Polar H7 in Node

heart.js

var noble = require('noble');

var uuid = 'FIXME';
var charuuid = '2a37';
var srvuuid = '180d';
var fmt = 1;

noble.on('discover', function(p) {
	if (uuid != p.uuid) return;
	console.log('ja');
	p.connect(function(err) {
		console.log('connected');
		p.discoverServices([srvuuid], function(err, ss) {
			if (ss.length != 1) return;
			console.log('service found');
			ss[0].discoverCharacteristics([charuuid], function(err, cs) {
				if (cs.length != 1) return;
				console.log('characteristic found');
				cs[0].notify(true);
				cs[0].on('read', function(val, isNotification) {
					var rate = val.readUInt8(1);
					var n = (val.length - 2) / 2;
					var rr = [];
					for (var i = 0; i < n; i++) {
						rr.push((val.readUInt16LE(2 + 2 * i) / 1024.0) * 1000.0);
					}
					console.log(rate, rr);
				});
			});
		});
	});
});

noble.on('stateChange', function(state) {
	if (state == 'poweredOn') {
		noble.startScanning();
	}
});