GrowCast

GrowCast is a Next.js web app for a live garden: climate, energy, gallery, an OBS overlay, and Twitch broadcast, with a protected admin panel.

1. Project Overview

What the app does

GrowCast lets you share your grow in real time. Visitors see the live stream, climate, energy, and media. Admin users update the grow from the settings pages.

Key features

• Live stream embed on the homepage (an RTSP camera through MediaMTX, RTSP to HLS)
• Public grow dashboard, gallery, and energy
• Live tent climate from the Spider Farmer sidecar
• Timelapse snapshots and video
• OBS overlay at /overlay and the Broadcast page (/admin/stream) for music, alerts, Twitch, and camera look
• Settings bands with in-page save

2. Demo

To see a live demo, visit my instance. The official project site is growcast.0xmarcel.com.

3. Getting Started

Prerequisites

• Docker Engine and the Docker Compose plugin
• Node.js 20 LTS or newer, and npm, when you want npm run dev or npm run setup:admin

A camera, MediaMTX, and Cloudflare are for publishing a stream. They are not required to open the site.

Installation

Clone the repository and start the stack:

docker compose up --build -d

That builds and starts the website, the climate sidecar, the Twitch restream image, and the timelapse worker. The first build downloads Chromium for the restream image and can take a while.

Open http://localhost:3000. Until an admin account exists, the site opens the setup wizard. The container log prints a setup code (docker compose logs growcast). Enter that code on the first step, then create the admin login. The wizard also asks which sidecars to configure:

• Climate: Spider Farmer email and password. One controller is saved automatically. Several controllers ask you to choose.
• Twitch: stream key and channel. Start stays on Broadcast.
• Timelapse: camera RTSP URL, interval, and timezone.

The mesh token is generated on first boot and shared with the sidecars. You do not paste it.

npm run setup:admin still writes .env.local for an admin account created outside the wizard. Passwords must be at least 12 characters. For local/dev only:

npm run setup:admin:insecure
# or: npm run setup:admin -- --allow-insecure

(Do not use npm run setup:admin --allow-insecure — npm treats that as its own config, not a script argument.)

An account already present in .env.local skips the wizard.

Environment variables

.env.local is optional. Compose loads it when the file exists (env_file required: false).

ADMIN_USERNAME=your_admin_username
ADMIN_PASSWORD_HASH=scrypt$...$...
ADMIN_SESSION_SECRET=at_least_32_chars_random_secret
GROWCAST_MESH_TOKEN=optional_existing_token

Notes:

• ADMIN_PASSWORD_HASH must use the scrypt$... format.
• ADMIN_SESSION_SECRET must be at least 32 characters.
• When GROWCAST_MESH_TOKEN is set, that value is copied to data/mesh.token and the sidecars use it. When it is unset, the container creates one token on first boot.
• Admin passwords must be at least 12 characters (npm run setup:admin and the wizard enforce this). For local/dev only, use npm run setup:admin:insecure (or npm run setup:admin -- --allow-insecure).
• Admin sessions last 24 hours and live in memory. docker compose up --build recreates the website container and signs you out. Sign in again.
• Optional, Broadcast channel lookup and Twitch EventSub alerts (GrowCast .env.local, not the restream sidecar): TWITCH_CLIENT_ID and TWITCH_CLIENT_SECRET. EventSub webhooks also need GROWCAST_PUBLIC_URL (the public HTTPS origin, e.g. the Cloudflare Tunnel hostname).

Logging

GrowCast writes human-readable logs to stdout so docker compose logs shows the setup code, auth events, and request lines without a JSON parser. Set LOG_FORMAT=json for one JSON object per line (log shipping). Correlation IDs are set in the Next.js proxy (X-Request-ID on responses). Optional env vars: LOG_LEVEL, LOG_FORMAT, GROWCAST_ENV.

Full schema, event catalog, redaction rules, Docker log shipping, retention guidance, and alert examples: docs/logging.md.

4. Running the Application

Docker Compose

docker compose up --build -d is the supported start command. It runs four services from docker-compose.yml: growcast, ggs, restream, and timelapse.

For production, put the origin behind a Cloudflare Tunnel (HTTPS public hostname → http://127.0.0.1:3000). Compose publishes on ${GROWCAST_BIND:-127.0.0.1}:${GROWCAST_PORT:-3000} (loopback unless you set GROWCAST_BIND=0.0.0.0 for a LAN) and sets GROWCAST_TRUST_PROXY=1. Login rate-limits use CF-Connecting-IP, then X-Real-IP, then the first X-Forwarded-For hop, which Caddy sends by default. Those headers are ignored unless the flag is set. Admin cookies are Secure when X-Forwarded-Proto: https or CF-Connecting-IP is present (or COOKIE_SECURE=1). Direct HTTP to a public :3000 is not the supported admin path.

