diff --git a/dist/really.0.0.1.min.js b/dist/really.0.0.1.min.js
index cfc45f0..8163508 100644
--- a/dist/really.0.0.1.min.js
+++ b/dist/really.0.0.1.min.js
@@ -2,9 +2,9 @@
  *  Really.js v0.0.1
  *  Copyright (C) 2014-2015 Really Inc. <http://really.io>
  *
- *  Date:  Tue Jan 06 2015 17:38:48
+ *  Date:  Sun Jan 18 2015 17:08:07
  */
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console&&null!==console&&null!=(n=console.log)&&n.apply(console,t),t},t.prototype.warn=function(){var t,n;return t=1<=arguments.length?o.call(arguments,0):[],t.unshift("Really::Warn::"),"undefined"!=typeof console&&null!==console&&null!=(n=console.warn)&&n.apply(console,t),t},t.prototype.error=function(){var t,n,e,i,u,a;return t=1<=arguments.length?o.call(arguments,0):[],u="Really::Error::",r.isObject(t[0])&&(n=t[0].code,i=t[0].message,e=t[0].errorName,u=""+u+e+"::"+n+":: "+i,t.shift()),t.unshift(u),"undefined"!=typeof console&&null!==console&&null!=(a=console.error)&&a.apply(console,t),t},t}(),n.exports=e},{lodash:3}],10:[function(t,n){var e,r,o,i,u=[].indexOf||function(t){for(var n=0,e=this.length;e>n;n++)if(n in this&&this[n]===t)return 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o=h,setTimeout(function(){return e.reject(o)},0),e.promise}return this.channel.send(c,{success:l,error:f,complete:s})},t.prototype.onCreate=function(t,n){return this.on(""+t+":created",function(t){return n(t)})},t}(),n.exports=o},{"./protocol":10,"./really-error":13,"component-emitter":2,lodash:3,q:4}],13:[function(t,n){var e,r={}.hasOwnProperty,o=function(t,n){function e(){this.constructor=t}for(var o in n)r.call(n,o)&&(t[o]=n[o]);return e.prototype=n.prototype,t.prototype=new e,t.__super__=n.prototype,t};e=function(t){function n(t){this.message=null!=t?t:"Unknown Error","function"==typeof Error.captureStackTrace&&Error.captureStackTrace(this,n),this.name="ReallyError"}return o(n,t),n}(Error),n.exports=e},{}],14:[function(t,n){var e,r,o,i,u,a;u=t("./protocol"),o=t("./really-error"),e=t("component-emitter"),a=t("lodash"),r=t("q"),i=function(){function t(t){this.channel=t,e(this)}return t.prototype.get=function(t,n){var e,i,c,s,f,l,p;if(!a.isString(t))throw new o("Can not be initialized 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this.on(""+t+":updated",function(t){return n(t)})},t.prototype.onDelete=function(t,n){return this.on(""+t+":deleted",function(t){return n(t)})},t}(),n.exports=i},{"./protocol":10,"./really-error":13,"component-emitter":2,lodash:3,q:4}],15:[function(t,n){var e,r,o,i,u,a,c,s;a=t("./transports/webSocket"),u=t("./really-object"),o=t("./really-collection"),i=t("./really-error"),s=t("lodash"),e=t("./push-handler"),c={},r=function(){function t(t,n,r){if(!t||!n)throw new i("Can't initialize Really without passing domain and access token");if(!s.isString(t)||!s.isString(n))throw new i("Only <String> values are allowed for domain and access token");return c[t]?(this.object=c[t].object,this.collection=c[t].collection,this.transport=c[t].transport):(c[t]={},this.transport=new a(t,n,r),this.transport.connect(),c[t].transport=this.transport,this.object=c[t].object=new u(this.transport),this.collection=c[t].collection=new o(this.transport),this.transport.on("message",function(t){return function(n){return s.has(n,"tag")?void 0:e.handle(t,n)}}(this))),this}return t}(),n.exports=r},{"./push-handler":11,"./really-collection":12,"./really-error":13,"./really-object":14,"./transports/webSocket":17,lodash:3}],16:[function(t,n){var e;e=function(){function t(t){this.url=t}return t.prototype.connect=function(){return void 0},t.prototype.disconnect=function(){return void 0},t.prototype.send=function(){return void 0},t.prototype.isConnected=function(){return void 0},t.prototype.on=function(){return void 0},t}(),n.exports=e},{}],17:[function(t,n){var e,r,o,i,u,a,c,s,f,l,p,h,d,v={}.hasOwnProperty,y=function(t,n){function e(){this.constructor=t}for(var r in n)v.call(n,r)&&(t[r]=n[r]);return e.prototype=n.prototype,t.prototype=new e,t.