react-native-tcp/examples/rctsockets/index.js

'use strict';

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

global.Buffer = global.Buffer || require('buffer').Buffer;

var net = require('net');

function randomPort() {
  return Math.random() * 60536 | 0 + 5000 // 60536-65536
}

var a = net.createConnection({ port: randomPort() }, function(err) {
  if (err) throw err

  console.log('connected');
});

a.on('error', function(err) {
  console.log(err);
});

var b = net.createConnection({ port: randomPort() }, function(err) {
  if (err) throw err

  console.log('connected');
});

b.on('error', function(err) {
  console.log(err);
});


// a.on('message', function(data, rinfo) {
//   var str = String.fromCharCode.apply(null, new Uint8Array(data));
//   console.log('a received', str, rinfo)
//   a.close()
//   b.close()
// })
// 
// b.on('message', function(data, rinfo) {
//   var str = String.fromCharCode.apply(null, new Uint8Array(data));
//   console.log('b received', str, rinfo)
// 
//   // echo back
//   b.send(data, 0, data.length, aPort, '127.0.0.1', function(err) {
//     if (err) throw err
// 
//     console.log('sent')
//   })
// })
// 
// b.once('listening', function() {
//   var msg = toByteArray('hello')
//   a.send(msg, 0, msg.length, bPort, '127.0.0.1', function(err) {
//     if (err) throw err
// 
//     console.log('sent')
//   })
// })

var rctsockets = React.createClass({
  render: function() {
    return (
      <View style={styles.container}>
        <Text style={styles.welcome}>
          Open Dev Tools to see socket chatter
        </Text>
      </View>
    );
  }
});

var styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5,
  },
});

// // only works for 8-bit chars
// function toByteArray(obj) {
//   var uint = new Uint8Array(obj.length);
//   for (var i = 0, l = obj.length; i < l; i++){
//     uint[i] = obj.charCodeAt(i);
//   }
//
//   return new Uint8Array(uint);
// }

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