talking between Leap.js and Unity Web

leapToUnity.js

(function (window) {
    var controller = window.controller = new Leap.Controller();
    console.log('controller made', controller);
    controller.on('error', function (err) {
        console.log('leap error: ', err);
    })
    controller.on('connect', function () {
        console.log('connection made');
    });
    var errr = false;
    var startTime = new Date().getTime();
    var incTime = startTime;
    var sps = 0;
    controller.on('deviceFrame', function (frame) {
        if (unity_working || errr) return;
        if (frame.valid) {
            var out = {hands: []}

            for (var h = 0; h < frame.hands.length; ++h) {

                var hand = frame.hands[h];

                if (hand.valid) {
                    var out_hand = []; // an array of fingers.

                    for (var f = 0; f < hand.fingers.length; ++f) {
                        var finger = hand.fingers[f];
                        if (finger.valid) {
                            var stp = finger.tipPosition; // or stabilizedTipPosition?
                            out_hand.push(stp);
                        }
                    }
                    if (out_hand.length) {

                        out.hands.push(out_hand);
                    }
                }
            }
            if (!out.hands.length) return;

            try {
                var ib = frame.interactionBox;

                out.width = ib.width;
                out.height = ib.height;
                out.depth = ib.depth;
                var send = new Date();
             //   console.log('sending at ', send.getTime() - start, 'ms');
                ++sps;
                if (send.getTime() > (incTime + 1000)){
                    console.log(sps, 'sends per second');
                    incTime = send.getTime();
                    sps = 0;
                }

                SaySomethingToUnity(JSON.stringify(out));
            } catch (e) {
                console.log('error:', out, e);
                errr = e;
            }
        }
    });
    controller.connect();
})(window);