__super__=n.prototype,t};d=t("lodash"),s=t("../transport"),c=t("../really-error"),f=t("ws"),h=t("../protocol"),r=t("component-emitter"),e=t("../callbacks-buffer"),u=t("../push-handler"),a=t("q"),o=t("../heartbeat"),i=t("../logger"),p=new i,l=function(t){function n(t,n,r){var o;this.domain=t,this.accessToken=n,this.options=null!=r?r:{},this.socket=null,this.callbacksBuffer=new e,this._messagesBuffer=[],this.pushHandler=u,this.initialized=!1,this.url=""+t+"/v"+h.clientVersion+"/socket",o={reconnectionMaxTimeout:3e4,heartbeatTimeout:2e3,heartbeatInterval:5e3,reconnect:!0,onDisconnect:"buffer"},this.options=d.defaults(this.options,o)}var i,s,l;return y(n,t),r(n.prototype),i=function(t){return this.socket.addEventListener("open",function(n){return function(){return n.attempts=0,t.resolve(),l.call(n),n.emit("opened")}}(this)),this.socket.addEventListener("close",function(t){return function(){return t.options.reconnect?(t.emit("reconnecting"),t.reconnect(t.options.reconnectionMaxTimeout)):(t.emit("closed"),t.disconnect())}}(this)),this.socket.addEventListener("error",function(t){return function(){return t.emit("error")}}(this)),this.socket.addEventListener("message",function(t){return function(n){var e;return e=JSON.parse(n.data),d.has(e,"tag")&&t.callbacksBuffer.handle(e),t.emit("message",e)}}(this))},n.prototype.send=function(t,n,e){var r,o,i,u,s,f;return null==n&&(n={}),null==e&&(e=a.defer()),this.isConnected()?(i=t.kind,s=function(t){return"function"==typeof n.success&&n.success(t),e.resolve(t)},o=function(t){return"function"==typeof n.error&&n.error(t),e.reject(t)},r=function(t){return"function"==typeof n.complete?n.complete(t):void 0},t.data.tag=this.callbacksBuffer.add({kind:i,success:s,error:o,complete:r}),this.socket.send(JSON.stringify(t.data)),e.promise):(u=d.isFunction(this.options.onDisconnect)?"custom":this.options.onDisconnect,f=function(r){return function(o){var i,u,a,s,f;null==o&&(o="fail"),s=function(){return e.reject(new c("Connection to the server is not established"))},i=function(){return r._messagesBuffer.push({message:t,options:n,deferred:e})},u=function(){var t;try{return r.options.onDisconnect(r,r._messagesBuffer,c)}catch(n){throw t=n,new c("error invoking custom 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n,e,r,o,i,u,a,c;for(u=t._messagesBuffer,c=[],o=0,i=u.length;i>o;o++)a=u[o],e=a.message,r=a.options,n=a.deferred,c.push(t.send(e,r,n));return c}}(this),0)},n.prototype.isConnected=function(){return this.socket?this.socket.readyState===this.socket.OPEN:!1},n.prototype.isConnecting=function(){return this.socket?this.socket.readyState===this.socket.CONNECTING:!1},s=function(){return this.off()},n.prototype.disconnect=function(){var t;return s.call(this),null!=(t=this.socket)&&t.close(),this.socket=null,this.initialized=!1},n}(s),n.exports=l},{"../callbacks-buffer":7,"../heartbeat":8,"../logger":9,"../protocol":10,"../push-handler":11,"../really-error":13,"../transport":16,"component-emitter":2,lodash:3,q:4,ws:5}]},{},[15])(15)});
\ No newline at end of file
diff --git a/dist/really.js b/dist/really.js
index 956b6ee..7ef9428 100644
--- a/dist/really.js
+++ b/dist/really.js
@@ -2,7 +2,7 @@
  *  Really.js v0.0.1
  *  Copyright (C) 2014-2015 Really Inc. <http://really.io>
  *
- *  Date:  Tue Jan 06 2015 17:38:48
+ *  Date:  Sun Jan 18 2015 17:08:07
  */
 !function(e){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=e();else if("function"==typeof define&&define.amd)define([],e);else{var f;"undefined"!=typeof window?f=window:"undefined"!=typeof global?f=global:"undefined"!=typeof self&&(f=self),f.Really=e()}}(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
 // shim for using process in browser
@@ -9137,12 +9137,14 @@ module.exports = CallbacksBuffer;
 
