std-esp32-proxy

An async HTTP proxy for the ESP32 using the ESP-IDF.

How it works

The proxy works by making use of the std library exposed through the ESP-IDF.

It connects to WiFi and listens for TCP clients for whom to proxy HTTP requests. The proxying happens through a makeshift bi-directional data copy similar to tokio::io::copy_bidirectional after a CONNECT request is received and a connection to the destination is established.

Setup

Please have a look through The Rust on ESP Book for setting up the dev environment.

Depending on the espflash version, you might have to tweak .cargo/config.toml.

Configuration

There are a couple of environment variables to configure the proxy server:

• PROXY_SSID: WiFi SSID, mandatory
• PROXY_PASS: WiFi password, mandatory
• PROXY_PORT: TCP server listening port, mandatory
• PROXY_TUNNEL_TIMEOUT: Timeout for read operations in milliseconds, optional, defaults to 1000.
• PROXY_TUNNEL_BUF_SIZE: Buffer size in bytes for data copying, optional, defaults to 6144
• PROXY_NUM_SOCKETS: Maximum number of TCP sockets that can be open at the same time, optional, defaults to 16.