zwave-js-ui: drive a Z-Wave controller and serve Home Assistant

Z-Wave JS UI exposes a Z-Wave controller twice: a web control panel on 8091 and
the Z-Wave JS Server websocket on 3000, which is what the Home Assistant
zwave_js integration connects to. MQTT stays off.

The controller is taken as /dev/zwave, a name a udev rule of the site gives it,
so no site value is baked into the cookbook. The container path is spelled out
in AddDevice: a udev SYMLINK is a symbolic link, and a device passed without one
arrives under its resolved name, which is not the name ZWAVE_PORT asks for.

The security keys, the Z-Wave JS Server settings and the log level come from an
operator-provided file through ZWAVE_EXTERNAL_SETTINGS, so Z-Wave JS UI marks
them managed externally and refuses to edit them. The two settings that file
cannot carry -- authEnabled and mqtt.disabled -- are seeded into the store once,
following the home-assistant cookbook pattern.

The health probe sends Accept: text/plain. Without it the single-page-application
fallback answers 200 for any request that accepts HTML, driver or no driver.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

cookbooks/zwave-js-ui/Makefile

@@ -0,0 +1,17 @@
+##
+## Makefile for Z-Wave JS UI quadlet
+##
+
+# Z-Wave JS UI runs as UID 10035 (zwave-js-ui) / GID 10000 (itix-svc) on the host
+PROJECT_UID = 10035
+PROJECT_GID = 10000
+
+# Include common Makefile
+include ../../scripts/common.mk
+
+# The example security keys stand in for the operator-provided ones. Install them
+# with the same 0400 mode and 10035:10000 ownership that the operator must use,
+# overriding the default 0644 config-install rule for this file.
+TARGET_ZWAVE_JS_UI_KEYS_EXAMPLE = $(TARGET_CHROOT)/etc/quadlets/zwave-js-ui/external-settings.json
+$(TARGET_ZWAVE_JS_UI_KEYS_EXAMPLE): $(TARGET_CHROOT)/etc/quadlets/zwave-js-ui/%: config/examples/% $(TARGET_CHROOT)/etc/quadlets/zwave-js-ui
+	install -m 0400 -o $(PROJECT_UID) -g $(PROJECT_GID) $< $@

