// install Hipmob using "npm install hipmob", then set the required environment variables
		      if(!('hipmob_username' in process.env)){
		      console.log("Please provide the username as an environment variable.");
		      return;
		      }
		      if(!('hipmob_apikey' in process.env)){
		      console.log("Please provide the API key as an environment variable.");
		      return;
		      }
		      if(!('hipmob_app' in process.env)){
		      console.log("Please provide the application mobile key as an environment variable.");
		      return;
		      }

		      var hipmob = require("hipmob");
		      var handle = hipmob(process.env.hipmob_username, process.env.hipmob_password);

		      // this just quickly retrieves a handle to a device without checking if it exists
		      var dev = handle.get_device(process.env.hipmob_app, '123', false);

		      // this will verify: if a device does not exist, you'll get a [Error: Device not found]
		      // if it exists, you'll get the string representation of the device
		      handle.get_device(process.env.hipmob_app, '123', true, function(err, dev){ 
		      if(!err){
		      console.log(dev); 
		      }else{
		      console.log(err); 
		      }
		      });
		    

		      // install Hipmob using "npm install hipmob", then set the required environment variables
		      if(!('hipmob_username' in process.env)){
		      console.log("Please provide the username as an environment variable.");
		      return;
		      }
		      if(!('hipmob_apikey' in process.env)){
		      console.log("Please provide the API key as an environment variable.");
		      return;
		      }
		      if(!('hipmob_app' in process.env)){
		      console.log("Please provide the application mobile key as an environment variable.");
		      return;
		      }

		      // update this variable to be the host application identifier you're interested in
		      var deviceid = "{specific device id}";

		      var hipmob = require("hipmob");
		      var handle = hipmob(process.env.hipmob_username, process.env.hipmob_password);
		      var dev = handle.get_device(process.env.hipmob_app, deviceid, false);
		      dev.check_device_status(function(err, status){
		      if(!err){ console.log("Device Online? "+status); }else{ console.log(err); }
		      });
		    

		      // install Hipmob using "npm install hipmob", then set the required environment variables
		      if(!('hipmob_username' in process.env)){
		      console.log("Please provide the username as an environment variable.");
		      return;
		      }
		      if(!('hipmob_apikey' in process.env)){
		      console.log("Please provide the API key as an environment variable.");
		      return;
		      }
		      if(!('hipmob_app' in process.env)){
		      console.log("Please provide the application mobile key as an environment variable.");
		      return;
		      }

		      // update this variable to be the host application identifier you're interested in
		      var deviceid = "{specific device id}";

		      var hipmob = require("hipmob");
		      var handle = hipmob(process.env.hipmob_username, process.env.hipmob_password);
		      var dev = handle.get_device(process.env.hipmob_app, deviceid, false);
		      dev.load(function(err, devres){
		      if(!err){ console.log(devres+": ["+devres.created()+"]"); }else{ console.log(err); }
		      });
		    

		      // install Hipmob using "npm install hipmob", then set the required environment variables
		      if(!('hipmob_username' in process.env)){
		      console.log("Please provide the username as an environment variable.");
		      return;
		      }
		      if(!('hipmob_apikey' in process.env)){
		      console.log("Please provide the API key as an environment variable.");
		      return;
		      }
		      if(!('hipmob_app' in process.env)){
		      console.log("Please provide the application mobile key as an environment variable.");
		      return;
		      }

		      // update this variable to be the host application identifier you're interested in
		      var deviceid = "{specific device id}";

		      var hipmob = require("hipmob");
		      var handle = hipmob(process.env.hipmob_username, process.env.hipmob_password);
		      var dev = handle.get_device(process.env.hipmob_app, deviceid, false);
		      dev.available_message_count(function(err, count){
		      if(!err){ console.log("Available messages: "+count); }else{ console.log(err); }
		      });
		    

		      // install Hipmob using "npm install hipmob", then set the required environment variables
		      if(!('hipmob_username' in process.env)){
		      console.log("Please provide the username as an environment variable.");
		      return;
		      }
		      if(!('hipmob_apikey' in process.env)){
		      console.log("Please provide the API key as an environment variable.");
		      return;
		      }
		      if(!('hipmob_app' in process.env)){
		      console.log("Please provide the application mobile key as an environment variable.");
		      return;
		      }

		      // update this variable to be the host application identifier you're interested in
		      var deviceid = "{specific device id}";

		      var hipmob = require("hipmob");
		      var handle = hipmob(process.env.hipmob_username, process.env.hipmob_password);
		      var dev = handle.get_device(process.env.hipmob_app, deviceid, false);

