This is a fork of Yuris fork of ESP-Serial-bridge with a Wireguard VPN client built into it so it can be used with mobile connections that cannot forward ports.

https://github.com/ciniml/WireGuard-ESP32-Arduino

Yuri's Notes

This fork is compatible with both the ESP32 As is, the sketch will compile, build, and upload without errors for the ESP32.
There are many configurable parameters in config.h. Edit to suit your needs - inline comments should provide clarity.

Major update, Apr 2023:

• Fixed compatibility with Arduino framework 2.0
• Added compatibility with PlatformIO.
• Implemented PROTOCOL_UDP (UDP broadcast)
• PROTOCOL_TCP and PROTOCOL_UDP can be used simultaneously, though doing so may result in serial traffic conflicts if your client connections are not managed carefully.
• Added ESP32-Serial-WiFi-Client.ino in a separate sketch folder to make an ESP32 TCP or UDP client that connects to the ESP-Serial-Bridge. Edit client_config.h and upload to a second board.
• Multiple bugs (possible buffer overruns) are fixed in the latest commit(s).
• Latest commits also include some styling/readability edits, though I can easily admit that it isn't the "prettiest" of C++ projects.

ESP32-Serial-Bridge

Transparent WiFi (TCP) to all three UART Bridge, supports both AP and STATION WiFi modes. The .ino file is the code for the ESP32. Use Arduino IDE for ESP32 to compile and upload it to the ESP32. I made this project in order to connect Flight equipment devices devices like (Radio, Vario FLARM), to a Flight Computer (Kobo, Smartphones etc.), but it is not limited to that. You can use it wherever you want, but on your own risk. Read license file for more details.

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Used Libraries: (must be installed in the arduino IDE):

https://github.com/espressif/arduino-esp32

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In some cases the memorylayout is to small for this scetch. If you face this problem you can either disable Bluetooth by removing #define BLUETOOTH in config.h or change the partition size as described here: https://desire.giesecke.tk/index.php/2018/04/20/change-partition-size-arduino-ide/

Arduino hardware configuration:

https://github.com/AlphaLima/ESP32-Serial-Bridge/blob/master/Settings.jpg

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example usecases:

https://www.youtube.com/watch?v=K2Hia06IMtk

https://www.youtube.com/watch?v=GoSxlQvuAhg

Hardware

here is the wiring diagram recomendation: https://raw.githubusercontent.com/AlphaLima/ESP32-Serial-Bridge/master/ESP32-SerialBridge.jpg
Pinning
COM0 Rx <-> GPIO21
COM0 Tx <-> GPIO01
COM1 Rx <-> GPIO16
COM1 Tx <-> GPIO17
COM2 Rx <-> GPIO15
COM2 Tx <-> GPIO04

NOTE: The PIN assignment has changed and may not look straigt forward (other PINs are marke as Rx/Tx), but this assignment allows to flash via USB also with hooked MAX3232 serial drivers.

I recomend to start your project with a Node32s or compatible evaluation board. For a TTL to RS232 level conversion search google for "TTL RS3232 Converter"

https://tech.scargill.net/wp-content/uploads/2017/05/ESP326.jpg