node-red-nodes/hardware/physical-web/physical-web.js

/**
 * Copyright 2015 IBM Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/

module.exports = function(RED) {
	"use strict";

	var eddystoneBeacon = require('eddystone-beacon');
	var EddystoneBeaconScanner = require('eddystone-beacon-scanner');

	function Beacon(n){
		RED.nodes.createNode(this,n);
		var node = this;
		node.power = n.power;
		node.period = n.period;
		node.url = n.url;

		node.options = {
			txPowerLevel: node.power,
			tlmPeriod: node.period
		}


		if (node.url) {
			try {
				eddystoneBeacon.advertiseUrl(msg.payload, node.options);
			} catch(e){
				node.error('Error setting beacon URL', e);
			}
		}

		node.on('input', function(msg){
			try {
				eddystoneBeacon.advertiseUrl(msg.payload, node.options);
			} catch(e){
				node.error('error updating beacon URL', e);
			}
		});

		node.on('close', function(done){
			try {
				eddystoneBeacon.stop();
				done();
			} catch(e){
				node.error('error shuttingdown beacon', e);
			}
		});

	}
	RED.nodes.registerType("PhysicalWeb out", Beacon);

	function Scanner(n){
		RED.nodes.createNode(this,n);
		var node = this;
		node.topic = n.topic;

		function onFound(beacon) {
			node.send({
				topic: node.topic,
				payload: beacon
			});
		}

		EddystoneBeaconScanner.on('found', onFound);
		EddystoneBeaconScanner.on('updated', onFound);

		node.on('close',function(done){
			EddystoneBeaconScanner.removeListener('found', onFound);
			EddystoneBeaconScanner.removeListener('updated', onFound);
			done();
		});
	}
	RED.nodes.registerType("PhysicalWeb in", Scanner);

};