		      // will not call back: do this if you don't care if the call succeeds or not
		      dev.send_text_message("Message 1.");

		      // do this to receive a notification when the call completes
		      dev.send_text_message("Message 2.", function(err){
		      if(!err){ console.log("Message sent."); }else{ console.log(err); }
		      });
		    

		      // install Hipmob using "npm install hipmob", then set the required environment variables
		      if(!('hipmob_username' in process.env)){
		      console.log("Please provide the username as an environment variable.");
		      return;
		      }
		      if(!('hipmob_apikey' in process.env)){
		      console.log("Please provide the API key as an environment variable.");
		      return;
		      }
		      if(!('hipmob_app' in process.env)){
		      console.log("Please provide the application mobile key as an environment variable.");
		      return;
		      }

		      // update this variable to be the host application identifier you're interested in
		      var deviceid = "{specific device id}";

		      var hipmob = require("hipmob");
		      var handle = hipmob(process.env.hipmob_username, process.env.hipmob_password);
		      var dev = handle.get_device(process.env.hipmob_app, deviceid, false);

		      // set this to the name of the file to send
		      var image = "/home/me/funnypicture.png";

		      // you can pass it either a file or a Buffer: it can not be a stream because we must know 
		      // the Content-Length to successfully send the file.
		      dev.send_picture_message(image, "image/png", function(err){
		      if(!err){ console.log("Message sent."); }else{ console.log(err); }
		      });
		    

		      // install Hipmob using "npm install hipmob", then set the required environment variables
		      if(!('hipmob_username' in process.env)){
		      console.log("Please provide the username as an environment variable.");
		      return;
		      }
		      if(!('hipmob_apikey' in process.env)){
		      console.log("Please provide the API key as an environment variable.");
		      return;
		      }
		      if(!('hipmob_app' in process.env)){
		      console.log("Please provide the application mobile key as an environment variable.");
		      return;
		      }

		      // update this variable to be the host application identifier you're interested in
		      var deviceid = "{specific device id}";

		      var hipmob = require("hipmob");
		      var handle = hipmob(process.env.hipmob_username, process.env.hipmob_password);
		      var dev = handle.get_device(process.env.hipmob_app, deviceid, false);

		      // set this to the name of the file to send
		      var voicemail = "/home/me/voicemail.mp3";

		      // you can pass it either a file or a Buffer: it can not be a stream because we must know 
		      // the Content-Length to successfully send the file.
		      dev.send_audio_message(voicemail, "audio/mp3", function(err){
		      if(!err){ console.log("Message sent."); }else{ console.log(err); }
		      });
		    

		      // install Hipmob using "npm install hipmob", then set the required environment variables
		      if(!('hipmob_username' in process.env)){
		      console.log("Please provide the username as an environment variable.");
		      return;
		      }
		      if(!('hipmob_apikey' in process.env)){
		      console.log("Please provide the API key as an environment variable.");
		      return;
		      }
		      if(!('hipmob_app' in process.env)){
		      console.log("Please provide the application mobile key as an environment variable.");
		      return;
		      }

		      // update this variable to be the host application identifier you're interested in
		      var deviceid = "{specific device id}";

		      var hipmob = require("hipmob");
		      var handle = hipmob(process.env.hipmob_username, process.env.hipmob_password);
		      var dev = handle.get_device(process.env.hipmob_app, deviceid, false);

		      // will not call back: do this if you don't care if the call succeeds or not
		      dev.send_text_message({ "property1": 1, "property2": "value 2", "property3": [1, 2, 3] });

		      // do this to receive a notification when the call completes
		      dev.send_text_message({ "property1": 1, "property2": "value 2", "property3": [1, 2, 3] }, function(err){
		      if(!err){ console.log("Message sent."); }else{ console.log(err); }
		      });
		    

		      // install Hipmob using "npm install hipmob", then set the required environment variables
		      if(!('hipmob_username' in process.env)){
		      console.log("Please provide the username as an environment variable.");
		      return;
		      }
		      if(!('hipmob_apikey' in process.env)){
		      console.log("Please provide the API key as an environment variable.");
		      return;
		      }
		      if(!('hipmob_app' in process.env)){
		      console.log("Please provide the application mobile key as an environment variable.");
		      return;
		      }

