.session_nest_snapshot_20260729.md

.session_nest_snapshot_20260729.md

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+# Nest Snapshot Session — July 29, 2026
+
+## Goal
+Capture still images from Nest cameras (Google Nest SDM API, `supported_features: 2` — streaming only) for AI (Ollama) analysis.
+
+## What Was Built
+
+### Custom Integration: `nest_snapshot`
+Location: `/homeassistant/custom_components/nest_snapshot/`
+
+3 files:
+- **manifest.json** — domain `nest_snapshot`, depends on `nest`, no extra requirements
+- **services.yaml** — `capture` service with `entity_id` (camera, required) and `filename` (template string, optional)
+- **__init__.py** — Main logic: resolves Nest config entry → gets `CameraLiveStreamTrait` → creates `RTCPeerConnection` → generates SDP offer → calls `trait.generate_web_rtc_stream(offer_sdp)` → receives one `av.VideoFrame` → saves JPEG via PIL → cleans up
+
+### Config Change
+- `/homeassistant/configuration.yaml` — line `nest_snapshot:` appended at end
+
+### Test Automation
+- **`automation.test_nest_snapshot_capture`** — manual trigger, calls `nest_snapshot.capture` on `camera.front_door_front_door` → `/media/nest_snapshot_test_{{ now().strftime('%Y%m%d_%H%M%S') }}.jpg`
+
+## Key Technical Details
+- Nest cameras do NOT support `camera.snapshot`, `camera.record`, `camera.play_stream`, `camera.get_stream_source`, or `camera_proxy` — all return errors or placeholders
+- Working approach: one-shot WebRTC stream via `google-nest-sdm` + `aiortc` inside HA's Python env
+- `aiortc` and `PIL` are NOT available in this MCP add-on container — they live in HA's separate Python environment. All WebRTC/SDP handling runs inside HA.
+- HA version: `2026.7.4`
+- Primary test camera: `camera.front_door_front_door`
+- Blink cameras work fine with `blink.trigger_camera` → `camera.snapshot` (separate flow)
+
+## To Resume Testing
+1. **Restart HA** — required for `nest_snapshot` component to load
+2. Verify service `nest_snapshot.capture` appears in Developer Tools → Services
+3. Trigger automation `automation.test_nest_snapshot_capture` (or call service manually)
+4. Check `/media/` for output file (>10 KB = success, ~1-2 KB = placeholder)