Just a little experiment reading dualshock4 bluetooth inputs with node.js. Uses node-hid.

dualshock4-nodejs-experiement.js

/** 
 * Just for fun, hacking Dualshock4 with node.js
 * Most of the code comes from https://npmjs.org/package/dualshock-controller
 * Just wanted to play with the low level hid protocol. 
 * Next step: EV3 Control via Bluetooth with Dualshock4 (PC still required). 
 * Future step: EV3 node.js onboarding with Dualshock4 remote control (Autonomous).
 */
var HID = require('node-hid');


// just a quick configuration with the hardcoded vendor/product id of the Dualshock4
var controllerConfiguration = {
	"vendorId": 1356,
	"productId": 1476
}

var hidDevice;

// simplest connect method. TODO: error handling and more.
function connect() {
	hidDevice = new HID.HID(controllerConfiguration.vendorId, controllerConfiguration.productId);
	console.log('node dualshock connecting');
}

// simplest deviceRead
function deviceRead() {
	//call device read and process the data.
	try {
		if (hidDevice) {
			hidDevice.read(processFrame);
		} else {
			this.emit("error", "Could not connect to the device");
		}
	} catch (ex) {
		throw ex
		//retry
		deviceRead();
	}

};

// utility to display some number in binary format
function toBin(n, width) {
	width = width || 8;
  var z = '0';
	n = new Number(n).toString(2);
  return n.length >= width ? n : new Array(width - n.length + 1).join(z) + n;
}

// just print out the data and read next input
function processFrame(error, data) {
	//check for errors from node-hid.
	if (error) {
		//throw the error, will be handled and retry will be done.
		throw (error);
	}
	var val, vals = "";
	for (var i = 0; i < data.length; i++) {
		val = data[i];
		if (i == 5 || i == 6) {
			val = toBin(val);
		}
		vals += " " + val;
	}
	console.log("read: " + vals);

	deviceRead();
}

// connect
connect();
// and start the read process
deviceRead();