cookbooks/zwave-js-ui/README.md

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+# Podman Quadlet: Z-Wave JS UI
+
+## Overview
+
+[Z-Wave JS UI](https://zwave-js.github.io/zwave-js-ui/) drives a Z-Wave controller
+plugged into the host and exposes it twice: a web control panel on port 8091, and the
+**Z-Wave JS Server** websocket on port 3000, which is what the Home Assistant `zwave_js`
+integration connects to.
+
+This cookbook:
+
+- Runs Z-Wave JS UI as a non-root container (UID 10035) with the controller as its only
+  device.
+- Takes the controller under the stable name **`/dev/zwave`**, never a
+  `/dev/serial/by-id/...` path: which USB stick is the Z-Wave one is a site value, and it
+  belongs in a udev rule of the site, not in this cookbook.
+- Keeps the **security keys, the Z-Wave JS Server settings and the log level out of the web
+  interface**, in an operator-provided file that the container mounts read-only. Z-Wave JS UI
+  marks those settings "managed externally" and refuses to edit them.
+- Enables **authentication on the web interface from the first boot**, and disables the MQTT
+  gateway: Home Assistant is served by the websocket, not by MQTT.
+- Stores the node names, the associations, the NVM backups of the controller and the users
+  of the web interface on the virtiofs precious-data mount
+  (`/var/lib/virtiofs/data/zwave-js-ui/`), so the host's ZFS snapshots and backups pick
+  them up.
+- Logs to stdout, so `journalctl` is the single place to look.
+- Supports automatic container image updates via Podman auto-update.
+
+The image is `ghcr.io/zwave-js/zwave-js-ui:11`, a multi-architecture manifest (amd64 +
+arm64, verified 2026-09-26, version 11.24.1).
+
+## What this cookbook does NOT do
+
+- **It does not carry the Z-Wave network.** The network lives in the NVM of the controller:
+  its home ID, its node list and its routes are on the stick, not here. Wiping this
+  cookbook's store loses the node names and the associations, not the network.
+- **It does not back the NVM up on its own.** Z-Wave JS UI can dump the controller NVM into
+  its store (`backups/nvm/`) from the web interface or on a schedule set there; nothing in
+  this cookbook turns that on.
+- **It does not publish anything.** No Traefik dependency, no TLS: the two ports are served
+  in clear text on the LAN. A radio head is a LAN appliance; if it must be reachable from
+  outside, that is a reverse proxy in front, and a decision of the site.
+- **It does not include or exclude devices.** Pairing a device is a physical act plus a
+  click in the web interface.
+
+## Prerequisites
+
+- The virtiofs data mount `/var/lib/virtiofs/data` must be present (provided by the
+  `fcos-with-virtiofs` template / the `base` cookbook). On a physical machine with no
+  hypervisor the mount unit's condition simply does not hold, the unit is skipped, and the
+  store is a plain directory of `/var` — which is what a radio head wants anyway, as long as
+  `/var` survives a reinstallation.
+- **A Z-Wave controller reachable as `/dev/zwave`**, whose device node is readable and
+  writable by GID 10000. See below.
+- The operator must provide the security keys and the session secret. Until both files
+  exist, the container is intentionally **not** started (`ConditionPathExists` guards on
+  `/etc/quadlets/zwave-js-ui/external-settings.json` and
+  `/etc/quadlets/zwave-js-ui/zwave-js-ui.env`).
+
+### `/dev/zwave`, and why
+
+`AddDevice=/dev/zwave` in the container, `ZWAVE_PORT=/dev/zwave` in its environment. The
+site provides that name with a udev rule matching *its* controller, for instance:
+
+```
+# /etc/udev/rules.d/99-zwave.rules -- Home Assistant Connect ZWA-2
+SUBSYSTEM=="tty", ATTRS{idVendor}=="303a", ATTRS{idProduct}=="4001", \
+  SYMLINK+="zwave", GROUP="itix-svc", MODE="0660"
+```
+
+Two things that rule has to do, and the reason for each:
+
+- **`SYMLINK+="zwave"`** — the container and its unit name one path, so a second radio stick
+  on the same host (a Zigbee coordinator, say) cannot be handed to the Z-Wave driver by a
+  renumbered `/dev/ttyACM*`. Matching on `ATTRS{serial}` as well is what distinguishes two
+  sticks that share a USB identifier, which is common: the CP210x bridge is the same chip in
+  half the controllers on the market.
+- **`GROUP="itix-svc", MODE="0660"`** — the container runs as 10035:10000 and opens the
+  device as that user. The kernel default is `root:dialout 0660`, which it cannot read.
+  Setting the group on the device node is preferred over adding the host's `dialout` GID to
+  the container, because that GID is a distribution constant that does not match the group
+  file inside the image.
+
+Reload the rules and replug the controller (or `udevadm trigger`) after writing the file,
+then check that the symlink is there:
+
+```sh
+ls -l /dev/zwave
+```
+
+## Files the operator must provide
+
+Both are provided by the operator (e.g. an Ansible overlay out of a vault) and are **not**
+part of the package. Working development examples ship under `config/examples/`.
+
+| Path                                                  | Mode | Owner         | Purpose                                     |
+|-------------------------------------------------------|------|---------------|---------------------------------------------|
+| `/etc/quadlets/zwave-js-ui/external-settings.json`    | 0400 | `10035:10000` | Security keys + Z-Wave JS Server settings   |
+| `/etc/quadlets/zwave-js-ui/zwave-js-ui.env`           | 0600 | `root:root`   | Session secret, initial admin credentials   |
+
+### `external-settings.json`
+
+Z-Wave JS UI reads it through `ZWAVE_EXTERNAL_SETTINGS`. Only `zwave.*` settings are
+accepted there, and every key present becomes read-only in the web interface. The shipped
+example is a complete, working file; the keys in it are obviously not secrets.
+
+**The four classic keys are the identity of the network.** A device included in S0 or S2
+holds a key derived from them: lose them and the device answers nobody, and the only way
+back is to exclude and re-include it by hand. They belong in a vault before the first
+inclusion, not after.
+
+Generate six independent 16-byte keys:
+
+```sh
+for k in S0_Legacy S2_Unauthenticated S2_Authenticated S2_AccessControl \
+         LR_S2_Authenticated LR_S2_AccessControl; do
