93 lines
5.7 KiB
Markdown
93 lines
5.7 KiB
Markdown
# Jervis Voice Assistant — System Overview
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> Single source of truth for the local voice-assistant system on Sam's home lab.
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> Companion docs: **`agent-api.md`** (how to send a command / get a reply) and **`clients.md`** (type-it, web, Android gateways).
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> Component repos: `voice_assistant` (ESP32 firmware), `voice_bridge` (STT bridge), `voice_agent` (this brain), `speech_piper` (TTS).
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---
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## What it does
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A fully-local, private voice assistant. You say **"Hey Jervis"**, then a natural-language request; it answers, controls the house, manages your shopping list, and speaks back through your speakers. The **design principle: one LLM "brain"** decides what to do, and calls tools. Home Assistant is *one of those tools* — not the decision maker.
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---
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## Architecture
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```
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┌─ Input ───────────────────────────────────────────────────────────────┐
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│ ESP32-S3 ("Hey Jervis" wake word, INMP441 mic, WS2812 LED ring) │
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│ └→ MQTT voice/audio_stream (broker .13:1883) │
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│ voice_bridge (docker .13) — wake word, buffer audio │
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│ └→ HTTP :5000 │
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│ voice_whisper (docker .13, faster-whisper) — STT audio→text │
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│ └→ publish text → MQTT homeassistant/voice/text (broker .30) │
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│ ALSO: any client → POST http://.13:8501/voice {text} (see clients.md)│
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└───────────────────────────────────────────────────────────────────────┘
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│ text
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▼
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┌─ Brain ── voice-agent (systemd service on .13:8501) ─────────────────┐
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│ LLM = OmniRoute (OpenAI-compatible, tool-calling) │
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│ Model: auto/best-fast │
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│ LLM decides intent → calls a TOOL: │
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│ • get_time / get_weather / answer (Open-Meteo, LLM) │
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│ • add_shopping_item → KitchenOwl API (shopping list) │
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│ • control_ha / ha_service_cmd → Home Assistant REST API │
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│ • feed_fish → HA input_button.fish_feeder │
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│ • set_reminder → HA persistent_notification │
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│ • speak_as(voice,text) → piper per-character voice │
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│ • play_music → Mopidy (planned) │
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└───────────────────────────────────────────────────────────────────────┘
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│ reply text
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▼
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┌─ Output ─────────────────────────────────────────────────────────────┐
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│ piper_tts (docker .13) → speak_direct.sh → Snapcast → all speakers │
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└───────────────────────────────────────────────────────────────────────┘
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```
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**Key design decision:** the agent is the single brain; **Home Assistant is a passive device the agent commands via its REST API** — no per-action HA automation/subscription is needed for the agent's commands (one long-lived HA token enables all HA control).
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---
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## Components (`host/IP/port/repo`)
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| Component | Host/IP | Port | Repo / path | Role |
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| ESP32-S3 | — | — | `sam/voice_assistant` | Wake word, mic, LED |
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| voice_bridge | `.13` | docker | `sam/voice_bridge` | Wake word + audio buffer |
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| voice_whisper | `.13` | `:5000` | `sam/voice_bridge` | faster-whisper STT |
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| **voice-agent** | `.13` | **`:8501`** | `sam/voice-assistant` | LLM brain + tools |
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| OmniRoute | `.13` | `:20129` (API) | — | LLM gateway (OpenAI-compatible) |
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| piper_tts | `.13` | `:10200` | `sam/speech_piper` | TTS (Wyoming) |
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| Snapcast | `.13` | `:1780` | — | Multi-room audio |
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| Mopidy / librespot | `.13` | `:6600`/`:6680` | — | Music sources |
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| Home Assistant | `.30` | `:8123` (REST) | — | Home control |
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| KitchenOwl | `.35` | `owl.lab.audasmedia.com.au` | — | Shopping list |
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| mosquitto | `.13` + `.30` | `:1883` | — | MQTT brokers |
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---
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## Data flow summary
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1. ESP32 streams audio to **voice_bridge** (MQTT on `.13`).
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2. **voice_bridge** detects the wake word, buffers, sends to **voice_whisper**.
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3. **voice_whisper** (faster-whisper) returns text.
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4. Text is published to MQTT `homeassistant/voice/text` (broker `.30`) **and/or** POSTed to the agent.
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5. **voice-agent** (LLM) decides intent and calls a tool.
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6. Reply text → **piper** → **Snapcast** → speakers.
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---
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## Run / manage
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- Agent service (persistent, auto-starts): `systemctl status voice-agent` (NixOS systemd unit declared in `/etc/nixos/configuration.nix`). Restart: `sudo systemctl restart voice-agent`.
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- Logs: `journalctl -u voice-agent` / `journalctl -u snapserver`.
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- Firewall: port `8501` is in `allowedTCPPorts` in the NixOS config.
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## Repository map (other related projects)
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- `sam/voice_assistant` — ESP32 firmware
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- `sam/voice_bridge` — STT bridge + whisper
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- `sam/speech_piper` — TTS scripts/models → Snapcast
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- `sam/voice-assistant` — **this** overview + API contract + clients
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- `sam/family_home_lab` — console portal / dsh |