n_signer/firmware/README.md

Firmware Scaffolding

This directory is the placeholder for the future microcontroller variant of nsigner.

Current direction

Initial MCU work should reuse platform abstractions that already exist in nostr_core_lib, especially the ESP32 platform files under nostr_core_lib/platform/esp32/:

• nostr_platform_esp32.c
• nostr_http_esp32.c
• nostr_websocket_esp32.c

Intended purpose

This firmware target is for a USB signer and constrained-device signer profile, with nsigner protocol compatibility and transport adaptation (USB-CDC first, then other embedded transport options as needed).

Next milestones

1. Add MCU-specific build system (ESP-IDF/CMake or equivalent).
2. Add a minimal signer main loop with version reporting compatible with desktop nsigner semantics.
3. Implement transport bridge framing compatible with host-side nsigner-bridge plans.
4. Add hardware confirmation UX hooks (button + tiny display flow).