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Send data to and from any device running anywhere, big or small: cloud servers, tablets, or embedded systems. The core peer-to-peer technology is open source and built on open standards, so you’re never locked in.

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Operating Systems

iroh supports all major operating systems.

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Hardware

iroh is regularly tested on a wide range of hardware, from servers to microcontrollers. For hardware you don’t see here, or to integrate your custom hardware into our testing frameworks on every iroh release, contact us.

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Microcontrollers

iroh can run as a full QUIC endpoint on microcontrollers, using the same endpoint IDs, tickets, and protocols as it would on a server. What a device can do mostly comes down to its available RAM and flash:
  • RAM. With PSRAM, a device has room for the relay client and pkarr address lookup. That means you can connect to it from anywhere, including from a browser via WebAssembly.
  • Without PSRAM (~512 KiB internal SRAM), the relay client and pkarr address lookup won’t fit. You can still connect on the local network using a long ticket that includes the device’s IP address, or discover it by endpoint ID with mDNS. Browsers can’t connect this way because they don’t support mDNS or direct UDP.
  • Flash. Devices with less than 8 MiB of flash need our reduced-dependency build of iroh. Common 4 MiB development boards fit with a little size tuning (opt-level = "z", panic = "immediate-abort", and -Os on the ESP-IDF side), with no custom partition table required.

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ESP32

The RISC-V variants (ESP32-C*, ESP32-P*) build with stock Rust. Xtensa (ESP32, ESP32-S3) needs the esp Rust toolchain. The ESP32-P4 has no radio of its own. WiFi comes from an ESP32-C6 companion over ESP-Hosted.
You’ll find working firmware for every variant above, along with a desktop CLI and browser (WebAssembly) client, in iroh-esp32-examples. For a complete example, see iroh-smart-fan: a PSRAM ESP32 that reads a temperature sensor and drives a fan over irpc, with controls available from a terminal or browser.

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RP2350

iroh also runs on RP2350-based devices. With WiFi and sufficient PSRAM, relay and address lookup are enabled, so you can connect to these boards from anywhere. For a technical walkthrough of the Rust std port, WiFi, PSRAM, display support, and a working iroh endpoint, read iroh on RP2350. RP2350 doesn’t yet have an upstream Rust std target, so we built one. It uses nightly Rust with a custom Cortex-M33 target, the Pico SDK for startup, USB, and the radio, FreeRTOS for threads, newlib, and lwIP for networking. iroh builds on top without modification. Contact us for production support.

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Network Transports

If there is a transport you need that is not listed, contact us.