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remote_homeassistant

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Links multiple home-assistant instances together

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# Remote Home-Assistant

_Component to link multiple Home-Assistant instances together._

**This component will set up the following platforms.**

Platform | Description
-- | --
`remote_homeassistant` | Link multiple Home-Assistant instances together .

The main instance connects to the Websocket APIs of the remote instances (already enabled out of box), the connection options are specified via the `host`, `port`, and `secure` configuration parameters. If the remote instance requires an access token to connect (created on the Profile page), it can be set via the `access_token` parameter. To ignore SSL warnings in secure mode, set the `verify_ssl` parameter to false.

After the connection is completed, the remote states get populated into the master instance.
The entity ids can optionally be prefixed via the `entity_prefix` parameter.

The entity friendly names can optionally be prefixed via the `entity_friendly_name_prefix` parameter.

The component keeps track which objects originate from which instance. Whenever a service is called on an object, the call gets forwarded to the particular remote instance.

When the connection to the remote instance is lost, all previously published states are removed again from the local state registry.

A possible use case for this is to be able to use different Z-Wave networks, on different Z-Wave sticks (with the second one possible running on another computer in a different location).

## Installation

This component *must* be installed on both the main and remote instance of Home Assistant

If you use HACS:

1. Click install.

Otherwise:

1. To use this plugin, copy the `remote_homeassistant` folder into your [custom_components folder](https://developers.home-assistant.io/docs/creating_integration_file_structure/#where-home-assistant-looks-for-integrations).

**Remote instance**

On the remote instance you also need to add this to `configuration.yaml`:

```yaml
remote_homeassistant:
  instances:
```

This is not needed on the main instance.

## Configuration (main instance)

### Web (Config flow)

1. Add a new Remote Home-Assistant integration

2. Specify the connection details to the remote instance

You can generate an access token in the by logging into your remote instance, clicking on your user profile icon, and then selecting "Create Token" under "Long-Lived Access Tokens".

Check "Secure" if you want to connect via a secure (https/wss) connection

3. After the instance is added, you can configure additional Options by clicking the "Options" button.

4. You can configure an optional prefix that gets prepended to all remote entities (if unsure, leave this blank).

Click "Submit" to proceed to the next step.

5. You can also define filters, that include/exclude specified entities or domains from the remote instance.

---

or via..

### YAML

To integrate `remote_homeassistant` into Home Assistant, add the following section to your `configuration.yaml` file:

Simple example:

```yaml
# Example configuration.yaml entry
remote_homeassistant:
  instances:
  - host: raspberrypi.local
```

