Add support for ESP Thread Border Router board - Ready Made Project

[el-bakkali]

Describe the component you'd like

A new ESPHome component: an OpenThread Border Router that communicates with an ESP32-H2 RCP over UART.

Why this matters:

• This is Espressif's official Thread Border Router reference design (S3 + H2)
• It's Thread 1.3 certified
• The board is cheap (~$20) and widely available
• Currently requires building from source via esp-idf + esp-thread-br, which is complex for end users

Use case: Ready-to-flash Thread/Matter border router for Home Assistant without needing to compile firmware manually.

What are your use cases for this component?

This would involve:

• ESPHome integrating the esp-thread-br stack (or esp-idf's ot_br example)
• Supporting UART-based RCP communication
• Pre-built OpenThread RCP firmware for H2 (from esp-idf's ot_rcp example)

Is there a public datasheet, documentation and/or schematics?

References:

• ESPHome esp32_hosted docs
• ESP Thread Border Router docs
• esp-thread-br GitHub
• Espressif Thread BR dev blog

Anything else?

A ready made project here would be amazing to bring functionality to this board https://esphome.io/projects/

To add some more context, this seems like a good opportunity to bring native OpenThread Border Router support to ESPHome, especially with Matter adoption growing.

I've checked and ESPHome already provides precompiled binaries for the esp-hosted architecture here:
https://github.com/esphome/esp-hosted-firmware

Currently there's firmware for ESP32 and C6, but none for S3 or H2. Adding support for the S3+H2 combo would unlock the official Espressif Thread Border Router board, which is Thread 1.3 certified and costs ~$20.

The infrastructure is already there, it's just missing the S3/H2 builds.

I've also submitted this as a feature request on the ESPHome GitHub for better visibility with maintainers.