		      // update this variable to be the host application identifier you're interested in
		      var deviceid = "{specific device id}";

		      var hipmob = require("hipmob");
		      var handle = hipmob(process.env.hipmob_username, 
		                          process.env.hipmob_password);
		      var dev = handle.get_device(process.env.hipmob_app, deviceid, false);

		      // you can pass it a Buffer: it can be a stream
		      var fs = require('fs');
		      fs.readFile("{message file}", function(err, data){
		        if(!err){
		          dev.send_binary_message(data, function(err){
		            if(!err){ 
		              console.log("Message sent."); 
		            }else{
		              console.log(err);
		            }
		          });
		        }
		      });

		      // install Hipmob using "npm install hipmob", then set the required environment variables
		      if(!('hipmob_username' in process.env)){
		      console.log("Please provide the username as an environment variable.");
		      return;
		      }
		      if(!('hipmob_apikey' in process.env)){
		      console.log("Please provide the API key as an environment variable.");
		      return;
		      }
		      if(!('hipmob_app' in process.env)){
		      console.log("Please provide the application mobile key as an environment variable.");
		      return;
		      }

		      // update this variable to be the host application identifier you're interested in
		      var deviceid = "{specific device id}";

		      var hipmob = require("hipmob");
		      var handle = hipmob(process.env.hipmob_username, process.env.hipmob_password);
		      var dev = handle.get_device(process.env.hipmob_app, deviceid, false);

		      // get the friend list
		      dev.list_friends(function(err, friends){
		      if(!err){
		      if(friends && 'length' in friends){
		      var i, len = friends.length;
		      console.log(len + " friends were found.");
		      for(i=0;i<len;i++){
		      console.log((i+1)+": "+friends[i]);
		      }
		      friendlist = friends;
		      }else{
		      console.log(dev+" has no friends :-(.");
		      }
		      }else{
		      console.log(err);
		      }
		      });
		    

		      // install Hipmob using "npm install hipmob", then set the required environment variables
		      if(!('hipmob_username' in process.env)){
		      console.log("Please provide the username as an environment variable.");
		      return;
		      }
		      if(!('hipmob_apikey' in process.env)){
		      console.log("Please provide the API key as an environment variable.");
		      return;
		      }
		      if(!('hipmob_app' in process.env)){
		      console.log("Please provide the application mobile key as an environment variable.");
		      return;
		      }

		      // update this variable to be the host application identifier you're interested in
		      var deviceid = "{specific device id}";

		      var hipmob = require("hipmob");
		      var handle = hipmob(process.env.hipmob_username, process.env.hipmob_password);
		      var app = process.env.hipmob_app;
		      var dev = handle.get_device(app, deviceid, false);

		      // add a single friend
		      var friend = handle.get_device(app, "4322A04D-D292-4b76-8158-781F77FCE7DB", false);
		      dev.add_friend(friend, function(err, count){
		      if(err) console.log(err)
		      else if(count > 0) console.log(friend + " added.");
		      else console.log("No changes made (friend must already be in friend list).");
		      });

		      // you can also add multiple friends: this will still only require a single network roundtrip
		      var friend1 = handle.get_device(app, "89A84E7A-1F2B-4d80-8F4F-C4A9DDBB486D", false);
		      var friend2 = handle.get_device(app, "8D5F7113-78C8-45c8-8BF4-95DC95759017", false);
		      dev.add_friends([friend1, friend2], function(err, count){
		      if(err) console.log(err)
		      else console.log("Added " + count + " friends.");
		      });
		    

		      // install Hipmob using "npm install hipmob", then set the required environment variables
		      if(!('hipmob_username' in process.env)){
		      console.log("Please provide the username as an environment variable.");
		      return;
		      }
		      if(!('hipmob_apikey' in process.env)){
		      console.log("Please provide the API key as an environment variable.");
		      return;
		      }
		      if(!('hipmob_app' in process.env)){
		      console.log("Please provide the application mobile key as an environment variable.");
		      return;
		      }

		      // update this variable to be the host application identifier you're interested in
		      var deviceid = "{specific device id}";

		      var hipmob = require("hipmob");
		      var handle = hipmob(process.env.hipmob_username, process.env.hipmob_password);
		      var app = process.env.hipmob_app;
		      var dev = handle.get_device(app, deviceid, false);

		      // this will remove a single friend
		      var friend = handle.get_device(app, "8D5F7113-78C8-45c8-8BF4-95DC95759017", false);
		      dev.remove_friend(friend, function(err, count){
		      if(err) console.log(err)
		      else if(count == 1) console.log("Removed "+friend);
		      else console.log("No changes made.");
		      });

