react-native-eddystone

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react-native-eddystone

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A simple Eddystone™ implementation in React Native for both iOS and Android.

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# react-native-eddystone

A simple Eddystone™ implementation in React Native for both iOS and Android. The library also include an opinionated beacon manager class that enables simple beacon telemetry linking, caching and expiration.

## Installation

`$ npm install @lg2/react-native-eddystone --save`

If your React Native version is below 0.60

`$ react-native link @lg2/react-native-eddystone`

### Manual installation (React Native < 0.60)

#### iOS

1. In XCode, in the project navigator, right click `Libraries` ➜ `Add Files to [your project's name]`
2. Go to `node_modules` ➜ `@lg2` ➜ `react-native-eddystone` and add `Eddystone.xcodeproj`
3. In XCode, in the project navigator, select your project. Add `libEddystone.a` to your project's `Build Phases` ➜ `Link Binary With Libraries`
4. Run your project (`Cmd+R`)

Alternatively, you can use Cocoapods like so:

`pod 'Eddystone', :path => '../node_modules/@lg2/react-native-eddystone/ios'`

#### Android

1. Open up `android/app/src/main/java/[...]/MainApplication.java`

- Add `import com.lg2.eddystone.EddystonePackage;` to the imports at the top of the file
    - Add `new EddystonePackage()` to the list returned by the `getPackages()` method

2. Append the following lines to `android/settings.gradle`:

```
   include ':@lg2_react-native-eddystone'
   project(':@lg2_react-native-eddystone').projectDir = new File(rootProject.projectDir, '../node_modules/@lg2/react-native-eddystone/android')
   ```

3. Insert the following lines inside the dependencies block in `android/app/build.gradle`:
   ```
   implementation project(':@lg2_react-native-eddystone')
   ```

## Usage

This is a very simple example of how to listen to UID broadcastz from Eddystone beacons. For more examples, refer to the `examples` folder.

```javascript
import Eddystone from "@lg2/react-native-eddystone";

// bind a callback when detecting a uid frame
Eddystone.addListener("onUIDFrame", function(beacon) {
  console.log(beacon);
});

// start listening for beacons
Eddystone.startScanning();

// stop listening for beacons
Eddystone.stopScanning();
```

### API

| Method | Arguments | Description |
| -------------- | ----------------------------------------- | ------------------------------------------------------------ |
| startScanning | none | Starts the device's bluetooth manager and looks for Eddystone beacons. |
| stopScanning | none | Stop the device's bluetooth manager from listening for Eddystone beacons. |
| addListener | `event: string` `callback: Function` | Registers a callback function to an event. |
| removeListener | `event: string` `callback: Function` | Unregisters a callback function to an event. |
| Manager | class | A simple beacon telemetry linking, caching and expiration class built on top of the current API. See below. |

### Events

There are many events that can be subscribed to using the library's `addListener` method.

| Name             | Parameters                 | Description                                                  |
| ---------------- | -------------------------- | ------------------------------------------------------------ |
| onUIDFrame       | `beacon: BeaconData`       | The device received information from a beacon broadcasting UID data. |
| onEIDFrame       | `beacon: BeaconData`       | The device received information from a beacon broadcasting EID data. |
| onURLFrame       | `url: URLData`             | The device received a Url broadcasted by a beacon.           |
| onTelemetryFrame | `telemetry: TelemetryData` | The device received telemetry information from a beacon.     |
| onStateChanged   | `state: string`            | The device's bluetooth manager state has changed. (iOS only) |

### Data Structures

#### BeaconData

```js
{
  id: string,
  uid: string,
  rssi: number,
  txPower: number
}
```

#### TelemetryData

```js
{
  uid: string,
  voltage: number,
  temp: number
}
```

#### URLData

```js
{
  uid: string,
  url: string
}
```

## Manager

### API

| Method | Arguments | Description |
| -------------- | -------------------------------------------- | ------------------------------------------------------------ |
| constructor | `expiration: number` | Creates a instance of the manager with a specific `expiration` time for beacons. |
| start | none | Starts the device's bluetooth manager and looks for Eddystone beacons. |
| stop | none | Stop the device's bluetooth manager from listening for Eddystone beacons. |
| has | `uid: string` | Determines whether or not the beacon exists within the manager or not. |
| addBeacon | `data: BeaconData` | Adds a beacon to the manager. This is done automatically when the start method is called but you're allowed to do it manually at any point. |
| addUrl | `beacon: Beacon` `data: URLData` | Updates a beacon to set its URL. This is done automatically when the start method is called but you're allowed to do it manually at any point. |
| addTelemetry | `beacon: Beacon` `data: TelemetryData` | Updates a beacon to set its telemetry data. This is done automatically when the start method is called but you're allowed to do it manually at any point. |
| addListener | `event: string` `callback: Function` | Registers a callback function to an event. |
| removeListener | `event: string` `callback: Function` | Unregisters a callback function to an event. |

### Events

Events that can be subscribed using the manager's `addListener` method.

| Name            | Parameters       | Description                                                  |
| --------------- | ---------------- | ------------------------------------------------------------ |
| onBeaconAdded   | `beacon: Beacon` | The manager received information from a new beacon broadcasting UID or EID data. |
| onBeaconUpdated | `beacon: Beacon` | The manager received information from a beacon broadcasting a URL or Telemetry data. |
| onBeaconExpired | `beacon: Beacon` | The manager has not received information from a beacon within the ammount of millisecond set by the `expiration` value. |

## Beacon

### API

| Method | Arguments | Description |
| ------------- | ------------------------------------------ | ------------------------------------------------------------ |
| constructor | `data: BeaconData` `manager: Manager` | Creates a instance of a beacon from data and manager |
| setExpiration | `time: number` | Sets the beacon expiration. This is done automatically by the manager but you're allowed to do it manually at any point. |
| getDistance | none | Returns the approximative distance in meters from the device. |

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