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smarthome-androidthings

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Home automation with Android Things and the Google Assistant (Actions on Google)

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# Smart Home sample using Android Things, Firebase, and Cloud functions

![](https://raw.githubusercontent.com/Nilhcem/smarthome-androidthings/master/photo.jpg)

Blog post: [http://nilhcem.com/android-things/google-assistant-smart-home](http://nilhcem.com/android-things/google-assistant-smart-home)

## Build

### Firebase

* Create a new project on the [Firebase console](https://console.firebase.google.com) and note the Project ID somewhere (you'll need it soon)
* Add an Android app to this project, with the following package name: `com.nilhcem.smarthome.androidthings`
* Download the `google-services.json` file and save it to the `app` directory
* Create a new Firebase Realtime Database, importing the following json file
```json
{
  "fan" : {
    "on" : false
  },
  "lights" : {
    "on" : true,
    "spectrumRGB" : 16510692
  }
}
```
* Configure database rules to public (**don't** do that on production)
```json
{
  "rules": {
    ".read": true,
    ".write": true
  }
}
```
* Go to Firebase's Project Settings > Service Accounts, and click on the "Generate New Private Key" button. Save the generated file in `servers/smart-home-provider-functions/serviceAccountKey.json`
* Open the `servers/smart-home-provider-functions/index.js` file use your Firebase Project ID to modify the `databaseURL` variable
* Deploy the Android app to your Android Things device. At that time, modifying the database values from the Firebase console should have an effect on the Android Things device.

### Google Cloud Functions

* Enable the Cloud Functions API and install the Google Cloud SDK ([quickstart guide](https://cloud.google.com/functions/docs/quickstart))
* Deploy the `ha` (home automation) function with the following command
```bash
cd servers/smart-home-provider-functions
gcloud beta functions deploy ha --stage-bucket staging.<PROJECT ID>.appspot.com --trigger-http
```
* This script will deploy the function to Google Cloud and give you the endpoint address. Keep the address somewhere, you'll need it (something like `https://us-central1-<PROJECT ID>.cloudfunctions.net/ha`).

Note: if you want to test the functions locally, use the Cloud Functions Emulator
```bash
functions-emulator start
cd servers/smart-home-provider-functions
npm install
functions-emulator deploy ha --trigger-http
functions-emulator stop
```

### OAuth2 server

* A fake OAuth2 mock server is provided so you can test Actions on Google easily. **Do not use this one on production**.  
To build and start it, run the following commands:
```bash
cd servers/fake-oauth-server-nodejs
npm install
npm start
```

* At that time, the server will run on `localhost:3000`. Download [ngrok](http://ngrok.com/) to expose it to the Internet
```bash
ngrok http 3000
```

* The fake OAuth2 server is now exposed to the url. Copy the url (similar to `https://<NGROK_ID>.ngrok.io`). You'll need it later

### Actions on Google
* Update the `servers/action.json` file and specify the Google Cloud Functions endpoint to the `url` variable
* Create an Actions on Google project on the [Actions Console](https://console.actions.google.com/) using the Actions SDK
* When told to update the app via the `gactions` command, run the following to use our `action.json` file
```bash
cd servers
gactions update --action_package action.json --project <PROJECT_ID>
```
* Set up account linking  
  * Grant type: Autorization code  
  * Client ID: `RKkWfsi0Z9`  
  * Client secret: `eToBzeBT7OwrPQO8mZHsZtLp1qhQbe`  
  * Authorization URL: `https://<NGROK_ID>.ngrok.io/oauth`  
  * Token URL: `https://<NGROK_ID>.ngrok.io/token`  
* Save all changes and click on the Test button

## Test

* Start the Google Home app on your phone
* Go to the devices settings > Home control > Add device and select the [test] device
* Login (user: `rick`, password: `oldman`)
* You will now be able to see the fan and the lights devices
* You can now control those devices from the Google assistant

## Kudos to

* [github.com/actions-on-google/actionssdk-smart-home-nodejs](https://github.com/actions-on-google/actionssdk-smart-home-nodejs)
* [Home Automation with the Google Assistant (Google I/O '17) ](https://www.youtube.com/watch?v=NDI0H9F08n8)

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