Wemo lights example - "npm install wemo-js xml2js" then "node wemo-light.js" for instructions

wemo-light.js

var wemo = require('wemo-js');
var http = require('http');
var util = require('util');
var xml2js = require('xml2js');

var postbodyheader = [
  '<?xml version="1.0" encoding="utf-8"?>',
  '<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">',
    '<s:Body>'].join('\n');


var postbodyfooter = ['</s:Body>',
  '</s:Envelope>'
].join('\n');

var getenddevs = {};
getenddevs.path = '/upnp/control/bridge1';
getenddevs.action = '"urn:Belkin:service:bridge:1#GetEndDevices"';
getenddevs.body = [
  postbodyheader, 
  '<u:GetEndDevices xmlns:u="urn:Belkin:service:bridge:1">', 
  '<DevUDN>%s</DevUDN>', 
  '<ReqListType>PAIRED_LIST</ReqListType>',
  '</u:GetEndDevices>',
  postbodyfooter
].join('\n');


if (process.argv.length < 3) {
	console.log("Help:");
	console.log("node wemo-lights.js list - Shows all the available bulbs");
	console.log("node wemo-lights.js state <friendly name> - Shows the current state of a given bulb");
	console.log("node wemo-lights.js control <friendly name> on|off [0-255] - (dim value only used if state is on)");
	console.log("node wemo-lights.js dim <friendly name> <0-255> - setting dim value of an off device will turn it on at new level");
	console.log("node wemo-lights.js sleep <friendly name> <time> - time in seconds to dim to off");
	process.exit(0);
}

function processOptions(lights) {
	if (process.argv[2] === 'list') {
		console.log("Lights:");
		console.log("Friendly name - id");
		for (var j=0; j<lights.length; j++) {
			console.log("%s - %s", lights[j].name, lights[j].id);
		}
		console.log("-------");
		console.log("Sockets:");
		for (var j=0; j<sockets.length; j++) {
			console.log("%s", sockets[j].name);
		}
		process.exit(0);
	} else if (process.argv[2] === 'state') {
		for (var j=0; j<lights.length; j++) {
			if (lights[j].name === process.argv[3]) {
				console.log("%s %s",lights[j].name, lights[j].state);
				process.exit(0);
			}
			if (sockets[j].name === process.argv[3]) {
				console.log("%s %s",sockets[j].name, sockets[j].state);
				process.exit(0);
			}
		}
	} else if (process.argv[2] === 'control') {
		for (var j=0; j<lights.length; j++) {
			if (lights[j].name === process.argv[3]) {
				var on = 0;
				var level = 255;
				if ("on" === process.argv[4]) {
					on = 1;
				}
				control(lights[j], on);
				if (on === 1 && process.argv.length === 6) {
					console.log("dimming to %d", process.argv[5]);
					dim(lights[j], process.argv[5]);
				}
				return;
			}
		}
		for (var j=0; j<sockets.length; j++) {
			if (sockets[j].name === process.argv[3]) {
				var on = 0;
				if ("on" === process.argv[4]) {
					on = 1;
				}
				toggleSocket(sockets[j], on);
				return;
			}
		}
	} else if (process.argv[2] === "dim") {
		for (var j=0; j<lights.length; j++) {
			if (lights[j].name === process.argv[3]) {
				var level = process.argv[4];
				dim(lights[j],level);
				break;
			}
		}
	} else if (process.argv[2] === "sleep") {
		for (var j=0; j<lights.length; j++) {
			var time = process.argv[4];
			sleep(lights[j], time);
		}
	}
}

function toggleSocket(socket, on) {
	var postoptions = {
    		host: socket.ip,
    		port: socket.port,
    		path: "/upnp/control/basicevent1",
    		method: 'POST',
    		headers: {
    			'SOAPACTION': '"urn:Belkin:service:basicevent:1#SetBinaryState"',
    			'Content-Type': 'text/xml; charset="utf-8"',
    			'Accept': ''
    		}
    	};

    	var post_request = http.request(postoptions, function(res) {
    		var data = "";
    		res.setEncoding('utf8');
    		res.on('data', function(chunk){
    			data += chunk
    		});

    		res.on('end', function(){
    			//console.log(data);
    		});
    	});

		var body = [
			postbodyheader,
			'<u:SetBinaryState xmlns:u="urn:Belkin:service:basicevent:1">',
			'<BinaryState>%s</BinaryState>',
			'</u:SetBinaryState>',
			postbodyfooter
		].join('\n');

		post_request.write(util.format(body, on));
		post_request.end();
}

function control(light, on) {
	setStatus(light, "10006", on);
}

function dim(light, dim) {
	setStatus(light, "10008", dim + ":0");
}

function sleep(light, time) {
	var date = new Date();
	date = date.getTime()/1000;
	time = time * 10;
	setStatus(light, "30008", time + ":" + date);
}


