diff --git a/LocalParticipant.py b/LocalParticipant.py
index b023445..a18e113 100644
--- a/LocalParticipant.py
+++ b/LocalParticipant.py
@@ -33,9 +33,10 @@ class LocalParticipant(Participant):
     others = None
     thread = None
     name = "Participant"
+    isolated_participant = None
 
-    def __init__(self, port=7681, ip_address="0.0.0.0", local_port=0): #, remote=False, udp_socket = None):
-        super().__init__(ip_address = "0.0.0.0", port = port)
+    def __init__(self, port=7681, ip_address=None, local_port=0):
+        super().__init__(ip_address = "127.0.0.1", port = port)
 
         if local_port == 0:
             local_port = port
@@ -50,7 +51,8 @@ class LocalParticipant(Participant):
 
         if self.port != 0:
             self.isolated = False
-            self.remote_site = Participant(ip_address, port)
+            if ip_address is not None:
+                self.remote_site = Participant(ip_address, port)
 
         self.others = []
         self.network_id = 0
@@ -66,6 +68,11 @@ class LocalParticipant(Participant):
         self.thread = threading.Thread(target = self.Receiver)
         self.thread.daemon = True
         self.thread.start()
+    
+    def Isolated():
+        if LocalParticipant.isolated_participant == None:
+            LocalParticipant.isolated_participant = LocalParticipant(0)
+        return LocalParticipant.isolated_participant
 
 #region Update
 
@@ -90,15 +97,16 @@ class LocalParticipant(Participant):
         if currentTimeMs is None:
             currentTimeMs = time.time() * 1000
 
-        if self.publishInterval > 0 and currentTimeMs > self.nextPublishMe:
-            msg = ParticipantMsg(self.network_id)
-            if self.remote_site is None:
-                self.Publish(msg)
-            else:
-                self.Send(self.remote_site, msg)
-                
-            print(f'Publish ParticipantMsg {self.network_id}')
-            self.nextPublishMe = currentTimeMs + self.publishInterval
+        if self.isolated == False:
+            if self.publishInterval > 0 and currentTimeMs > self.nextPublishMe:
+                msg = ParticipantMsg(self.network_id)
+                if self.remote_site is None:
+                    self.Publish(msg)
+                else:
+                    self.Send(self.remote_site, msg)
+                    
+                print(f'Publish ParticipantMsg {self.network_id}')
+                self.nextPublishMe = currentTimeMs + self.publishInterval
 
         for thing in self.things:
             thing.Update(currentTimeMs)
@@ -129,7 +137,7 @@ class LocalParticipant(Participant):
         if buffer_size <= 0:
             return True
         
-        # print(f'{self.name} send {self.buffer[0]} to {owner.ip_address} {owner.port}')
+        print(f'{self.name} send {self.buffer[0]} to {owner.ip_address} {owner.port}')
         self.udp_socket.sendto(self.buffer[:buffer_size], (owner.ip_address, owner.port))
         return True
 
diff --git a/SiteServer.py b/SiteServer.py
index 93b5ec9..ca5356f 100644
--- a/SiteServer.py
+++ b/SiteServer.py
@@ -17,24 +17,27 @@ class SiteServer(LocalParticipant):
         """! Create a new site server
         @param port The UDP port on which communication is received
         """
-        self.ip_address = "0.0.0.0"
-        self.port = port
-        self.local_port = port
+        super().__init__(ip_address = "127.0.0.1", port = port)
+        # self.ip_address = "0.0.0.0"
+        # self.port = port
+        # self.local_port = port
+        self.isolated = False   # site servers are never isolated
+        self.remote_site = None # site servers never have remote sites
 
-        self.others = []
-        self.network_id = 0
-        self.buffer = bytearray(256)
-        self.thing_msg_processors = {}
-        self.new_thing_handlers = []
+        # self.others = []
+        # self.network_id = 0
+        # self.buffer = bytearray(256)
+        # self.thing_msg_processors = {}
+        # self.new_thing_handlers = []
         self.publishInterval = 0
 
-        self.udp_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)        
-        self.udp_socket.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
-        self.udp_socket.bind(("0.0.0.0", self.local_port))
+        # self.udp_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)        
+        # self.udp_socket.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
+        # self.udp_socket.bind(("0.0.0.0", self.local_port))
 
-        self.thread = threading.Thread(target = self.Receiver)
-        self.thread.daemon = True
-        self.thread.start()
+        # self.thread = threading.Thread(target = self.Receiver)
+        # self.thread.daemon = True
+        # self.thread.start()
         
         self.Register(TemperatureSensor, Thing.Type.TemperatureSensor)
 
diff --git a/Thing.py b/Thing.py
index 803ad8b..5fe59fd 100644
--- a/Thing.py
+++ b/Thing.py
@@ -38,6 +38,10 @@ class Thing:
         if parent is not None:
             owner = parent.owner
             self.SetParent(parent)
+        elif owner == None:
+            from LocalParticipant import LocalParticipant            
+            owner = LocalParticipant.Isolated()
+
         self.children = []
 
         ## The participant owning this thing
diff --git a/test/thing_test.py b/test/thing_test.py
index 95bccfb..fc0be68 100644
--- a/test/thing_test.py
+++ b/test/thing_test.py
@@ -32,8 +32,8 @@ class ThingTest(unittest.TestCase):
             site.Update(milliseconds)
 
     def test_site_participant(self):
-        site = SiteServer(7681)
-        participant = LocalParticipant("127.0.0.1", 7681)
+        site = SiteServer(port=7681)
+        participant = LocalParticipant(port=7681, ip_address="127.0.0.1", local_port=7682)
 
         milliseconds = time.time() * 1000
         start_time = milliseconds
@@ -46,7 +46,7 @@ class ThingTest(unittest.TestCase):
     def test_thing_msg(self):
         site = SiteServer()
         
-        participant = LocalParticipant("127.0.0.1")
+        participant = LocalParticipant(ip_address="127.0.0.1", port=7683)
         thing = Thing()
         thing.name = "First thing"
         thing.model_url = "https://passer.life/extras/ant.jpg"