Full example:

```yaml
# Example configuration.yaml entry
remote_homeassistant:
  instances:
  - host: localhost
    port: 8124
  - host: localhost
    port: 8125
    secure: true
    verify_ssl: false
    access_token: !secret access_token
    entity_prefix: "instance02_"
    entity_friendly_name_prefix: "Instance02 "
    include:
      domains:
      - sensor
      - switch
      - group
      entities:
      - zwave.controller
      - zwave.desk_light
    exclude:
      domains:
      - persistent_notification
      entities:
      - group.all_switches
    filter:
    - entity_id: sensor.faulty_pc_energy
      above: 100
    - unit_of_measurement: W
      below: 0
      above: 1000
    - entity_id: sensor.faulty_*_power
      unit_of_measurement: W
      below: 500
    subscribe_events:
    - state_changed
    - service_registered
    - zwave.network_ready
    - zwave.node_event
    load_components:
    - zwave
```

```
host:
  host: Hostname or IP address of remote instance.
  required: true
  type: string
port:
  description: Port of remote instance.
  required: false
  type: int
secure:
  description: Use TLS (wss://) to connect to the remote instance.
  required: false
  type: bool
verify_ssl:
  description: Enables / disables verification of the SSL certificate of the remote instance.
  required: false
  type: bool
  default: true
access_token:
  description: Access token of the remote instance, if set.
  required: false
  type: string
max_message_size:
  description: Maximum message size, you can expand size limit in case of an error.
  required: false
  type: int
entity_prefix:
  description: Prefix for all entities of the remote instance.
  required: false
  type: string
entity_friendly_name_prefix:
  description: Prefix for all entity friendly names of the remote instance.
  required: false
  type: string
include:
  description: Configures what should be included from the remote instance. Values set by the exclude lists will take precedence.
  required: false
  default: include everything
  type: mapping of
    entities:
      description: The list of entity ids to be included from the remote instance
      type: list
    domains:
      description: The list of domains to be included from the remote instance
      type: list
exclude:
  description: Configures what should be excluded from the remote instance
  required: false
  default: exclude nothing
  type: mapping of
    entities:
      description: The list of entity ids to be excluded from the remote instance
      type: list
    domains:
      description: The list of domains to be excluded from the remote instance
      type: list
filter:
  description: Filters out states above or below a certain threshold, e.g. outliers reported by faulty sensors
  required: false
  type: list of
    entity_id:
      description: which entities the filter should match, supports wildcards
      required: false
      type: string
    unit_of_measurement
      description: which units of measurement the filter should match
      required: false
      type: string
    above:
      description: states above this threshold will be ignored
      required: false
      type: float
    below:
      description: states below this threshold will be ignored
      required: false
      type: float
subscribe_events:
  description: Further list of events, which should be forwarded from the remote instance. If you override this, you probably will want to add state_changed!!
  required: false
  type: list
  default: 
  - state_changed
  - service_registered
load_components:
  description: Load components of specified domains only present on the remote instance, e.g. to register services that would otherwise not be available.
  required: false
  type: list
service_prefix: garage_
  description: Prefix used for proxy services. Must be unique for all instances.
  required: false
  type: str
  default: remote_
services:
  description: Name of services to set up proxy services for.
  required: false
  type: list
```

## Special notes

### Missing Components

If you have remote domains (e.g. `switch`), that are not loaded on the main instance you need to list them under `load_components`, otherwise you'll get a `Call service failed` error.

E.g. on the master:

```yaml
remote_homeassistant:
  instances:
  - host: 10.0.0.2
    load_components:
    - zwave
```

to enable all `zwave` services. This can also be configured via options under Configuration->Integrations.

### Proxy Services

Some components do not use entities to handle service calls, but handle the
service calls themselves. One such example is `hdmi_cec`. This becomes a
problem as it is not possible to forward the service calls properly. To work
around this limitation, it's possible to set up a *proxy service*.

A proxy service is registered like a new service on the master instance, but
it mirrors a service on the remote instance. When the proxy service is called
on the master, the mirrored service is called on the remote instance. Any
error is propagated back to the master. To distinguish proxy services from
regular services, a service prefix must be provided.

Example: If a proxy service is set up for `hdmi_cec.volume` with service
prefix `remote_`, a new service called `hdmi_cec.remote_volume` will be
registered on the master instance. When called, the actual call will be forwarded
to `hdmi_cec.volume` on the remote instance. The YAML config would
look like this:

```yaml
remote_homeassistant:
  instances:
  - host: 10.0.0.
    service_prefix: remote_
    services:
      - hdmi_cec.volume
```

This can also be set up via Options for the integration under
Configuration -> Integrations.

---

See also the discussion on https://github.com/home-assistant/home-assistant/pull/13876 and https://github.com/home-assistant/architecture/issues/246 for this component

[hacs]: https://github.com/hacs/integration
[hacsbadge]: https://img.shields.io/badge/HACS-Custom-orange.svg?style=for-the-badge
[license-shield]: https://img.shields.io/github/license/lukas-hetzenecker/home-assistant-remote.svg?style=for-the-badge
[maintenance-shield]: https://img.shields.io/badge/maintainer-lukas--hetzenecker-blue.svg?style=for-the-badge

remote_homeassistant

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