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node-red-nodes/hardware/hue_discover/103-hue_discover.js

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/**
* philips_hue.js
* Basic functionality for accessing a Philips Hue wireless Lamp
* Allows for bridge/gateway detection and light scanning.
* Requires node-hue-api https://github.com/peter-murray/node-hue-api
* Copyright 2013 Charalampos Doukas - @BuildingIoT
*
* 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.
**/
//Require node-hue-api
var hue = require("node-hue-api");
var HueApi = require("node-hue-api").HueApi;
// Require main module
var RED = require(process.env.NODE_RED_HOME+"/red/red");
//store the IP address of the Hue Gateway
var gw_ipaddress = "";
var username;
// The main node definition - most things happen in here
function HueNodeDiscovery(n) {
// Create a RED node
RED.nodes.createNode(this,n);
var node = this;
//get username from user input
this.username = n.username;
// Store local copies of the node configuration (as defined in the .html)
this.topic = n.topic;
this.on("input", function(msg){
//start with detecting the IP address of the Hue gateway in the local network:
hue.locateBridges(function(err, result) {
var msg = {};
if (err) throw err;
//check for found bridges
if(result[0]!=null) {
//save the IP address of the 1st bridge found
this.gw_ipaddress = result[0].ipaddress;
msg.payload = this.gw_ipaddress;
//get light info:
var api = new HueApi(this.gw_ipaddress, node.username);
api.lights(function(err, lights) {
var msg2 = {};
if (err) throw err;
var lights_discovered = JSON.stringify(lights, null, 2);
msg2.topic = "Lights";
msg2.payload = lights_discovered;
node.send([msg, msg2]);
});
}
else {
//bridge not found:
var msg = {};
msg.payload = "Bridge not found!";
node.send(msg);
}
});
});
this.on("close", function() {
// Called when the node is shutdown - eg on redeploy.
// Allows ports to be closed, connections dropped etc.
// eg: this.client.disconnect();
});
}
//hue debugging on the output:
var displayResult = function(result) {
console.log(result);
};
var displayError = function(err) {
console.error(err);
};
// Register the node by name. This must be called before overriding any of the
// Node functions.
RED.nodes.registerType("Discover",HueNodeDiscovery);