32-littlefs)
* [HOWTO Fix `Multiple Definitions` Linker Error](#howto-fix-multiple-definitions-linker-error)
* [Note for Platform IO using ESP32 LittleFS](#note-for-platform-io-using-esp32-littlefs)
* [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)
* [Orignal documentation](#Orignal-documentation)
* [AsyncSSLClient](#AsyncSSLClient)
* [Examples](#examples)
* [1. multiFileProject](examples/multiFileProject)
* [Debug Terminal Output Samples](#debug-terminal-output-samples)
* [1. AsyncHTTPSRequest_ESP on ESP32_DEV](#1-AsyncHTTPSRequest_ESP-on-ESP32_DEV)
* [2. AsyncHTTPSRequest_ESP on ESP32S2_DEV](#2-AsyncHTTPSRequest_ESP-on-ESP32S2_DEV)
* [3. AsyncHTTPSRequest_ESP on ESP32C3_DEV](#3-AsyncHTTPSRequest_ESP-on-ESP32C3_DEV)
* [4. AsyncHTTPSRequest_ESP_WiFiManager on ESP32_DEV](#4-AsyncHTTPSRequest_ESP_WiFiManager-on-ESP32_DEV)
* [5. AsyncHTTPSRequest_ESP_Multi on ESP32S3_DEV](#5-AsyncHTTPSRequest_ESP_Multi-on-ESP32S3_DEV)
* [Debug](#debug)
* [Troubleshooting](#troubleshooting)
* [Issues](#issues)
* [TO DO](#to-do)
* [DONE](#done)
* [Contributions and Thanks](#contributions-and-thanks)
* [Contributing](#contributing)
* [License](#license)
* [Copyright](#copyright)
---
---
### Important Note for ESP32_S3
**Don't use `ESP32_S3` with core v2.0.4**. Check `already fixed` [ESP32-S3 Powercycling right after uploading a sketch using Arduino IDE and Arduino Core 2.0.4 #7165](https://github.com/espressif/arduino-esp32/issues/7165)
**ESP32_S3 is OK now with core v2.0.5**
---
### Important Change from v1.2.0
Please have a look at [HOWTO Fix `Multiple Definitions` Linker Error](#howto-fix-multiple-definitions-linker-error)
---
### Why do we need this [AsyncTCP_SSL library](https://github.com/khoih-prog/AsyncTCP_SSL)
#### Features
This library is based on, modified from:
1. [Hristo Gochkov's AsyncTCP](https://github.com/me-no-dev/AsyncTCP)
2. [Maarten Fremouw's AsyncTCP](https://github.com/fremouw/AsyncTCP).
3. [Thorsten von Eicken's AsyncTCP](https://github.com/tve/AsyncTCP)
to apply the better and faster **asynchronous** feature of the **powerful** [AsyncTCP Library](https://github.com/me-no-dev/AsyncTCP) with SSL, and will be the base for future and more advanced Async libraries for ESP32, such as AsyncSSLWebServer, AsyncHTTPSRequest, etc.
#### 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 request is ready and parsed**
- When you send the response, you are **immediately ready** to handle other connections while the server is taking care of sending the response in the background
- **Speed is OMG**
- **Easy to use API, HTTP Basic and Digest MD5 Authentication (default), ChunkedResponse**
- Easily extensible to handle **any type of content**
- Supports Continue 100
- **Async WebSocket plugin offering different locations without extra servers or ports**
- Async EventSource (Server-Sent Events) plugin to send events to the browser
- URL Rewrite plugin for conditional and permanent url rewrites
- ServeStatic plugin that supports cache, Last-Modified, default index and more
- Simple template processing engine to handle templates
### Currently supported Boards
1. `ESP32` boards, such as ESP32_DEV, etc.
2. `ESP32_S2`-based boards, such as ESP32S2_DEV, ESP32_S2 Saola, etc.
3. `ESP32_C3`-based boards, such as ESP32C3_DEV, etc.
