react-native-multipeer

Communicate over ad hoc wifi using Multipeer Connectivity.

Known Issues

Below is a list of known issues. Pull requests are welcome for any of these issues!

• No support for streams in React Native, so streaming is currently unavailable.
• No support for resource transfers: I want this to work seamlessly with other file resources for other uses, so I'm waiting for those specs to be finalized.

Getting started

1. npm install react-native-multipeer@latest --save
2. In XCode, in the project navigator, right click Libraries ➜ Add Files to [your project's name]
3. Go to node_modules ➜ react-native-multipeer and add RCTMultipeerConnectivity.xcodeproj
4. In XCode, in the project navigator, select your project. Add libRCTMultipeerConnectivity.a to your project's Build Phases ➜ Link Binary With Libraries
5. Click RCTMultipeerConnectivity.xcodeproj in the project navigator and go the Build Settings tab. Make sure 'All' is toggled on (instead of 'Basic'). Look for Header Search Paths and make sure it contains both $(SRCROOT)/../react-native/React and $(SRCROOT)/../../React - mark both as recursive.
6. Run your project (Cmd+R)

Usage

All you need is to require the react-native-multipeer module and then you can start using the singleton instance.

var React = require('react-native');
var {
  AppRegistry,
  ListView,
  StyleSheet,
  Text,
  View,
  TouchableHighlight
} = React;
var MultipeerConnectivity = require('react-native-multipeer');

function getStateFromSources() {
  var ds = new ListView.DataSource({rowHasChanged: (r1, r2) => r1 !== r2});
    return {
      dataSource: ds.cloneWithRows(MultipeerConnectivity.getAllPeers())
    };
}

var peerApp = React.createClass({
  getInitialState: function() {
    return getStateFromSources()
  },
  componentDidMount() {
    MultipeerConnectivity.on('peerFound', this._onChange);
    MultipeerConnectivity.on('peerLost', this._onChange);
    MultipeerConnectivity.on('invite', ((event) => {
      // Automatically accept invitations
      MultipeerConnectivity.rsvp(event.invite.id, true);
    }).bind(this));
    MultipeerConnectivity.on('peerConnected', (event) => {
      alert(event.peer.id + ' connected!');
    });
    MultipeerConnectivity.advertise('channel1', { name: 'User-' + Math.round(1e6 * Math.random()) });
    MultipeerConnectivity.browse('channel1');
  },

  renderRow(peer) {
    return (
      <TouchableHighlight onPress={this.invite.bind(this, peer)} style={styles.row}>
        <View>
          <Text>{peer.name}</Text>
        </View>
      </TouchableHighlight>
    );
  },
  
  render: function() {
    return (
      <View style={styles.container}>
        <ListView
          style={styles.peers}
          dataSource={this.state.dataSource}
          renderRow={this.renderRow}
        />
      </View>
    );
  },
  
  _invite(peer) {
    MultipeerConnectivity.invite(peer.id);
  },
  
  _onChange() {
    this.setState(getStateFromSources());
  }
});


var styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: 'transparent',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
  },
});

AppRegistry.registerComponent('peerApp', () => peerApp);

MultipeerConnectivity methods

Channels

advertise(channelId, info)

Allow discovery of yourself as a peer in a given channel. channelId can be any string. info is an object containing data which will be passed to other peers when you join the channel.

browse(channelId)

Browse for peers on a given channel.

getAllPeers()

Gets all the peers in the current channel.

Sessions

getConnectedPeers()

Gets all the peers in the current session.

disconnect([callback])

Disconnect from the current session.

invite(peerId [, callback])

Invite a peer from your channel into your session.

rsvp(inviteId, accept [, callback])

Accept/decline a session invitation.

Communication

broadcast(data [, callback<err>])

Send data to all connected peers in the current channel.

send(data, recipients [, callback<err>])

Send data to specific peers in the current channel. recipients is an array of peer IDs or Peers.

MultipeerConnectivity Events

MultipeerConnectivity inherits from EventEmitter - as such the .on method is available for listening to important events. Below is a list of those events.

data

Event properties: Peer sender, data

Fired when new data is received from sender.

peerFound

Event properties: peer

A new peer was found in the current channel.

peerLost

Event properties: peer

A peer left the current channel.

peerConnected

Event properties: peer

A peer has connected to your session.

peerConnecting

Event properties: peer

A peer is connecting to your session.

peerDisconnected

Event properties: peer

A peer disconnected from your session.

invite

Event properties: sender, invite

You have been invited to a session.

Peer methods

Events

connected

The peer connected to the current session.

connecting

The peer is connecting to the current session.

disconnected

The peer disconnected from the current session.

lost

The peer left the current channel.

Todo

These are some features I think would be important/beneficial to have included with this module. Pull requests welcome!

• Stream support
• Resource transfers