diff --git a/ryu/controller/api.py b/ryu/controller/api.py
index 7dfc08dd..4d3e87db 100644
--- a/ryu/controller/api.py
+++ b/ryu/controller/api.py
@@ -6,6 +6,7 @@ from ryu.controller import handler
 from ryu.controller import dpset
 from ryu.ofproto.ofproto_parser import MsgBase
 from ryu.lib.rpc import RpcSession, RpcMessage
+from ryu.ofproto import ofproto_parser
 from ryu.ofproto import ofproto_v1_0
 from ryu.ofproto import ofproto_v1_0_parser
 from ryu.ofproto import ofproto_v1_2
@@ -14,20 +15,29 @@ from ryu.ofproto import ofproto_v1_3
 from ryu.ofproto import ofproto_v1_3_parser
 
 
+def find_ofp_cls(ofp_version, name):
+    parser_name = 'ryu.ofproto.ofproto_v1_' + str(ofp_version - 1) + \
+        '_parser'
+    mod = sys.modules[parser_name]
+    for i in inspect.getmembers(mod, lambda cls: (inspect.isclass(cls))):
+        if i[0] == name:
+            return i[1]
+    return None
+
+
 class OFWireRpcSession(object):
     def __init__(self, socket, dpset):
         self.socket = socket
         self.dpset = dpset
         self.session = RpcSession()
+        self.pool = eventlet.GreenPool()
+        self.send_queue = eventlet.queue.Queue()
+        self.pool.spawn_n(self._send)
 
-    def _find_ofp_cls(self, ofp_version, name):
-        parser_name = 'ryu.ofproto.ofproto_v1_' + str(ofp_version - 1) + \
-            '_parser'
-        mod = sys.modules[parser_name]
-        for i in inspect.getmembers(mod, lambda cls: (inspect.isclass(cls))):
-            if i[0] == name:
-                return i[1]
-        return None
+    def _send(self):
+        while True:
+            m = self.send_queue.get()
+            self.socket.sendall(m)
 
     def _ofp_handle_match(self, clses, params):
         match = clses()
@@ -40,7 +50,7 @@ class OFWireRpcSession(object):
         for k, v in params.items():
             if type(v) == dict:
                 self._ofp_handle_params(dp, v)
-                clses = self._find_ofp_cls(dp.ofproto.OFP_VERSION, k)
+                clses = find_ofp_cls(dp.ofproto.OFP_VERSION, k)
                 if clses is not None:
                     if issubclass(clses, MsgBase):
                         ins = clses(dp, **v)
@@ -68,17 +78,17 @@ class OFWireRpcSession(object):
         params = msg[3][1]
         dp = self.dpset.get(int(dpid))
         if dp is None:
-            print self.dpset.get_all()
             r = self.session.create_response(msg[1], 1, 0)
-            self.socket.sendall(r)
+            self.send_queue.put(r)
             return
 
         self._ofp_handle_params(dp, params)
+        result = {}
         for k, v in params.items():
             dp.send_msg(v)
-
-        r = self.session.create_response(msg[1], 0, 0)
-        self.socket.sendall(r)
+            result = {'xid': v.xid}
+        r = self.session.create_response(msg[1], 0, result)
+        self.send_queue.put(r)
 
     def serve(self):
         while True:
@@ -98,14 +108,14 @@ class OFWireRpcSession(object):
                     print "invalid type", m
 
 
-class RpcApi(app_manager.RyuApp):
+class RPCApi(app_manager.RyuApp):
     _CONTEXTS = {
         'dpset': dpset.DPSet,
     }
 
     def __init__(self, *args, **kwargs):
         self.dpset = kwargs['dpset']
-        super(RpcApi, self).__init__(*args, **kwargs)
+        super(RPCApi, self).__init__(*args, **kwargs)
         self.server = eventlet.listen(('', 50000))
         self.pool = eventlet.GreenPool()
         self.pool.spawn_n(self.serve)
@@ -118,14 +128,50 @@ class RpcApi(app_manager.RyuApp):
             self.sessions.append(session)
             self.pool.spawn_n(session.serve)
 
+    def _ofp_handle_ob(self, dp, msg, params):
+        clses = find_ofp_cls(dp.ofproto.OFP_VERSION,
+                             msg.__class__.__name__)
+        if clses:
+            params[msg.__class__.__name__] = {}
+            _params = params[msg.__class__.__name__]
+        else:
+            _params = params
+
+        for i in ofproto_parser.ofp_attr(msg):
+            if i.startswith('_'):
+                continue
+            elif i == 'parser':
+                continue
+            elif i == 'serialize':
+                continue
+
+            v = getattr(msg, i)
+            if type(v) == dict:
+                _params[i] = {}
+                for key in v.keys():
+                    _params[i][key] = {}
+                    self._ofp_handle_ob(dp, v[key], _params[i][key])
+            elif type(v) == list:
+                ins = []
+                for j in v:
+                    d = {}
+                    self._ofp_handle_ob(dp, j, d)
+                    ins.append(d)
+                _params[i] = ins
+            elif type(v).__name__ == 'builtin_function_or_method':
+                pass
+            else:
+                _params[i] = v
+
     @handler.observe_all_events('ofp_event')
     def handler(self, ev):
         if hasattr(ev, 'msg'):
+            ofmsg = ev.msg
             params = {}
-            params[type(ev.msg).__name__] = {}
-            for m in inspect.getmembers(ev.msg):
-                if not m[0].startswith('__'):
-                    # we need a mechnism to get _only_ OFP defined members.
-                    params[type(ev.msg).__name__][m[0]] = m[1]
+            self._ofp_handle_ob(ofmsg.datapath, ofmsg, params)
+            for k in params.keys():
+                params[k]['xid'] = ofmsg.xid
 
-            # send this to all sessions as a notification.
+            for s in self.sessions:
+                m = s.session.create_notification('ofp', params)
+                s.send_queue.put(m)