function setStatus(light, capability, value) {
	var setdevstatus = {};
	setdevstatus.path = '/upnp/control/bridge1';
	setdevstatus.action = '"urn:Belkin:service:bridge:1#SetDeviceStatus"';
	setdevstatus.body = [
	  postbodyheader,
	  '<u:SetDeviceStatus xmlns:u="urn:Belkin:service:bridge:1">',
	  '<DeviceStatusList>',
	  '&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;&lt;DeviceStatus&gt;&lt;IsGroupAction&gt;NO&lt;/IsGroupAction&gt;&lt;DeviceID available=&quot;YES&quot;&gt;%s&lt;/DeviceID&gt;&lt;CapabilityID&gt;%s&lt;/CapabilityID&gt;&lt;CapabilityValue&gt;%s&lt;/CapabilityValue&gt;&lt;/DeviceStatus&gt;',
	  '</DeviceStatusList>',
	  '</u:SetDeviceStatus>',
	  postbodyfooter
	].join('\n');

	var postoptions = {
		host: light.ip,
		port: light.port,
		path: setdevstatus.path,
		method: 'POST',
		headers: {
			'SOAPACTION': setdevstatus.action,
		 	'Content-Type': 'text/xml; charset="utf-8"',
			'Accept': ''
		}
	};

	var post_request = http.request(postoptions, function(res) {
		var data = "";
		res.setEncoding('utf8');
		res.on('data', function(chunk) {
			data += chunk;
		});

		res.on('end', function(){
			//console.log(data);
		});
	});

	post_request.on('error', function (e) {
		console.log(e);
		console.log("%j", postoptions);
	});

	//console.log(util.format(setdevstatus.body, light.id, capability, value));

	post_request.write(util.format(setdevstatus.body, light.id, capability, value));
	post_request.end();
}

var lights = [];
var sockets = [];

var timer; 

var client = wemo.Search();
client.on('found', function(device) {
    //console.log("%j",device);

    if (!timer) {
    	timer = setTimeout(function() {
        	client.stop();
        	processOptions(lights);
    	}, 2000);
    }

    if (device.deviceType === "urn:Belkin:device:bridge:1") {

    	var ip = device.ip;
    	var port = device.port;
    	var udn = device.UDN;



    	var postoptions = {
			host: ip,
			port: port,
			path: getenddevs.path,
			method: 'POST',
			headers: {
		 		'SOAPACTION': getenddevs.action,
		 		'Content-Type': 'text/xml; charset="utf-8"',
				'Accept': ''
			}
		};

		var post_request = http.request(postoptions, function(res) {
		  var data = "";
		  res.setEncoding('utf8');
		  res.on('data', function(chunk) {
		  	data += chunk;
		  });

		  res.on('end', function(){
			xml2js.parseString(data, function(err, result) {
				if (!err) {
					var list = result["s:Envelope"]["s:Body"][0]["u:GetEndDevicesResponse"][0].DeviceLists[0];
					xml2js.parseString(list, function(err, result2) {
						if (!err) {
							var devinfo = result2.DeviceLists.DeviceList[0].DeviceInfos[0].DeviceInfo
							for (var i=0; i<devinfo.length; i++) {
								//console.log("%s[%s]:\t\t%s",devinfo[i].FriendlyName[0], devinfo[i].DeviceID[0], devinfo[i].CurrentState[0]);
								var light = {
									"ip": ip,
									"port": port,
									"udn": udn,
									"name": devinfo[i].FriendlyName[0],
									"id": devinfo[i].DeviceID[0],
									"state": devinfo[i].CurrentState[0] 
								};
								lights.push(light);
							}
						} else {
							console.log(err);
							console.log(data);
						}
					});
				}
			});
		  });
		});

		post_request.write(util.format(getenddevs.body, udn));
		post_request.end();


    } else if (device.deviceType === 'urn:Belkin:device:controllee:1') {
    	//console.log("%s", device.friendlyName);

    	var socket = {
    		"ip": device.ip,
    		"port": device.port,
    		"name": device.friendlyName,
    		"type": "socket"
    	};

    	var postoptions = {
    		host: socket.ip,
    		port: socket.port,
    		path: "/upnp/control/basicevent1",
    		method: 'POST',
    		headers: {
    			'SOAPACTION': '"urn:Belkin:service:basicevent:1#GetBinaryState"',
    			'Content-Type': 'text/xml; charset="utf-8"',
    			'Accept': ''
    		}
    	};

    	var post_request = http.request(postoptions, function(res) {
    		var data = "";
    		res.setEncoding('utf8');
    		res.on('data', function(chunk){
    			data += chunk
    		});

    		res.on('end', function(){
    			xml2js.parseString(data, function(err, result) {
    				if (!err) {
    					var state = result['s:Envelope']['s:Body'][0]['u:GetBinaryStateResponse'][0].BinaryState[0];
    					socket.state = state;
    					sockets.push(socket);
    				} else {
    					console.log(err);
    					console.log(data);
    				}
    			})
    		});
    	});

		var body = [
			postbodyheader,
			'<u:GetBinaryState xmlns:u="urn:Belkin:service:basicevent:1">',
			'</u:GetBinaryState>',
			postbodyfooter
		].join('\n');

		post_request.write(body);
		post_request.end();
    }
    
});

Ahh, The difference is you have all your bulbs in a group. I've not done much with groups yet. I'm working on a new WEMO node, that should support lights and event notifications (state change updates). When I get some time to look at groups I'll update this.

amadtawakol I have updated the script to support controlling groups (no dimming yet, but should be easy to add) it's here: https://gist.github.com/hardillb/ffa9b458109fb8af7d0f

Hi

Is it normal that it takes about 3-4 seconds for sending a command ?

Thank you