 
 },{"./protocol":10,"./really-error":13,"lodash":3}],8:[function(require,module,exports){
-var Heartbeat, Logger, Q, logger, protocol;
+var Emitter, Heartbeat, Logger, Q, logger, protocol;
 
 protocol = require('./protocol');
 
 Q = require('q');
 
+Emitter = require('component-emitter');
+
 Logger = require('./logger');
 
 logger = new Logger();
@@ -9150,14 +9152,17 @@ logger = new Logger();
 Heartbeat = (function() {
   var _ping;
 
-  function Heartbeat(interval, timeout) {
+  function Heartbeat(websocket, interval, timeout) {
+    this.websocket = websocket;
     this.interval = interval != null ? interval : 5e3;
     this.timeout = timeout != null ? timeout : 5e3;
-    logger.debug("Heartbeat: initialize with interval: " + interval + " and timeout: " + timeout);
+    if (!this.websocket) {
+      throw Error('websocket should be passed');
+    }
+    logger.debug("Heartbeat: initialize with interval: " + this.interval + " and timeout: " + this.timeout);
   }
 
-  Heartbeat.prototype.start = function(websocket) {
-    this.websocket = websocket;
+  Heartbeat.prototype.start = function() {
     _ping.call(this);
     return logger.debug("Heartbeat: started interval: " + this.interval + " timeout: " + this.timeout);
   };
@@ -9170,6 +9175,7 @@ Heartbeat = (function() {
       return function(data) {
         var lag, now;
         now = Date.now();
+        console.log(data.timestamp);
         lag = (now - data.timestamp) * 0.001;
         logger.debug("Heartbeat: lag " + lag + " second(s)");
         return Q.delay(_this.interval).then(function() {
@@ -9178,13 +9184,20 @@ Heartbeat = (function() {
         });
       };
     })(this);
-    error = function() {
-      logger.debug('Heartbeat: lag exceed');
-      return this.websocket.disconnect();
-    };
+    error = (function(_this) {
+      return function(error) {
+        logger.debug('Heartbeat: lag exceed', error);
+        return _this.stop();
+      };
+    })(this);
     return pingPromise.timeout(this.interval + this.timeout).then(success, error);
   };
 
+  Heartbeat.prototype.stop = function() {
+    this.websocket.socket.close();
+    return this.websocket.emit('heartbeat:lag');
+  };
+
   return Heartbeat;
 
 })();
@@ -9193,7 +9206,7 @@ module.exports = Heartbeat;
 
 
 
-},{"./logger":9,"./protocol":10,"q":4}],9:[function(require,module,exports){
+},{"./logger":9,"./protocol":10,"component-emitter":2,"q":4}],9:[function(require,module,exports){
 var Logger, _,
   __slice = [].slice;
 