		      // and for convenience, you can pass an array
		      // the library will handle the repeated calls (note that there will be one API call for
		      // each friend removed, so for bulk changes it may make more sense to call remove_all_friends
		      // and then follow that wil a call to set_friends
		      var friend1 = handle.get_device(app, "89A84E7A-1F2B-4d80-8F4F-C4A9DDBB486D", false);
		      var friend2 = handle.get_device(app, "4322A04D-D292-4b76-8158-781F77FCE7DB", false);
		      dev.remove_friends([friend1, friend2], function(err, count){
		      if(err) console.log(err)
		      else console.log("Removed "+count+" friends.");
		      });
		    

		      // install Hipmob using "npm install hipmob", then set the required environment variables
		      if(!('hipmob_username' in process.env)){
		      console.log("Please provide the username as an environment variable.");
		      return;
		      }
		      if(!('hipmob_apikey' in process.env)){
		      console.log("Please provide the API key as an environment variable.");
		      return;
		      }
		      if(!('hipmob_app' in process.env)){
		      console.log("Please provide the application mobile key as an environment variable.");
		      return;
		      }

		      // update this variable to be the host application identifier you're interested in
		      var deviceid = "{specific device id}";

		      var hipmob = require("hipmob");
		      var handle = hipmob(process.env.hipmob_username, process.env.hipmob_password);
		      var dev = handle.get_device(process.env.hipmob_app, deviceid, false);

		      // remove all the device's friends
		      dev.remove_all_friends(function(err, count){
		      if(err) console.log(err)
		      else console.log("Removed "+count+" friends.");
		      });
		    

		      // install Hipmob using "npm install hipmob", then set the required environment variables
		      if(!('hipmob_username' in process.env)){
		      console.log("Please provide the username as an environment variable.");
		      return;
		      }
		      if(!('hipmob_apikey' in process.env)){
		      console.log("Please provide the API key as an environment variable.");
		      return;
		      }
		      if(!('hipmob_app' in process.env)){
		      console.log("Please provide the application mobile key as an environment variable.");
		      return;
		      }

		      // update this variable to be the host application identifier you're interested in
		      var deviceid = "{specific device id}";

		      var hipmob = require("hipmob");
		      var handle = hipmob(process.env.hipmob_username, process.env.hipmob_password);
		      var app = process.env.hipmob_app;
		      var dev = handle.get_device(app, deviceid, false);

		      // create a list of friends, and set it with a single call
		      var friendlist = [];
		      friendlist.push(handle.get_device(app, "5813cd68-402f-4836-8f9e-acf1aaaf937d", false));
		      friendlist.push(handle.get_device(app, "9177CBAF-81C0-4b73-9C2F-F04481D32F98", false));
		      friendlist.push(handle.get_device(app, "23275FF9-8511-42a3-A981-F438BEBDB5AB", false));
		      friendlist.push(handle.get_device(app, "97E27C77-C050-4990-A915-100AEBE856B4d", false));
		      dev.set_friends(friendlist, function(err, count){
		      if(err) console.log(err)
		      else console.log("Set " + count + " friends.");
		      });
		    

		      // install Hipmob using 'npm install hipmob', then set the required environment variables
		      if(!('hipmob_username' in process.env)){
		      console.log("Please provide the username as an environment variable.");
		      return;
		      }
		      if(!('hipmob_apikey' in process.env)){
		      console.log("Please provide the API key as an environment variable.");
		      return;
		      }
		      var hipmob = require("hipmob");
		      var handle = hipmob(process.env.hipmob_username, process.env.hipmob_password);
		      var callback = function(err, user){ console.log('--->['+user+']'); };
		      handle.get_user(process.env.hipmob_username, callback);
		    

		      // install Hipmob using "npm install hipmob", then set the required environment variables
		      if(!('hipmob_username' in process.env)){
		      console.log("Please provide the username as an environment variable.");
		      return;
		      }
		      if(!('hipmob_apikey' in process.env)){
		      console.log("Please provide the API key as an environment variable.");
		      return;
		      }
		      var hipmob = require("hipmob");
		      var handle = hipmob(process.env.hipmob_username, process.env.hipmob_password);
		      var callback = function(err, user){ if(user) user.set_status('online'); };
		      handle.get_user(process.env.hipmob_username, callback);