Local-only UI: http://localhost:3000 (session cookie is not Secure).

Useful commands:

docker compose up --build -d
docker compose logs -f growcast
docker compose down

docker compose up --build -d recreates the website container and signs you out. Sessions stay in memory for 24 hours or until logout. Sign in again.

What gets persisted on the host:

• ./data -> /app/data (grow data, mesh token, sidecar env files, restream state)
• ./extensions/GrowCast-Timelapse -> /app/extensions/GrowCast-Timelapse (snapshots and timelapse video)
• ./public/setup -> /app/public/setup
• ./public/yourPictures -> /app/public/yourPictures

The website writes data/ggs.env for the climate sidecar and data/timelapse.env for the camera URL. Those files live on the ./data directory mount, so Docker does not create a directory in place of a missing env file. The climate and timelapse containers read those files and reload their processes when the files change.

Sidecars without credentials wait, then start when the wizard (or admin settings) writes the config. Twitch restream stays idle until you save a stream key and press Start on Broadcast (/admin/stream). GrowCast writes data/restream/capture.token on its own; GROWCAST_RESTREAM_TOKEN in .env.local is an optional override.

Broadcast (/admin/stream) previews the 1920×1080 program with background music (uploaded playlist or a stream URL; URL wins while set) and on-stream alerts (manual Send alert, plus Twitch follow/sub/raid/bits after Connect Twitch). Public /overlay and the homepage stay silent.

The website container runs as uid 1001 (growcast). The entrypoint chowns ./data, the upload folders, and the timelapse snapshots and timelapse directories so the process can write them. It does not change ownership of the plugin source, so a later git pull still works. After the first run those data folders are owned by 1001:1001 on the host. The climate and timelapse sidecars use the same uid so they can read ./data.

Optional address:

• The compose file publishes ${GROWCAST_BIND:-127.0.0.1}:${GROWCAST_PORT:-3000}:3000.
• Set GROWCAST_PORT for a different port, or GROWCAST_BIND=0.0.0.0 to reach the site from other machines on the LAN.

MediaMTX stays outside this compose file. .env.local, media folders, and data/ are provided at runtime and are not baked into the image.

Development

npm run dev

Open http://localhost:3000.

Production build and start

npm run build
npm run start

This starts the standard Next.js production server. The Docker image builds a standalone bundle automatically during docker compose build.

5. Project Structure

app/
  (site)/page.tsx              # Public dashboard
  (site)/gallery/page.tsx      # Gallery
  (site)/energy/page.tsx       # Energy
  overlay/page.tsx             # OBS overlay
  setup/page.tsx               # First-run wizard
  admin/page.tsx               # Admin login + grow settings
  admin/stream/page.tsx        # Broadcast
  admin/ggs/page.tsx           # Climate and energy settings
  admin/timelapse/page.tsx     # Timelapse settings
extensions/
  GrowCast-GGS/                # Climate sidecar
  GrowCast-Restream/           # Twitch restream sidecar
  GrowCast-Timelapse/          # Timelapse sidecar and media
data/
  mesh.token                   # Shared sidecar token, created on first boot
  ggs.env                      # Climate credentials written by the wizard
  timelapse.env                # Camera URL written by the wizard

6. Camera (MediaMTX)

The homepage player uses a browser HLS URL. MediaMTX converts the camera RTSP stream. These settings avoided stutter on iOS and some Windows players:

hlsAlwaysRemux: true
hlsVariant: fmp4
hlsSegmentCount: 7
hlsSegmentDuration: 1s
hlsPartDuration: 200ms
hlsSegmentMaxSize: 50M
hlsDirectory: ''
hlsMuxerCloseAfter: 60s
hlsAllowOrigin: '*'

paths:
   growcam:
    source: rtsp://USER:PASSWORD@IP.OF.YOUR.CAM/stream1
    sourceProtocol: tcp
    sourceOnDemand: no

If playback still stutters, lower the camera frame rate. 15 fps is a reasonable start.

A public stream needs a second Cloudflare hostname for MediaMTX HLS, separate from the GrowCast hostname. Point Broadcast's stream URL at that public HLS path, for example https://stream.example.com/growcam/.