@@ -9281,7 +9294,7 @@ VERSION = '0';
 module.exports = {
   clientVersion: VERSION,
   commands: {
-    init: 'init',
+    init: 'initialization',
     create: 'create',
     read: 'read',
     get: 'get',
@@ -10044,8 +10057,8 @@ WebSocketTransport = (function(_super) {
         var heartbeat;
         _this.initialized = true;
         _.flush.call(_this);
-        heartbeat = new Heartbeat(_this.options.heartbeatInterval, _this.options.heartbeatTimeout);
-        heartbeat.start(_this);
+        heartbeat = new Heartbeat(_this, _this.options.heartbeatInterval, _this.options.heartbeatTimeout);
+        heartbeat.start();
         return _this.emit('initialized', data);
       };
     })(this);
diff --git a/src/heartbeat.coffee b/src/heartbeat.coffee
index ff1dc6f..078e24a 100644
--- a/src/heartbeat.coffee
+++ b/src/heartbeat.coffee
@@ -1,33 +1,42 @@
 protocol = require './protocol'
 Q = require 'q'
+Emitter = require 'component-emitter'
 Logger = require './logger'
 logger = new Logger()
 
 class Heartbeat
-  constructor: (@interval = 5e3, @timeout = 5e3) ->
-    logger.debug "Heartbeat: initialize with interval: #{interval} and timeout: #{timeout}"
+  constructor: (@websocket, @interval = 5e3, @timeout = 5e3) ->
+    throw Error('websocket should be passed') unless @websocket
+    
+    logger.debug "Heartbeat: initialize with interval: #{@interval} and timeout: #{@timeout}"
+    
 
-  start: (@websocket) ->
+  start: () ->
     _ping.call(this)
     logger.debug "Heartbeat: started interval: #{@interval} timeout: #{@timeout}"
-  
+
   _ping = () ->
     message = protocol.heartbeatMessage()
     pingPromise = @websocket.send message
 
     success = (data) =>
       now = Date.now()
+      console.log data.timestamp
       lag = (now - data.timestamp) * 0.001
       logger.debug "Heartbeat: lag #{lag} second(s)"
       Q.delay(@interval).then =>
         logger.debug "Heartbeat interval: #{@interval} timeout: #{@timeout}"
         _ping.call(this)
     
-    error = () ->
-      logger.debug 'Heartbeat: lag exceed'
-      @websocket.disconnect()
+    error = (error) =>
+      logger.debug 'Heartbeat: lag exceed', error
+      @stop()
 
     pingPromise.timeout(@interval + @timeout).then success, error
 
+  stop: () ->
+    @websocket.socket.close()
+    @websocket.emit 'heartbeat:lag'
+    
+
 module.exports = Heartbeat
-  
diff --git a/src/protocol.coffee b/src/protocol.coffee
index 9b0c1d5..ea30c5f 100644
--- a/src/protocol.coffee
+++ b/src/protocol.coffee
@@ -11,7 +11,7 @@ module.exports =
   clientVersion: VERSION
 
