Get only selected data from navdata

[ibekmezci]

As I scanned the code, node-ar-drone can select a subset of navdata. In thşs way, the volume of the navdata can be smaller. However, I could not find any example about it. Can you provide an example about navdata selection. For example, what can we write if we want only gps and wind data?

[wiseman]

You use something like this to select which pieces of navdata you want:

var arDrone = require('ar-drone'); 
var arDroneConstants = require('ar-drone/lib/constants');

function navdataOptionMask(c) {
  return 1 << c;
}

var navdataOptions = (
    navdataOptionMask(arDroneConstants.options.DEMO)
  | navdataOptionMask(arDroneConstants.options.VISION_DETECT)
  | navdataOptionMask(arDroneConstants.options.MAGNETO)
  | navdataOptionMask(arDroneConstants.options.WIFI)
);

// Connect and configure the drone
var client = new arDrone.createClient();
client.config('general:navdata_demo', true);
client.config('general:navdata_options', navdataOptions);

The set of navdata options is defined at https://github.com/felixge/node-ar-drone/blob/6b08477a43667724b5b5c3bac7c15b7f013ec27f/lib/constants.js#L72

You might want WIND_SPEED and ZIMMU_3000 (which we think is GPS but see issue #75).