4. `ESP32_S3`-based boards, such as ESP32S3_DEV, etc., using ESP32 core `v2.0.3` or `v2.0.5+`
---
---
## Prerequisites
1. [`Arduino IDE 1.8.19+` for Arduino](https://github.com/arduino/Arduino). [](https://github.com/arduino/Arduino/releases/latest)
2. [`ESP32 Core 2.0.5+`](https://github.com/espressif/arduino-esp32) for ESP32-based boards. [](https://github.com/espressif/arduino-esp32/releases/latest/) for ESP32, ESP32_S2, ESP32_C3
3. [`ESP32 Core 2.0.4`](https://github.com/espressif/arduino-esp32) can't be used for ESP32_S3-based boards. Check `already fixed` [ESP32-S3 Powercycling right after uploading a sketch using Arduino IDE and Arduino Core 2.0.4 #7165](https://github.com/espressif/arduino-esp32/issues/7165)
---
---
## Installation
### Use Arduino Library Manager
The best and easiest way is to use `Arduino Library Manager`. Search for [**AsyncTCP_SSL**](https://github.com/khoih-prog/AsyncTCP_SSL), then select / install the latest version.
You can also use this link [](https://www.ardu-badge.com/AsyncTCP_SSL) for more detailed instructions.
### Manual Install
Another way to install is to:
1. Navigate to [**AsyncTCP_SSL**](https://github.com/khoih-prog/AsyncTCP_SSL) page.
2. Download the latest release `AsyncTCP_SSL-main.zip`.
3. Extract the zip file to `AsyncTCP_SSL-main` directory
4. Copy whole `AsyncTCP_SSL-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 [**AsyncTCP_SSL** library](https://platformio.org/lib/show/12965/AsyncTCP_SSL) by using [Library Manager](https://platformio.org/lib/show/12965/AsyncTCP_SSL/installation). Search for **AsyncTCP_SSL** 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)
---
---
### Note for Platform IO using ESP32 LittleFS
In Platform IO, to fix the error when using [`LittleFS_esp32 v1.0`](https://github.com/lorol/LITTLEFS) for ESP32-based boards with ESP32 core v1.0.4- (ESP-IDF v3.2-), uncomment the following line
from
```
//#define CONFIG_LITTLEFS_FOR_IDF_3_2 /* For old IDF - like in release 1.0.4 */
```
to
```
#define CONFIG_LITTLEFS_FOR_IDF_3_2 /* For old IDF - like in release 1.0.4 */
```
It's advisable to use the latest [`LittleFS_esp32 v1.0.5+`](https://github.com/lorol/LITTLEFS) to avoid the issue.
Thanks to [Roshan](https://github.com/solroshan) to report the issue in [Error esp_littlefs.c 'utime_p'](https://github.com/khoih-prog/ESPAsync_WiFiManager/issues/28)
---
---
### 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
```
// Can be included as many times as necessary, without `Multiple Definitions` Linker Error
#include "AsyncTCP_SSL.hpp" //https://github.com/khoih-prog/AsyncTCP_SSL
```
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
```
// To be included only in main(), .ino with setup() to avoid `Multiple Definitions` Linker Error
#include "AsyncTCP_SSL.h" //https://github.com/khoih-prog/AsyncTCP_SSL
```
Check the new [**multiFileProject** example](examples/multiFileProject) for a `HOWTO` demo.
---
---
### Note for Platform IO using ESP32 LittleFS
In Platform IO, to fix the error when using [`LittleFS_esp32 v1.0`](https://github.com/lorol/LITTLEFS) for ESP32-based boards with ESP32 core v1.0.4- (ESP-IDF v3.2-), uncomment the following line
from
```
//#define CONFIG_LITTLEFS_FOR_IDF_3_2 /* For old IDF - like in release 1.0.4 */
```
to
```
#define CONFIG_LITTLEFS_FOR_IDF_3_2 /* For old IDF - like in release 1.0.4 */
```
It's advisable to use the latest [`LittleFS_esp32 v1.0.5+`](https://github.com/lorol/LITTLEFS) to avoid the issue.
Thanks to [Roshan](https://github.com/solroshan) to report the issue in [Error esp_littlefs.c 'utime_p'](https://github.com/khoih-prog/ESPAsync_WiFiManager/issues/28)
---
---
### 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).
---
---
## Orignal documentation
For ESP32, check [AsyncTCP Library](https://github.com/me-no-dev/AsyncTCP)
This is a fully asynchronous SSL TCP library, aimed at enabling trouble-free, multi-connection network environment for Espressif's ESP32 MCUs.
### AsyncSSLClient
The base classes on which everything else is built. They expose all possible scenarios, but are really raw and require more skills to use.
