README.md

ESP32-to-ESP32

ESP32 to ESP32 communication example using Arduino framework. Secure, P2P, low latency connection between devices is established. Button connected to the first ESP32 controlls LED connected to second ESP32.

• ESP32 acts both as a HTTP server (based on ESPAsyncWebServer library) and HTTP client (based on AsyncTCP)
• ESP32 automatically detects all peers in the same Husarnet VPN network
• when the button is pressed, HTTP request is sent to all other peers and turn the LED on
• when the button is released, HTTP request is sent to all other peers and turn on the LED off

Default hardware configuration:

• LED is connected to pin: 27
• button is connected to pin: 0

Running a project

1. Clone this repo

2. Open the repo folder using VSC with installed Platformio extension

3. Provide your Wi-Fi networks credentials here:

// WiFi credentials
const char* wifiNetworks[][2] = {
  {"wifi-ssid-one", "wifi-pass-one"},
  {"wifi-ssid-two", "wifi-pass-two"},
} 

4. Get your Husarnet VPN Join Code (allowing you to connect devices to the same VPN network)

You will find your Join Code at https://app.husarnet.com
-> Click on the desired network
-> Add element button
-> Join Code tab

5. Place your Husarnet Join Code here:

const char *husarnetJoinCode = "fc94:b01d:1803:8dd8:b293:5c7d:7639:932a/xxxxxxxxxxxxxxxxxxxxxx";

6. Flash at least two ESP32 devices and enjoy

Note that each ESP32 runs it's own HTTP server, so you can test not only ESP32 <> ESP32 communication but also web browser <> ESP32 (by just typing http://random:8001/led/1/state/0). Remember to use the same Join Code to connect your laptop to the same VPN network as ESP32.

Extra notes

If you want to add Over The Air (OTA) firmware update from GitHub Actions workflow, check out this project - https://github.com/husarnet/esp32-internet-ota