# node-appletv

> A node module for interacting with an Apple TV (4th-generation or later) over the Media Remote Protocol.

## Overview

`node-appletv` is a `node.js` implementation of the Media Remote Protocol which shipped with the 4th-generation Apple TV. This is the protocol that the Apple TV remote app uses, so this should enable the creation of an Apple TV remote app for various platforms. It can also be used in a `homebridge` plugin to connect Apple TV events to HomeKit and vice versa. `node-appletv` can be used as a standalone command line application, or as a module in your own node app. Keep reading for installation and usage instructions.

## Documentation

Developer documentation for `node-appletv` can be found here.

## Usage

### As a standalone cli

    # Install
    $ npm install -g node-appletv

    # Display built-in help
    $ appletv --help

The `appletv` cli supports several commands, such as:

`pair`: Scans for Apple TVs on the local network and initiates the pairing process

`command <command>`: Execute a command on an Apple TV (play, pause, menu, etc.)

`state`: Logs state changes from an Apple TV (now playing info)

`queue`: Requests the current playback queue from an Apple TV

`messages`: Logs all raw messages from an Apple TV

`help <command>`: Get help for a specific command

### As a node module

    $ npm install --save node-appletv

`node-appletv` makes heavy use of Promises. All functions, except for the observe functions, return Promises.

### Examples

#### Scan for Apple TVs and pair

    import { scan } from 'node-appletv';

    let devices = await scan();
    // devices is an array of AppleTV objects
    let device = devices[0];
    await device.openConnection();
    let callback = await device.pair();
    // the pin is provided onscreen from the Apple TV
    await callback(pin);
    // you're paired!
    let credentials = device.credentials.toString();
    console.log(credentials);

#### Connect to a paired Apple TV

    import { scan, parseCredentials, NowPlayingInfo } from 'node-appletv';

    // see example above for how to get the credentials string
    let credentials = parseCredentials(credentialsString);

    let devices = await scan(uniqueIdentifier)[]
    let device = devices[0];
    await device.openConnection(credentials);
    // you're connected!
    // press menu
    await device.sendKeyCommand(AppleTV.Key.Menu);
    console.log("Sent a menu command!");

    // monitor now playing info
    device.on('nowPlaying', (info: NowPlayingInfo) => {
        console.log(info.toString());
    });

The `uniqueIdentifier` is advertised by each Apple TV via Bonjour. Use an app like Bonjour Browser to find it. The identifier is also the first value in the string value of the `Credentials` object.

See homebridge-theater-mode for a more practical use of this module.

## TODO

- Add wake command
- Save credentials for paired Apple TVs

## Development

`node-appletv` is written in Typescript. Edit files in the `src` directory and then run `npm link` to clean, build, and create the symlinks to use the library and cli.

## Acknowledgments

`node-appletv` would not have been possible without the work of these people:

- Jean Regisser who reversed the protobuf spec of the MediaRemoteTV protocol
- Pierre Ståhl who implemented the protocol in Python
- Khaos Tian for reversing the HomeKit protocol which also uses SRP encryption
- Zach Bean for implementing the HAP client spec

## Meta

You can find me on Twitter @evandcoleman

Distributed under the MIT license. See `LICENSE` for more information.

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