+  printf '%s = %s\n' "$k" "$(openssl rand -hex 16)"
+done
+```
+
+`securityKeysLongRange` is only used by Z-Wave Long Range devices, and only on an 800-series
+controller in an LR region. Providing the two keys costs nothing and spares a migration the
+day such a device is included.
+
+Settings worth knowing about:
+
+| Key                              | Effect                                                              |
+|----------------------------------|---------------------------------------------------------------------|
+| `serverEnabled`, `serverPort`    | The Z-Wave JS Server websocket Home Assistant connects to           |
+| `serverServiceDiscoveryDisabled` | `false` announces the server over mDNS, so Home Assistant finds it  |
+| `rf.region`                      | **Writes the RF region to the controller.** Absent, the controller keeps its own (0 = Europe, 9 = USA LR, 11 = Europe LR, 255 = default EU) |
+| `enableSoftReset`                | Lets the driver restart the controller in software rather than ask an operator to replug it |
+| `logLevel`, `logEnabled`         | `info` is readable; `debug` is what an inclusion that fails needs    |
+
+`rf.region` is deliberately **absent from the shipped example**: a controller is sold for a
+band, an operator who copies an example must not have its region rewritten by surprise.
+
+### `zwave-js-ui.env`
+
+```
+SESSION_SECRET=<openssl rand -hex 32>
+DEFAULT_USERNAME=admin
+DEFAULT_PASSWORD=<a real password>
+```
+
+`SESSION_SECRET` signs the session cookies and the API tokens. Absent, Z-Wave JS UI
+generates one and persists it in the store — which works, but then the secret is a piece of
+state nobody chose and nobody can restore. `DEFAULT_USERNAME` and `DEFAULT_PASSWORD` create
+the administrator account **on the first start only**: once `store/users.json` exists,
+changing them does nothing and the password is changed from the web interface.
+
+## Ports
+
+| Port | Bind | Purpose                                                          |
+|------|------|------------------------------------------------------------------|
+| 8091 | all  | Web control panel (authenticated)                                |
+| 3000 | all  | Z-Wave JS Server websocket — `ws://<host>:3000` for Home Assistant |
+
+Both are above 1024, so the non-root container binds them without any capability. Host
+networking is what lets the mDNS announcement of the websocket server reach the LAN.
+
+## UID and GID
+
+- User: `zwave-js-ui`, UID **10035**
+- Group: `itix-svc`, GID **10000**
+
+## Health check
+
+`wget -q -O /dev/null --header="Accept: text/plain" http://127.0.0.1:8091/health`. That
+endpoint returns 200 only when the driver is connected to the controller **and** the MQTT
+client is either connected or explicitly disabled — which is why the packaged
+`initial-settings.json` carries `mqtt.disabled`: with no `mqtt` section at all, Z-Wave JS UI
+builds no MQTT client and `/health` answers 500 forever.
+
+**The `Accept` header is load-bearing.** A request that accepts HTML — which includes a
+request with no `Accept` header at all, so `curl` and `wget` as they come — is taken by the
+single-page-application fallback: 301 to `/health/`, then the web interface, 200, whatever
+the driver is doing. A probe written without it passes forever and reports nothing.
+
+A failing probe marks the container unhealthy and nothing more: no restart action is set.
+The driver reconnects on its own, and a controller that has been unplugged is not a problem
+a restart loop fixes.
+
+## Deviations from the repository conventions
+
+- **The store is seeded once, by `zwave-js-ui-init.service`.** Z-Wave JS UI owns
+  `store/settings.json` — everything the web interface changes is written back to it — so the
+  two settings this cookbook decides (`gateway.authEnabled`, `mqtt.disabled`) cannot be
+  shipped as configuration. They are copied into the store on first boot only, following the
+  same pattern as the `home-assistant` cookbook. Z-Wave JS UI merges that file with its own
+  defaults at each start, so seeding a partial file loses nothing.
+- **Two settings files, on purpose.** `external-settings.json` in `/etc/quadlets` is
+  read-only and authoritative for the keys and the websocket server;
+  `store/settings.json` is the application's own, and the operator's copy of it is the seed.
+  Z-Wave JS UI merges the two at each start and **persists the result, security keys included,
+  into `store/settings.json`** (0600, owned by this cookbook's user). So the store holds a copy
+  of the keys whether or not they were seeded there, and a store backup is a secret-bearing
+  artifact. What the external file buys is not secrecy: it is that the authoritative copy lives
+  outside the application, is restorable from a vault, and cannot be edited from the web
+  interface.
+- **No Traefik and no TLS.** See "What this cookbook does NOT do".
+
+## Usage
+
+In a separate terminal, follow the logs.
+
+```sh
+sudo make tail-logs
+```
+
+Install the Podman Quadlets and start Z-Wave JS UI.
+
+```sh
+sudo make clean install
+```
+
+Without a Z-Wave controller there is nothing to drive, and the container unit is skipped
+(`ConditionPathExists=/dev/zwave`). To exercise the rest of the cookbook on a machine that
+has none, point `/dev/zwave` at any serial device — the driver fails to talk to it and says
+so, which is exactly what it should do:
+
+```sh
+ln -sf /dev/ttyS0 /dev/zwave
+sudo systemctl start zwave-js-ui.target
+```
+
+Note that `AddDevice` names the container path explicitly (`/dev/zwave:/dev/zwave`): a udev
+`SYMLINK` is a symbolic link, and a device passed without a container path arrives under its
+resolved name (`/dev/ttyACM0`), which is not the name `ZWAVE_PORT` asks for.
+
+With a real controller, the driver comes up and the two ports answer (note the `Accept`
+header — see [Health check](#health-check)):
+
+```sh
+curl -sS -H 'Accept: text/plain' http://127.0.0.1:8091/health   # -> Ok
+ss -ltnp | grep -E ':(8091|3000)'                               # 8091 AND 3000
+journalctl -u zwave-js-ui.service | grep -E 'Driver ready|server listening'
+```
+
+Finally, remove the quadlets, their configuration and their data.
+
+```sh
+sudo make I_KNOW_WHAT_I_AM_DOING=yes uninstall clean
+```