---
---
### Examples
1. [multiFileProject](examples/multiFileProject). **New**
---
---
### Debug Terminal Output Samples
#### 1. AsyncHTTPSRequest_ESP on ESP32_DEV
Following is the debug terminal when running example [AsyncHTTPSRequest_ESP](https://github.com/khoih-prog/AsyncHTTPSRequest_Generic/tree/main/examples/AsyncHTTPSRequest_ESP) on ESP32_DEV to demonstrate the operation of SSL Async HTTPS request, using [AsyncTCP_SSL Library](https://github.com/khoih-prog/AsyncTCP_SSL).
```
Starting AsyncHTTPSRequest_ESP using ESP32_DEV
AsyncTCP_SSL v1.3.1
AsyncHTTPSRequest_Generic v2.1.2
Connecting to WiFi SSID: HueNet1
.......
AsyncHTTPSRequest @ IP : 192.168.2.133
**************************************
abbreviation: EDT
client_ip: aaa.bbb.ccc.ddd
datetime: 2022-09-18T01:35:32.451975-04:00
day_of_week: 0
day_of_year: 261
dst: true
dst_from: 2022-03-13T07:00:00+00:00
dst_offset: 3600
dst_until: 2022-11-06T06:00:00+00:00
raw_offset: -18000
timezone: America/Toronto
unixtime: 1663479332
utc_datetime: 2022-09-18T05:35:32.451975+00:00
utc_offset: -04:00
week_number: 37
**************************************
HHHHHH
**************************************
abbreviation: EDT
client_ip: aaa.bbb.ccc.ddd
datetime: 2022-09-18T01:36:31.992595-04:00
day_of_week: 0
day_of_year: 261
dst: true
dst_from: 2022-03-13T07:00:00+00:00
dst_offset: 3600
dst_until: 2022-11-06T06:00:00+00:00
raw_offset: -18000
timezone: America/Toronto
unixtime: 1663479391
utc_datetime: 2022-09-18T05:36:31.992595+00:00
utc_offset: -04:00
week_number: 37
```
---
#### 2. AsyncHTTPSRequest_ESP on ESP32S2_DEV
Following is the debug terminal when running example [AsyncHTTPSRequest_ESP](https://github.com/khoih-prog/AsyncHTTPSRequest_Generic/tree/main/examples/AsyncHTTPSRequest_ESP) on ESP32S2_DEV to demonstrate the operation of SSL Async HTTPS request, using [AsyncTCP_SSL Library](https://github.com/khoih-prog/AsyncTCP_SSL).
```
Starting AsyncHTTPSRequest_ESP using ESP32S2_DEV
AsyncTCP_SSL v1.3.1
AsyncHTTPSRequest_Generic v2.1.2
Connecting to WiFi SSID: HueNet1
.......
AsyncHTTPSRequest @ IP : 192.168.2.79
[ATCP] _handle_async_event: LWIP_TCP_DNS = 0x3FFE4E24
[ATCP] _handle_async_event: LWIP_TCP_DNS, name = worldtimeapi.org , IP = 213.188.196.246
[ATCP] _handle_async_event: LWIP_TCP_CONNECTED = 0x3FFE4E24 0x3FFE5024
[ATCP] _handle_async_event: LWIP_TCP_CONNECTED = 0
[ATCP] _handle_async_event: LWIP_TCP_SENT = 0x3FFE5024
[ATCP] _sent: len = 305
[ATCP] _handle_async_event: LWIP_TCP_RECV = 0x3FFE5024
[ATCP] _recv: tot_len = 1436
[ATCP] _handle_async_event: LWIP_TCP_RECV = 0x3FFE5024
[ATCP] _recv: tot_len = 1436
[ATCP] _handle_async_event: LWIP_TCP_RECV = 0x3FFE5024
[ATCP] _recv: tot_len = 1242
[ATCP] _handle_async_event: LWIP_TCP_SENT = 0x3FFE5024
[ATCP] _sent: len = 107
[ATCP] _handle_async_event: LWIP_TCP_SENT = 0x3FFE5024
[ATCP] _sent: len = 6
[ATCP] _handle_async_event: LWIP_TCP_SENT = 0x3FFE5024
[ATCP] _sent: len = 45
[ATCP] _handle_async_event: LWIP_TCP_RECV = 0x3FFE5024
[ATCP] _recv: tot_len = 51
[ATCP] _handle_async_event: LWIP_TCP_SENT = 0x3FFE5024
[ATCP] _sent: len = 106
[ATCP] _handle_async_event: LWIP_TCP_RECV = 0x3FFE5024
[ATCP] _recv: tot_len = 1016
**************************************
abbreviation: EDT
client_ip: aaa.bbb.ccc.ddd
datetime: 2022-09-18T01:46:31.858783-04:00
day_of_week: 0
day_of_year: 261
dst: true
dst_from: 2022-03-13T07:00:00+00:00
dst_offset: 3600
dst_until: 2022-11-06T06:00:00+00:00
raw_offset: -18000
timezone: America/Toronto
unixtime: 1663479991
utc_datetime: 2022-09-18T05:46:31.858783+00:00
utc_offset: -04:00
week_number: 37
**************************************
```
---
#### 3. AsyncHTTPSRequest_ESP on ESP32C3_DEV
Following is the debug terminal when running example [AsyncHTTPSRequest_ESP](https://github.com/khoih-prog/AsyncHTTPSRequest_Generic/tree/main/examples/AsyncHTTPSRequest_ESP) on ESP32C3_DEV to demonstrate the operation of SSL Async HTTPS request, using [AsyncTCP_SSL Library](https://github.com/khoih-prog/AsyncTCP_SSL).