   commands:
-    init: 'init'
+    init: 'initialization'
     create: 'create'
     read: 'read'
     get: 'get'
diff --git a/tests/heartbeat-spec.coffee b/tests/heartbeat-spec.coffee
new file mode 100644
index 0000000..38febd2
--- /dev/null
+++ b/tests/heartbeat-spec.coffee
@@ -0,0 +1,118 @@
+Heartbeat = require('../src/heartbeat')
+protocol = require '../src/protocol'
+Q = require 'q'
+
+describe 'Heartbeat', ->
+  websocket =
+    send: (message) ->
+      deferred = Q.defer()
+      return deferred.promise
+
+  describe 'initialization', ->
+    it 'should set default interval time and timeout when no parameter passed', ->
+      heartbeat = new Heartbeat(websocket)
+      expect(heartbeat.interval).toEqual 5e3
+      expect(heartbeat.timeout).toEqual 5e3
+
+    it 'should take websocket as a parameter', ->
+      expect ->
+        heartbeat = new Heartbeat()
+      .toThrow Error('websocket should be passed')
+
+  describe 'start', ->
+    it 'should create heartbeat message', ->
+      heartbeat = new Heartbeat(websocket)
+      spyOn(protocol, 'heartbeatMessage').and.callFake ->
+        message =
+          heartbeat: true
+
+      heartbeat.start(websocket)
+      expect(protocol.heartbeatMessage).toHaveBeenCalled()
+
+    it 'should send heartbeat message', ->
+      heartbeat = new Heartbeat(websocket)
+      spyOn(heartbeat.websocket, 'send').and.callFake ->
+        deferred = Q.defer()
+        return deferred.promise
+
+      heartbeat.start()
+      expect(heartbeat.websocket.send).toHaveBeenCalledWith jasmine.any(Object)
+
+    
+    it 'should raise promise success when resolved', (done) ->
+      heartbeat = new Heartbeat(websocket,1000,1000)
+      spyOn(heartbeat.websocket, 'send').and.callFake () ->
+        deferred = Q.defer()
+        deferred.resolve
+          timestamp: 123
+        return deferred.promise
+
+      heartbeat.start()
+      setTimeout( () ->
+        expect(heartbeat.websocket.send.calls.count()).toEqual 2
+        done()
+      , 1500)
+       
+    it 'should raise promise error when timeout', (done) ->
+      heartbeat = new Heartbeat(websocket, 1000, 1000)
+      spyOn(heartbeat, 'stop').and.callThrough()
+      heartbeat.start()
+
+      setTimeout( () ->
+        expect(heartbeat.stop).toHaveBeenCalled()
+        done()
+      , 2500)
+
+    it 'should raise promise error when rejected', (done) ->
+      websocket =
+        send: (message) ->
+          deferred = Q.defer()
+          deferred.reject 'ERROR'
+          return deferred.promise
+
+      heartbeat = new Heartbeat(websocket, 1000, 1000)
+
+      spyOn(heartbeat, 'stop')
+
+      heartbeat.start()
+      setTimeout( () ->
+        expect(heartbeat.stop).toHaveBeenCalled()
+        done()
+      , 0)
+
+  describe 'stop', ->
+    it 'should close websocket', (done) ->
+      websocket =
+        send: (message) ->
+          deferred = Q.defer()
+          deferred.reject 'ERROR'
+          return deferred.promise
+        socket:
+          close: () -> true
+      
+      heartbeat = new Heartbeat(websocket, 1000, 1000)
+      spyOn(heartbeat.websocket.socket, 'close')
+      heartbeat.start()
+      setTimeout( () ->
+        expect(heartbeat.websocket.socket.close).toHaveBeenCalled()
+        done()
+      , 0)
+
+    it 'should fire event on websocket', (done) ->
+      websocket =
+        emit: (msg) -> true
+        send: (message) ->
+          deferred = Q.defer()
+          deferred.reject 'ERROR'
+          return deferred.promise
+        socket:
+          close: () -> true
+
+      
+      heartbeat = new Heartbeat(websocket, 1000, 1000)
+      spyOn(heartbeat.websocket, 'emit')
+      heartbeat.start()
+      setTimeout( () ->
+        expect(heartbeat.websocket.emit).toHaveBeenCalled()
+        done()
+      , 0)
\ No newline at end of file
diff --git a/tests/protocol-spec.coffee b/tests/protocol-spec.coffee
index e97fd2e..53c3de9 100644
--- a/tests/protocol-spec.coffee
+++ b/tests/protocol-spec.coffee
@@ -22,7 +22,7 @@ describe 'protocol', ->
       expect(message).toEqual
         kind: 'initialization'
         data:
-          cmd: 'init'
+          cmd: 'initialization'
           accessToken: 'xxwmn93p0h'
 
   describe 'createMessage', ->