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Admin-configured SMTP (server/port/username/password/from address/ STARTTLS, a singleton server_settings row set from /admin -- not env vars, since it's operator infrastructure a household admin sets up once through the UI) powers two features, both requiring the relevant user to have an email set in their own Settings: - "Forgot password?" on /login emails a one-hour single-use reset link (password_reset_tokens table). The endpoint always returns the same generic "check your email" response regardless of whether the address matched an account, so it can't be used to enumerate registered users. - A frame's Configuration tab can set a battery-alert threshold (Frame.battery_alert_threshold_pct, -1 = disabled); POST /frame/battery emails the owner the first time a report drops to or below it, then stays quiet for the rest of that discharge cycle (battery_alert_sent, reset alongside battery_history whenever the existing recharge-jump detection fires) -- not once per wake. New app/mail.py wraps stdlib smtplib (no new dependency); send_email() never raises, so a broken mail server can't 500 a battery report or a password-reset request. Schema migration v2 adds users.email and the two frame columns via ALTER TABLE (safe against the live, already- populated database) plus the two new tables via the existing create_all-based migration runner. Verified against a real (already-migrated, real user/frame data) database: the v1->v2 migration, admin SMTP config + test-email button, full forgot/reset-password roundtrip (including single-use token invalidation and the no-enumeration response), and the battery alert firing exactly once per crossing against a hand-rolled fake SMTP server -- all via curl end-to-end, plus the standing legacy-device curl suite to confirm the device protocol is untouched.
ESPresso Frame
A DIY e-ink photo frame: an ESP32-C6 pulls photos from your Immich library and displays them on a 7.3" full-color e-paper panel, waking on a timer to refresh and spending the rest of its time in deep sleep.
- No cables to a computer, no SD card shuffling. Provisioning is a captive portal with a QR code drawn on the panel itself -- scan, join, fill in your WiFi and server address, done.
- The frame never decodes an image. A small self-hosted server does all the work (pulling from Immich, cropping, dithering, packing into the panel's exact pixel format) and hands the device a stream it can write straight to SPI. The ESP32-C6 has no PSRAM and not much SRAM to spare -- keeping it a dumb display client is what makes that workable.
- Crops toward faces, not just the center, using face bounding boxes Immich already computed for its own People feature -- no bundled face detector.
- Refresh interval and album are configurable from a web UI, no reflashing needed to change them.
Hardware
- ESP32-C6 dev board (8MB flash)
- Waveshare 7.3" E Ink Spectra 6 (E6) panel -- 800x480, 6-color, SPI
See docs/hardware.md for wiring and
docs/architecture.md for how the two halves talk
to each other.
Getting started
server/-- run the FastAPI server first (Docker Compose, points at your Immich instance). Seeserver/README.md.firmware/-- build and flash the ESP32-C6, then scan the QR codes it draws on first boot to provision it. Seefirmware/README.md.
Repo layout
firmware/ ESP-IDF project for the ESP32-C6
server/ FastAPI server: Immich -> crop/dither/pack -> the frame
docs/ Wiring and architecture notes
License
MIT -- see LICENSE. A few small pieces of vendored
third-party code (a QR code generator, a bitmap font table) keep their
own permissive licenses; see LICENSE for details.
Built with substantial assistance from Claude Code.