```
Starting AsyncHTTPSRequest_ESP using ESP32C3_DEV
AsyncTCP_SSL v1.3.1
AsyncHTTPSRequest_Generic v2.1.2
Connecting to WiFi SSID: HueNet1
.........
AsyncHTTPSRequest @ IP : 192.168.2.80
**************************************
abbreviation: EDT
client_ip: aaa.bbb.ccc.ddd
datetime: 2022-09-18T01:35:32.451975-04:00
day_of_week: 0
day_of_year: 261
dst: true
dst_from: 2022-03-13T07:00:00+00:00
dst_offset: 3600
dst_until: 2022-11-06T06:00:00+00:00
raw_offset: -18000
timezone: America/Toronto
unixtime: 1663479332
utc_datetime: 2022-09-18T05:35:32.451975+00:00
utc_offset: -04:00
week_number: 37
**************************************
```
---
#### 4. AsyncHTTPSRequest_ESP_WiFiManager on ESP32_DEV
Following is the debug terminal when running example [AsyncHTTPSRequest_ESP_WiFiManager](https://github.com/khoih-prog/AsyncHTTPSRequest_Generic/tree/main/examples/AsyncHTTPSRequest_ESP_WiFiManager) on ESP32_DEV to demonstrate the operation of SSL Async HTTPS request, using [AsyncTCP_SSL Library](https://github.com/khoih-prog/AsyncTCP_SSL), and [ESPAsync_WiFiManager Library](https://github.com/khoih-prog/ESPAsync_WiFiManager)
```
Starting AsyncHTTPSRequest_ESP_WiFiManager using LittleFS on ESP32_DEV
ESPAsync_WiFiManager v1.14.1
AsyncTCP_SSL v1.3.1
AsyncHTTPSRequest_Generic v2.1.2
Stored: SSID = HueNet1, Pass = 12345678
Got stored Credentials. Timeout 120s
ConnectMultiWiFi in setup
After waiting 11.38 secs more in setup(), connection result is connected. Local IP: 192.168.2.232
H
**************************************
abbreviation: EDT
client_ip: aaa.bbb.ccc.ddd
datetime: 2022-09-18T01:36:31.992595-04:00
day_of_week: 0
day_of_year: 261
dst: true
dst_from: 2022-03-13T07:00:00+00:00
dst_offset: 3600
dst_until: 2022-11-06T06:00:00+00:00
raw_offset: -18000
timezone: America/Toronto
unixtime: 1663479391
utc_datetime: 2022-09-18T05:36:31.992595+00:00
utc_offset: -04:00
week_number: 37
**************************************
H
```
---
#### 5. AsyncHTTPSRequest_ESP_Multi on ESP32S3_DEV
Following is the debug terminal when running example [AsyncHTTPSRequest_ESP_Multi](https://github.com/khoih-prog/AsyncHTTPSRequest_Generic/tree/main/examples/AsyncHTTPSRequest_ESP_Multi) on **ESP32S3_DEV on ESP32 core v2.0.5** to demonstrate the operation of SSL Async HTTPS request, using [AsyncTCP_SSL Library](https://github.com/khoih-prog/AsyncTCP_SSL)
```
Starting AsyncHTTPSRequest_ESP_Multi on ESP32S3_DEV
AsyncTCP_SSL v1.3.1
AsyncHTTPSRequest_Generic v2.1.2
Connecting to WiFi SSID: HueNet1
...
