getCredentials() now fetches the hvac-backend broker login from Settings'
new internal service-client endpoint (GET /internal/mqtt-client/hvac-backend,
bearer SETTINGS_SECRET) — same runtime-fetch pattern as newbook.js, no
broker secret in this app's .env. Env MQTT_* vars remain a dev-only override.
Drops the MQTT_USERNAME/PASSWORD compose passthrough added earlier.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
The Intesis MHI gateway was switched from Modbus TCP to native MQTT mode
(2026-08-13), publishing retained per-signal JSON status to
hvac/mhi/IU<nn>/status/<signal> and subscribing to commands at
hvac/mhi/IU<nn>/cmd/<signal>Cmd. This adds an MQTT ingest + command path
alongside the now-dormant Modbus driver, under a new mhi_mqtt device type.
Backend:
- lib/mqtt.js: subscribe hvac/mhi/+/status/+, parse JSON payloads, auto-
register each unit as an unassigned mhi_mqtt zone_devices row and cache
live status (power/mode/setpoint/room temp/fan/health). Add
publishMhiCommand() for on/off/mode/setpoint/fan/vanes writes (QoS 1,
retain off — a retained command would replay stale on gateway reconnect).
Numeric mode/fan enums map index-for-index to the frontend label arrays.
- routes/override.js: mhi-status/mhi-control branch on device_type —
mhi_mqtt serves from the push-populated cache and publishes commands;
mhi_modbus keeps its synchronous register path unchanged.
- routes/devices.js: discover() note for mhi_mqtt (units self-register).
- No DB migration: existing status columns cover it.
Credentials: getCredentials() now prefers env-injected creds
(MQTT_BROKER_HOST/USERNAME/PASSWORD) over the settings fetch — the broker
hashes each dynsec client password show-once, so it can't be re-served from
settings at runtime. Compose passes the new env through.
Frontend: add mhi_mqtt to DeviceType/labels/implemented list, render
MhiControlPanel and count it as an AC device type.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Ports the state machine, retry/backoff, and guest-override detection from
the retired homeassistant-newbook-heating-component, without depending on
Home Assistant. Backend (Fastify/pg) + frontend (React/Vite/TS) following
standard stack conventions; LXC 128 (127 was already taken by utilities).
MHI/Midea/Daikin/boiler drivers and the shared MQTT broker (LXC 104) are
later phases/infra, not included here.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
