events_usage.js

// Wait until the messenger is fully
// ready, then send a message
FxoMessenger.on('stateChanged', function(state) {
  if (state === 'connected') {
    FxoMessenger.sendMessage('Hey!');
  }
});

// Subscribe to all messages received,
// logging them to the console
FxoMessenger.on('messageReceived', function(message) {
  console.log(message);
});