AsyncHTTPSRequest @ IP : 192.168.2.187
Sending request: https://worldtimeapi.org/api/timezone/Europe/Prague.txt
Sending request: https://www.myexternalip.com/raw
[AHTTPS] _onError handler SSL error = OK
[AHTTPS] _onError handler SSL error = OK
**************************************
[AHTTPS] Response Code = HTTP OK
**************************************
aaa.bbb.ccc.ddd
**************************************
**************************************
[AHTTPS] Response Code = HTTP OK
**************************************
abbreviation: CEST
client_ip: aaa.bbb.ccc.ddd
datetime: 2022-09-18T07:50:04.395849+02:00
day_of_week: 0
day_of_year: 261
dst: true
dst_from: 2022-03-27T01:00:00+00:00
dst_offset: 3600
dst_until: 2022-10-30T01:00:00+00:00
raw_offset: 3600
timezone: Europe/Prague
unixtime: 1663480204
utc_datetime: 2022-09-18T05:50:04.395849+00:00
utc_offset: +02:00
week_number: 37
**************************************
Sending request: https://worldtimeapi.org/api/timezone/America/Toronto.txt
**************************************
[AHTTPS] Response Code = HTTP OK
**************************************
abbreviation: EDT
client_ip: aaa.bbb.ccc.ddd
datetime: 2022-09-18T01:50:05.382100-04:00
day_of_week: 0
day_of_year: 261
dst: true
dst_from: 2022-03-13T07:00:00+00:00
dst_offset: 3600
dst_until: 2022-11-06T06:00:00+00:00
raw_offset: -18000
timezone: America/Toronto
unixtime: 1663480205
utc_datetime: 2022-09-18T05:50:05.382100+00:00
utc_offset: -04:00
week_number: 37
**************************************
H
```
---
---
### Debug
Debug is enabled by default on Serial.
You can also change the debugging level `_ASYNC_TCP_SSL_LOGLEVEL_` from 0 to 4 in the sketch
```cpp
#define _ASYNC_TCP_SSL_LOGLEVEL_ 1
```
---
### Troubleshooting
If you get compilation errors, more often than not, you may need to install a newer version of the core for Arduino boards.
Sometimes, the library will only work if you update the board core to the latest version because I am using newly added functions.
---
---
### Issues
Submit issues to: [AsyncTCP_SSL issues](https://github.com/khoih-prog/AsyncTCP_SSL/issues)
---
## TO DO
1. Search for bug and improvement.
2. Similar Async SSL libraries for ESP8266, STM32, Portenta_H7 and many other boards
3. Permit both HTTP and HTTPS
---
## DONE
1. Add support to ESP32 using SSL
2. Add Table of Contents
3. Add debug feature
4. Fix `multiple-definitions` linker error
5. Add examples
6. Remove hard-code if possible
7. Improve debug messages by adding functions to display `error/state messages` instead of `cryptic error/state number`
8. Add support to `ESP32_S3`, using ESP32 core `v2.0.3` or `v2.0.5+`. **Don't use `ESP32_S3` with core v2.0.4**. Check `already fixed` [ESP32-S3 Powercycling right after uploading a sketch using Arduino IDE and Arduino Core 2.0.4 #7165](https://github.com/espressif/arduino-esp32/issues/7165)
9. Increase `ASYNC_QUEUE_LENGTH` to default **512 from 32** and make it user-configurable
10. Increase `ASYNC_TCP_PRIORITY` to default **10 from 3**, and make it user-configurable
---
---
### Contributions and Thanks
Many thanks for everyone for bug reporting, new feature suggesting, testing and contributing to the development of this library.
### Contributions and Thanks
1. Based on and modified from [Hristo Gochkov's AsyncTCP](https://github.com/me-no-dev/AsyncTCP). Many thanks to [Hristo Gochkov](https://github.com/me-no-dev) for great [AsyncTCP Library](https://github.com/me-no-dev/AsyncTCP)
2. Based on [Maarten Fremouw's AsyncTCP Library](https://github.com/fremouw/AsyncTCP).
3. Based on [Thorsten von Eicken's AsyncTCP Library](https://github.com/tve/AsyncTCP).
 ⭐️⭐️ Hristo Gochkov |
 Maarten Fremouw |
 Thorsten von Eicken |