cookbooks/zwave-js-ui/config/examples/external-settings.json

@@ -0,0 +1,19 @@
+{
+  "securityKeys": {
+    "S0_Legacy": "01010101010101010101010101010101",
+    "S2_Unauthenticated": "02020202020202020202020202020202",
+    "S2_Authenticated": "03030303030303030303030303030303",
+    "S2_AccessControl": "04040404040404040404040404040404"
+  },
+  "securityKeysLongRange": {
+    "S2_Authenticated": "05050505050505050505050505050505",
+    "S2_AccessControl": "06060606060606060606060606060606"
+  },
+  "serverEnabled": true,
+  "serverPort": 3000,
+  "serverServiceDiscoveryDisabled": false,
+  "enableSoftReset": true,
+  "logEnabled": true,
+  "logLevel": "info",
+  "logToFile": false
+}

cookbooks/zwave-js-ui/config/examples/zwave-js-ui.env

@@ -0,0 +1,13 @@
+# Development credentials and session secret for Z-Wave JS UI.
+#
+# NOT FOR PRODUCTION: an operator provides this file with its own values, out of
+# a vault. See the README.
+#
+# SESSION_SECRET signs the session cookies and the API tokens. Provided here so
+# that sessions survive a store that is wiped between two iterations; absent, one
+# is generated and persisted in the store.
+SESSION_SECRET=development-session-secret-not-for-production
+# Credentials of the administrator account, created on the FIRST start only (once
+# store/users.json exists, changing these values does nothing).
+DEFAULT_USERNAME=admin
+DEFAULT_PASSWORD=zwave

cookbooks/zwave-js-ui/config/init.sh

@@ -0,0 +1,34 @@
+#!/bin/sh
+#
+# Seed the Z-Wave JS UI store on first boot.
+#
+# Z-Wave JS UI owns store/settings.json: every change made in the web interface
+# is written back to it. So this script only ever creates it when it is absent,
+# and never touches it again. What it seeds are the two settings the cookbook
+# decides and that the external settings file cannot carry (Z-Wave JS UI only
+# accepts `zwave.*` keys there):
+#
+#   - gateway.authEnabled, so the web interface asks for a password from the
+#     very first boot rather than after an operator remembers to turn it on;
+#   - mqtt.disabled, because a Z-Wave JS UI with no MQTT section at all builds no
+#     MQTT client, and /health then reports 500 forever (the probe asks for both
+#     halves of the gateway, and an absent client is indistinguishable from a
+#     broken one).
+#
+# The keys of settings.json are merged with Z-Wave JS UI's own defaults at each
+# start, so seeding a partial file loses nothing.
+#
+set -eu
+
+SRC=/etc/quadlets/zwave-js-ui/initial-settings.json
+DST=/var/lib/virtiofs/data/zwave-js-ui/settings.json
+ZUI_UID=10035
+ZUI_GID=10000
+
+if [ -e "$DST" ]; then
+    echo "Keeping existing $DST (Z-Wave JS UI owns it)"
+    exit 0
+fi
+
+echo "Seeding $DST from $SRC"
+install -m 0600 -o "$ZUI_UID" -g "$ZUI_GID" "$SRC" "$DST"

