Example code of read sensor data of multiple SensorTag (CC2541DK-SENSOR, CC2650STK) at same time by using node-sensortag

multiple_sensortag.js

/*
 * Example code of read sensor data of multiple SensorTag (CC2541DK-SENSOR, CC2650STK) at same time by using node-sensortag
 *
 * Node.js 0.10.36 or higher (4.4.2 ready)
 *
 * Usage;
 * $ npm install sensortag async
 * $ node multiple_sensortag.js
 *
 * e.g.)
```
$ node multiple_sensortag.js
start
5cXXXXXXXXXX discovered
5cXXXXXXXXXX ready
{"Info":{"id":"5cXXXXXXXXXX","type":"cc2540","rssi":-48},"Humidity":{"temperature":25.576584472656243,"humidity":58.1937255859375}}
{"Info":{"id":"5cXXXXXXXXXX","type":"cc2540","rssi":-47},"Humidity":{"temperature":25.579265747070316,"humidity":58.36920166015625}}
b0XXXXXXXXXX discovered
{"Info":{"id":"5cXXXXXXXXXX","type":"cc2540","rssi":-47},"Humidity":{"temperature":25.576584472656243,"humidity":58.43023681640625}}
{"Info":{"id":"5cXXXXXXXXXX","type":"cc2540","rssi":-49},"Humidity":{"temperature":25.576584472656243,"humidity":58.43023681640625}}
b0XXXXXXXXXX ready
{"Info":{"id":"5cXXXXXXXXXX","type":"cc2540","rssi":-51},"Humidity":{"temperature":25.579265747070316,"humidity":58.43023681640625}}
{"Info":{"id":"b0XXXXXXXXXX","type":"cc2650","rssi":-48},"Humidity":{"temperature":25.137939453125,"humidity":73.468017578125},"Luxometer":{"lux":32.19}}
{"Info":{"id":"5cXXXXXXXXXX"},"SimpleKey":{"left":true,"right":false}}
{"Info":{"id":"5cXXXXXXXXXX","type":"cc2540","rssi":-63},"Humidity":{"temperature":25.576584472656243,"humidity":58.43023681640625}}
{"Info":{"id":"5cXXXXXXXXXX"},"SimpleKey":{"left":false,"right":false}}
{"Info":{"id":"b0XXXXXXXXXX","type":"cc2650","rssi":-42},"Humidity":{"temperature":25.137939453125,"humidity":73.468017578125},"Luxometer":{"lux":100.44}}
^C
```
 */
var polling_interval = 1000; //ms | NOTE: Interval for polling in periodic

var SensorTag = require('sensortag');
var async = require('async');

var device_timers = {}; // NOTE: Storage for setinterval objects

var onDiscover = function(sensorTag) {
	sensorTag.once('disconnect', function() {
		clearInterval(device_timers[sensorTag.id]);
		delete(device_timers[sensorTag.id]);
		console.info(sensorTag.id, 'disconnected');
	});

	async.series({
		connectAndSetUp: function(next) {
			console.info(sensorTag.id, 'discovered');
			sensorTag.connectAndSetUp(function() {
				SensorTag.discover(onDiscover); // NOTE: resume for discover other devices
				next();
			});
		},
		enableSensors: function(next) {
			sensorTag.enableHumidity();
			sensorTag.notifySimpleKey();
			try {
				sensorTag.enableLuxometer();
			} catch(ex) {
				// NOTE: Ignored because not supported
			}
			console.info(sensorTag.id, 'ready');
			next();
		},
	}, function() {
			// NOTE: In case of polling in periodic
			device_timers[sensorTag.id] = setInterval(function() {
				async.parallel({
					Info: function(next) {
						var info = {id: sensorTag.id, type: sensorTag.type};
						sensorTag._peripheral.updateRssi(function(error, rssi) {
							info.rssi = rssi;
						});
						next(null, info);
					},
					Humidity: function(next) {
						sensorTag.readHumidity(function(error, temperature, humidity) {
							next(null, {temperature: temperature, humidity: humidity});
						});
					},
					Luxometer: function(next) {
						try {
							sensorTag.readLuxometer(function(error, lux) {
								next(null, {lux: lux});
							});
						} catch(ex) {
							next(); // NOTE: Ignored because not supported
						};
					}
				}, function(err, data) {
					console.log(JSON.stringify(data));
				});
			}, polling_interval);
			// NOTE: In case of listening for notification
			sensorTag.on('simpleKeyChange', function(left, right) {
				var data = {Info: {id: sensorTag.id}, SimpleKey: {left: left, right: right}};
				console.log(JSON.stringify(data));
			});
		}
	);
};

console.info('start');
SensorTag.discover(onDiscover);

Description of code is here (in Japanese)