sender.js

Sender = function(client) {
  return {
    send: function(number, message) {
      client.sendSms(number, message, null, function(){});
    },
    emptyQueueSms: function(number) {
      this.send(number, this.messages.emptyQueue);
    },
    messages: {
      emptyQueue: 'the empty queue message'
    }
  };
};