cookbooks/zwave-js-ui/config/initial-settings.json

@@ -0,0 +1,8 @@
+{
+  "gateway": {
+    "authEnabled": true
+  },
+  "mqtt": {
+    "disabled": true
+  }
+}

cookbooks/zwave-js-ui/overlay.bu

@@ -0,0 +1,9 @@
+variant: fcos
+version: 1.4.0
+passwd:
+  users:
+  - name: zwave-js-ui
+    uid: 10035
+    gecos: Z-Wave JS UI
+    home_dir: /var/lib/quadlets/zwave-js-ui
+    primary_group: itix-svc

cookbooks/zwave-js-ui/tmpfiles.d/zwave-js-ui.conf

@@ -0,0 +1,4 @@
+# Precious data: the Z-Wave JS UI store (node names, associations, NVM backups,
+# web interface users). The "$" marks it for removal on
+# `systemd-tmpfiles --purge` (i.e. `make uninstall`).
+d$ /var/lib/virtiofs/data/zwave-js-ui 0700 10035 10000 -

cookbooks/zwave-js-ui/zwave-js-ui-init.service

@@ -0,0 +1,24 @@
+[Unit]
+Description=Z-Wave JS UI - Bootstrap the store from the packaged initial settings
+Documentation=https://zwave-js.github.io/zwave-js-ui/guide/#configuration
+After=var-lib-virtiofs-data.mount
+Requires=var-lib-virtiofs-data.mount
+
+# Only run if the initial settings are there to be copied
+ConditionPathExists=/etc/quadlets/zwave-js-ui/initial-settings.json
+
+# Start/stop this unit when the target is started/stopped, before the service
+PartOf=zwave-js-ui.target
+Before=zwave-js-ui.service
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+
+# Seed the store's settings.json on first boot only (see init.sh). Z-Wave JS UI
+# owns that file afterwards: every change made in the web interface is written
+# back to it, so it is never overwritten once it exists.
+ExecStart=/etc/quadlets/zwave-js-ui/init.sh
+
+[Install]
+WantedBy=zwave-js-ui.target

