1. #277 MEI message reception issue with UDP client

2. Fix unit tests
3. Update changelog

CHANGELOG.rst

@@ -10,6 +10,7 @@ Version 1.5.0
 * Move framers from transaction.py to respective modules
 * Fix modbus payload builder and decoder
 * Async servers can now have an option to defer `reactor.run()` when using `Start<Tcp/Serial/Udo>Server(...,defer_reactor_run=True)`
+* Fix UDP client issue while handling MEI messages (ReadDeviceInformationRequest) 
 * Fix Misc examples
 
 Version 1.4.0

examples/common/synchronous_server.py

@@ -112,9 +112,13 @@ def run_server():
     # ----------------------------------------------------------------------- # 
     # Tcp:
     StartTcpServer(context, identity=identity, address=("localhost", 5020))
-
+
+    # TCP with different framer
+    # StartTcpServer(context, identity=identity,
+    #                framer=ModbusRtuFramer, address=("0.0.0.0", 5020))
+
     # Udp:
-    # StartUdpServer(context, identity=identity, address=("localhost", 5020))
+    # StartUdpServer(context, identity=identity, address=("0.0.0.0", 5020))
 
     # Ascii:
     # StartSerialServer(context, identity=identity,

pymodbus/client/sync.py

@@ -240,7 +240,7 @@ def __str__(self):
 
         :returns: The string representation
         """
-        return "%s:%s" % (self.host, self.port)
+        return "ModbusTcpClient(%s:%s)" % (self.host, self.port)
 
 
 # --------------------------------------------------------------------------- #
@@ -330,7 +330,7 @@ def __str__(self):
 
         :returns: The string representation
         """
-        return "%s:%s" % (self.host, self.port)
+        return "ModbusUdpClient(%s:%s)" % (self.host, self.port)
 
 
 # --------------------------------------------------------------------------- #
@@ -478,7 +478,7 @@ def __str__(self):
 
         :returns: The string representation
         """
-        return "%s baud[%s]" % (self.method, self.baudrate)
+        return "ModbusSerialClient(%s baud[%s])" % (self.method, self.baudrate)
 
 # --------------------------------------------------------------------------- #
 # Exported symbols

pymodbus/server/sync.py

@@ -369,7 +369,7 @@ def __init__(self, context, framer=None, identity=None, address=None,
 
         socketserver.ThreadingUDPServer.__init__(self,
             self.address, self.handler)
-        self._BaseServer__shutdown_request = True
+        # self._BaseServer__shutdown_request = True
 
     def process_request(self, request, client):
         """ Callback for connecting a new client thread

pymodbus/transaction.py

@@ -140,6 +140,9 @@ def execute(self, request):
                     full = True
                 else:
                     full = False
+                c_str = str(self.client)
+                if "modbusudpclient" in c_str.lower().strip():
+                    full = True
                 response, last_exception = self._transact(request,
                                                           expected_response_length,
                                                           full=full

test/test_client_sync.py

@@ -91,7 +91,7 @@ def testBasicSyncUdpClient(self):
         client.socket = False
         client.close()
 
-        self.assertEqual("127.0.0.1:502", str(client))
+        self.assertEqual("ModbusUdpClient(127.0.0.1:502)", str(client))
 
     def testUdpClientAddressFamily(self):
         ''' Test the Udp client get address family method'''
@@ -158,7 +158,7 @@ def testBasicSyncTcpClient(self):
         client.socket = False
         client.close()
 
-        self.assertEqual("127.0.0.1:502", str(client))
+        self.assertEqual("ModbusTcpClient(127.0.0.1:502)", str(client))
 
     def testTcpClientConnect(self):
         ''' Test the tcp client connection method'''
@@ -234,7 +234,7 @@ def testBasicSyncSerialClient(self, mock_serial):
         client.socket = False
         client.close()
 
-        self.assertEqual('ascii baud[19200]', str(client))
+        self.assertEqual('ModbusSerialClient(ascii baud[19200])', str(client))
 
     def testSerialClientConnect(self):
         ''' Test the serial client connection method'''

test/test_server_sync.py

@@ -29,7 +29,7 @@
 #---------------------------------------------------------------------------#
 class MockServer(object):
     def __init__(self):
-        self.framer  = lambda _: "framer"
+        self.framer  = lambda _, client=None: "framer"
         self.decoder = "decoder"
         self.threads = []
         self.context = {}
@@ -59,7 +59,6 @@ def testBaseHandlerMethods(self):
         request = ReadCoilsRequest(1, 1)
         address = ('server', 12345)
         server  = MockServer()
-
         with patch.object(ModbusBaseRequestHandler, 'handle') as mock_handle:
             with patch.object(ModbusBaseRequestHandler, 'send') as mock_send:
                 mock_handle.return_value = True