Homex

This library aims to bring Elixir (and especially Nerves) closer to Home Assistant. This is a work in progress based on the initial idea.

Warning

Homex is being refactored towards a multi-adapter and multi-device architecture. The public API and Home Assistant compatibility will change: entity unique_ids change once (existing entities in Home Assistant will be re-created). Pin your version to 0.1.2 if you depend on the current behavior.

Example

There is a Livebook example example.livemd to get you started! There is also an example repository using Nerves at https://github.com/kevinschweikert/Homex-Nerves-Example

Installation

If available in Hex, the package can be installed by adding homex to your list of dependencies in mix.exs:

def deps do
  [
    {:homex, "~> 0.1.2"},
    # for the MQTT adapter
    {:emqtt, "~> 1.14.7"},
    # for the ESPHome adapter
    {:espex, "~> 0.9"},
    # to advertise the ESPHome adapter with `mdns: :mdns_lite`
    {:mdns_lite, "~> 0.8"},
    # to advertise the ESPHome adapter with `mdns: :system`
    {:muontrap, "~> 2.0"},
    # for the Livebook dashboard
    {:kino, "~> 0.19"}
  ]
end

Homex pulls in none of these on its own. Add the ones for the adapters you use.

To build emqtt without QUIC support, and skip the quicer NIF compilation:

{:emqtt,
 github: "emqx/emqtt",
 tag: "1.14.7",
 override: true,
 system_env: [{"BUILD_WITHOUT_QUIC", "1"}]}

Usage

Supported entity types:

• Sensor
• Switch
• Light
• Camera
• Button
• DeviceTrigger
• Text
• Number
• Select

Define a module for the type of entity you want to use

defmodule MySwitch do
  use Homex.Entity.Switch, id: :my_switch, name: "My Switch"

  def handle_on(entity) do
    IO.puts("Switch turned on")
    entity
  end

  def handle_off(entity) do
    IO.puts("Switch turned off")
    entity
  end
end

Add homex to your supervision tree with your adapters and entities. See the Homex.Config module docs for the available options, Homex.Adapter.MQTT for the broker settings and Homex.Adapter.ESPHome for the native API. Entities can also be added/removed at runtime with Homex.add_entity/1 or Homex.remove_entity/1.

Home Assistant finds an ESPHome adapter over mDNS. Give it mdns: :system on a desktop, a server or in a Livebook, and mdns: :mdns_lite on Nerves. Without it you add the device to Home Assistant by its address.

defmodule MyApp.Application do

  def start(_type, _args) do
    children =
      [
        ...,
        {Homex,
         id: Homex.hostname(),
         adapters: [
           {Homex.Adapter.MQTT,
            broker: [host: "localhost", port: 1883, username: "admin", password: "admin"]},
           {Homex.Adapter.ESPHome, mdns: :system}
         ],
         entities: [MySwitch]},
        ...
      ]

    opts = [strategy: :one_for_one, name: MyApp.Supervisor]
    Supervisor.start_link(children, opts)
  end
end

Contribution

PRs and Feedback are very welcome!

Acknowledgements and Inspiration

• ex_homeassistant by @Reimerei
• hap by @mtrudel