cookbooks/zwave-js-ui/zwave-js-ui.container

@@ -0,0 +1,97 @@
+[Unit]
+Description=Z-Wave JS UI - Z-Wave control panel and Z-Wave JS Server
+Documentation=https://zwave-js.github.io/zwave-js-ui/
+After=network.target var-lib-virtiofs-data.mount zwave-js-ui-init.service
+Requires=var-lib-virtiofs-data.mount zwave-js-ui-init.service
+
+# The Z-Wave controller, under the stable name a udev rule gives it. Without it
+# there is nothing to talk to: the driver would retry forever and every entity
+# of the household would sit unavailable, which is noise, not a service.
+ConditionPathExists=/dev/zwave
+
+# The security keys and the session secret are operator-provided: they are the
+# identity of the Z-Wave network, not a setting. Starting without them would
+# form a network whose keys nobody kept, and re-pairing every device by hand is
+# the only way back from that.
+ConditionPathExists=/etc/quadlets/zwave-js-ui/external-settings.json
+ConditionPathExists=/etc/quadlets/zwave-js-ui/zwave-js-ui.env
+
+# Start/stop this unit when the target is started/stopped
+PartOf=zwave-js-ui.target
+
+[Container]
+ContainerName=zwave-js-ui
+Image=zwave-js-ui.image
+AutoUpdate=registry
+
+# No need for root privileges: the image has no entrypoint script, it execs node
+# straight away, and node binds 8091 and 3000 (both > 1024) as this user. It
+# writes nothing outside STORE_DIR.
+User=10035
+Group=10000
+
+# Network configuration (host networking is the convention across this repository)
+Network=host
+
+# The Z-Wave controller. /dev/zwave is a stable name a udev rule of the site
+# gives to its controller, and the device node it points at has to be writable
+# by GID 10000 -- see the README. Naming the device here rather than a
+# /dev/serial/by-id/... path is what keeps this cookbook free of site values.
+#
+# The container path is spelled out, and it has to be: a udev SYMLINK is a
+# symbolic link, and `--device /dev/zwave` alone hands the container the node
+# under its RESOLVED name (/dev/ttyACM0), which is not the name ZWAVE_PORT
+# below asks for. The symptom is a driver that never opens its port:
+# "Failed to open the serial port: No such file or directory (ZW0100)".
+AddDevice=/dev/zwave:/dev/zwave
+
+# Everything the driver needs comes from the environment, so the settings this
+# operator decided stay out of reach of the web interface (Z-Wave JS UI marks
+# them "managed externally" and refuses to edit them):
+#   - ZWAVE_PORT forces the serial port AND enables the driver;
+#   - ZWAVE_EXTERNAL_SETTINGS holds the security keys and the Z-Wave JS Server
+#     settings Home Assistant connects to;
+#   - STORE_DIR moves the store off the image and onto the precious-data mount.
+Environment=ZWAVE_PORT=/dev/zwave
+Environment=ZWAVE_EXTERNAL_SETTINGS=/etc/quadlets/zwave-js-ui/external-settings.json
+Environment=STORE_DIR=/var/lib/virtiofs/data/zwave-js-ui
+
+# SESSION_SECRET and the initial administrator credentials (site secrets).
+EnvironmentFile=/etc/quadlets/zwave-js-ui/zwave-js-ui.env
+
+# Configuration (read-only), at the same path inside and outside the container so
+# that ZWAVE_EXTERNAL_SETTINGS names one path only.
+Volume=/etc/quadlets/zwave-js-ui:/etc/quadlets/zwave-js-ui:ro,Z
+
+# Precious data: the store holds the node names, the associations, the NVM
+# backups of the controller and the users of the web interface. It lives on the
+# virtiofs mount so the host's ZFS snapshots and backups pick it up.
+Volume=/var/lib/virtiofs/data/zwave-js-ui:/var/lib/virtiofs/data/zwave-js-ui:z
+
+# Health check: /health is 200 only once the driver is connected to the
+# controller AND the MQTT gateway is either connected or explicitly disabled
+# (which is what the packaged initial-settings.json does). A radio head whose
+# driver is down serves nothing, so that is the right thing to probe. The image
+# has no curl; busybox wget exits non-zero on 500, which is all that is needed.
+#
+# The Accept header is what makes the probe a probe. A request that accepts HTML
+# -- which includes one with no Accept header at all -- is taken by the
+# single-page-application fallback and answered with a 301 to /health/ and then
+# the web interface itself, 200, driver or no driver. The probe would pass
+# forever. Asking for text/plain is what reaches the endpoint.
+HealthCmd=wget -q -O /dev/null --header="Accept: text/plain" http://127.0.0.1:8091/health
+HealthInterval=30s
+HealthTimeout=10s
+# First start downloads the device configuration database into the store, which
+# takes a minute or so before the driver even opens the port.
+HealthStartPeriod=180s
+HealthRetries=5
+
+[Service]
+Restart=always
+RestartSec=10
+TimeoutStartSec=300
+TimeoutStopSec=60
+
+[Install]
+WantedBy=zwave-js-ui.target

cookbooks/zwave-js-ui/zwave-js-ui.image

@@ -0,0 +1,12 @@
+[Unit]
+Description=podman pull ghcr.io/zwave-js/zwave-js-ui
+Documentation=https://zwave-js.github.io/zwave-js-ui/
+
+[Image]
+# Multi-architecture manifest (amd64 + arm64, verified 2026-09-26 on tag 11 ->
+# 11.24.1), so the cookbook installs on an aarch64 host as well as on the x86_64
+# radio head. The tag is the major version: Z-Wave JS UI ships the zwave-js
+# driver and its Z-Wave JS Server, whose schema version is what Home Assistant
+# negotiates. A major bump is the one that can break that handshake, so it is
+# the one an operator has to opt into.
+Image=ghcr.io/zwave-js/zwave-js-ui:11

cookbooks/zwave-js-ui/zwave-js-ui.target

@@ -0,0 +1,11 @@
+[Unit]
+Description=Z-Wave JS UI Service Target
+Documentation=man:systemd.target(5)
+Requires=zwave-js-ui-init.service zwave-js-ui.service
+After=zwave-js-ui-init.service zwave-js-ui.service
+
+# Allow isolation - can stop/start this target independently
+AllowIsolate=yes
+
+[Install]
+WantedBy=multi-user.target