in device.js

```javascript
exports.proxy = function(command, cb) {
  // was thinking we should use a queue for commands instead of writing to a file
  logger.info('Pushing command to appium work queue: ' + JSON.stringify(command));

  this.push([command, cb]);   // <-------------- ["au.alertIsPresent()", cb ]

  if (typeof command === "object") {
    command = JSON.stringify(command);
  }
};
```