The timelapse sidecar uses the camera's RTSP URL directly. That URL is collected in the setup wizard and stored in data/timelapse.env.

7. Usage Guide

Stream setup (RTSP camera + MediaMTX)

GrowCast expects a browser-playable stream URL in the admin dashboard. Since some cameras expose RTSP, use MediaMTX to convert RTSP to HLS:

1. Configure your RTSP camera (RTSP source looks somewhat like this: rtsp://<camera-ip>:554/<path>).
2. Run MediaMTX and create a path that ingests RTSP.
3. Use MediaMTX HLS output URL as the stream URL on Broadcast (/admin/stream), for example:
   • http://<mediamtx-host>:8888/<path>/
4. Save on the Broadcast page.

8. API / Backend Overview

This app uses Next.js route handlers and local filesystem storage.

Data storage

• Primary source: data/current-grow.json
• Read/write logic: lib/db.ts
• If file is missing, default data is generated.

Route handlers

• GET /api/data/current-grow
  • Returns the normalized grow record as JSON
  • Uses Cache-Control: no-store, must-revalidate
• GET /api/snapshots/[filename]
  • Serves image files from extensions/GrowCast-Timelapse/snapshots
• GET /api/timelapse
  • Serves timelapse video from extensions/GrowCast-Timelapse/timelapse/latest_timelapse.mp4
• GET /api/data/live-climate
  • Public latest GGS climate JSON (no credentials)
  • Cache-Control: no-store
• GET /api/data/broadcast
  • { "live": true, "login" } while the homepage Twitch toast may show; otherwise { "live": false }
  • Cache-Control: no-store, must-revalidate
• GET /api/data/live-climate/stream
  • Public SSE; snapshot on change + heartbeat every 15s
  • Reverse proxy must not buffer this path (nginx: location /api/data/live-climate/stream { proxy_buffering off; proxy_http_version 1.1; }, Caddy: flush_interval -1)
• GET /api/mesh/[pluginId]
  • Returns registered plugin settings, for example /api/mesh/growcast.timelapse
  • Requires the mesh token from the environment or data/mesh.token, and a matching Authorization: Bearer <token> (fail-closed when both are unset)
• POST /api/mesh/growcast.ggs/state
  • Sidecar ingest, Bearer GROWCAST_MESH_TOKEN

Auth model

• Username + scrypt password hash from .env.local or from the setup wizard (data/setup/admin.json)
• Default setup:admin and the wizard require a 12-character password; --allow-insecure is local/dev only
• Login verifies the stored scrypt hash (non-empty + max length); it does not re-apply the 12-character setup minimum
• Signed cookie-based sessions (24-hour TTL)
• Optional authenticator (TOTP) and one-time recovery codes in data/setup/totp.json, turned on from Admin → Security. Sign-in stays password-only until that file is confirmed.
• If the phone and the recovery codes are both lost, stop GrowCast and delete data/setup/totp.json. The next sign-in is password-only. Rotating ADMIN_SESSION_SECRET also makes that file unreadable; delete it and turn the authenticator on again.
• In-memory session store (single-node deploy). Recreating the container with docker compose up --build signs you out.

9. Deployment

Cloudflare Tunnel (recommended for public access)

To make the HLS source and app publicly accessible without exposing your home network, publish both services through Cloudflare Tunnel:

1. Run GrowCast (example: http://localhost:3000).
2. Run MediaMTX (example: HLS endpoint on http://localhost:8888).
3. Create tunnel routes with cloudflared:
   • One public hostname for GrowCast (example: growcast.example.com -> http://localhost:3000)
   • One public hostname for MediaMTX HLS (example: stream.example.com -> http://localhost:8888)
4. In GrowCast admin, set Stream URL to your public MediaMTX HLS URL:
   • https://stream.example.com/<path>/
5. Verify both endpoints are reachable through Cloudflare.

Important:

• Keep admin credentials strong (ADMIN_* env vars).

10. Troubleshooting

Admin login is disabled

Cause:

• Missing/invalid ADMIN_* env variables.

Fix:

• Run npm run setup:admin and restart the app.

Gallery shows "unavailable"

Cause:

• extensions/GrowCast-Timelapse folder missing or no media generated.

Fix:

• Install/run the timelapse plugin and ensure snapshots/timelapse files exist.

Changes are not visible immediately

Cause:

• Stale page cache after edits.

Fix:

• Restart dev server.