diff --git a/DemoTasks/SimpleTCPEchoServer.c b/DemoTasks/SimpleTCPEchoServer.c
index acb6ced..f33acdf 100644
--- a/DemoTasks/SimpleTCPEchoServer.c
+++ b/DemoTasks/SimpleTCPEchoServer.c
@@ -159,9 +159,8 @@ struct freertos_sockaddr xClient, xBindAddress;
 Socket_t xListeningSocket, xConnectedSocket;
 socklen_t xSize = sizeof( xClient );
 static const TickType_t xReceiveTimeOut = portMAX_DELAY;
-const BaseType_t xBacklog = 20;
+const BaseType_t xBacklog = 1;
 
-	
 #if( ipconfigUSE_TCP_WIN == 1 )
 	WinProperties_t xWinProps;
 
@@ -174,6 +173,8 @@ const BaseType_t xBacklog = 20;
 
 	/* Just to prevent compiler warnings. */
 	( void ) pvParameters;
+	
+#ifdef DEBUG_LISTEN_SOCK	
 
 	/* Attempt to open the socket. */
 	xListeningSocket = FreeRTOS_socket( FREERTOS_AF_INET, FREERTOS_SOCK_STREAM, FREERTOS_IPPROTO_TCP );
@@ -221,6 +222,57 @@ const BaseType_t xBacklog = 20;
 		/* Spawn a task to handle the connection. */
 		xTaskCreate( prvServerConnectionInstance, "EchoServer", usUsedStackSize, ( void * ) xConnectedSocket, tskIDLE_PRIORITY + 1, &prvServerConnectionInstance_Handle );				
 	}
+	
+#else	/*DEBUG_LISTEN_SOCK*/
+	
+	for( ;; )
+	{	
+		/* Delete previous suspended EchoServer task if it was created. */
+		if (prvServerConnectionInstance_Handle && eSuspended == eTaskGetState( prvServerConnectionInstance_Handle) )
+		{						
+			vTaskDelete( prvServerConnectionInstance_Handle );		
+		}		
+	/* Attempt to open the socket. */
+	xListeningSocket = FreeRTOS_socket( FREERTOS_AF_INET, FREERTOS_SOCK_STREAM, FREERTOS_IPPROTO_TCP );
+	configASSERT( xListeningSocket != FREERTOS_INVALID_SOCKET );
+
+	/* Set a time out so accept() will just wait for a connection. */
+	FreeRTOS_setsockopt( xListeningSocket, 0, FREERTOS_SO_RCVTIMEO, &xReceiveTimeOut, sizeof( xReceiveTimeOut ) );
+
+	/* Set the window and buffer sizes. */
+	#if( ipconfigUSE_TCP_WIN == 1 )
+	{
+		FreeRTOS_setsockopt( xListeningSocket, 0, FREERTOS_SO_WIN_PROPERTIES|FREERTOS_SO_REUSE_LISTEN_SOCKET, ( void * ) &xWinProps, sizeof( xWinProps ) );
+	}
+	#endif /* ipconfigUSE_TCP_WIN */
+
+	/* Bind the socket to the port that the client task will send to, then
+	listen for incoming connections. */
+	xBindAddress.sin_port = tcpechoPORT_NUMBER;
+	xBindAddress.sin_port = FreeRTOS_htons( xBindAddress.sin_port );
+#if (ipconfigUSE_DHCP == 0)	
+	xBindAddress.sin_addr = FreeRTOS_htonl(xNetworkAddressing.ulDefaultIPAddress);
+#endif	
+	FreeRTOS_bind( xListeningSocket, &xBindAddress, sizeof( xBindAddress ) );
+	FreeRTOS_listen( xListeningSocket, xBacklog );
+
+						
+		/* Wait for a client to connect. */	
+		xConnectedSocket = FreeRTOS_accept( xListeningSocket, &xClient, &xSize );
+		configASSERT( xConnectedSocket != FREERTOS_INVALID_SOCKET );							
+		//FreeRTOS_debug_printf(("Heap size TCP 0 = %d\n", xPortGetFreeHeapSize()));
+				
+#ifdef DEBUG		
+		size_t FreeHeapSize = xPortGetFreeHeapSize();
+		if(FreeHeapSize < 25032)//45520)
+		{			
+			FreeRTOS_printf(("[LISTEN_TASK] FreeHeapSize = %d\n", FreeHeapSize));			
+		}
+#endif		
+		/* Spawn a task to handle the connection. */
+		xTaskCreate( prvServerConnectionInstance, "EchoServer", usUsedStackSize, ( void * ) xConnectedSocket, tskIDLE_PRIORITY + 1, &prvServerConnectionInstance_Handle );				
+	}	
+#endif /*DEBUG_LISTEN_SOCK*/
 }
 /*-----------------------------------------------------------*/
 
@@ -256,7 +308,7 @@ uint8_t *pucRxBuffer;
 			lBytes = FreeRTOS_recv( xConnectedSocket, pucRxBuffer, ipconfigTCP_MSS, 0 );
 
 			/* If data was received, echo it back. */
-			if( lBytes >= 0 )
+			if( lBytes > 0 )
 			{							
 				RF_OUT_ENUM state = -1;
 				int8_t enable = -1;
diff --git a/Test_project_for_GD32107C-EVAL.uvguix.right b/Test_project_for_GD32107C-EVAL.uvguix.right
index 68a1c47..efd26ba 100644
--- a/Test_project_for_GD32107C-EVAL.uvguix.right
+++ b/Test_project_for_GD32107C-EVAL.uvguix.right
@@ -15,17 +15,17 @@
     <View>
       <WinId>38003</WinId>
       <ViewName>Registers</ViewName>
-      <TableColWidths>269 270</TableColWidths>
+      <TableColWidths>269 117</TableColWidths>
     </View>
     <View>
       <WinId>346</WinId>
       <ViewName>Code Coverage</ViewName>
-      <TableColWidths>1404 186</TableColWidths>
+      <TableColWidths>1404 339</TableColWidths>
     </View>
     <View>
       <WinId>204</WinId>
       <ViewName>Performance Analyzer</ViewName>
-      <TableColWidths>1022 234 234 100</TableColWidths>
+      <TableColWidths>1122 234 234 153</TableColWidths>
     </View>
   </SECTreeCtrl>
 
@@ -93,8 +93,8 @@
       <flags>2</flags>
       <showCmd>3</showCmd>
       <MinPosition>
-        <xPos>-1</xPos>
-        <yPos>-1</yPos>
+        <xPos>-32000</xPos>
+        <yPos>-32000</yPos>
       </MinPosition>
       <MaxPosition>
         <xPos>-1</xPos>
@@ -110,8 +110,8 @@
     <MDIClientArea>
       <RegID>0</RegID>
       <MDITabState>
-        <Len>1557</Len>
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     </MDIClientArea>
     <ViewEx>
@@ -1805,8 +1805,8 @@
         <RegID>59392</RegID>
         <Name>File</Name>
         <Buttons>
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@@ -1871,11 +1871,11 @@
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           <Len>16</Len>
-          <Data>29020000560400006908000025050000</Data>
+          <Data>90010000AF0300006507000025050000</Data>
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-          <Data>29020000780400006908000047050000</Data>
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@@ -1891,7 +1891,7 @@
         <RecentRowIndex>0</RecentRowIndex>
         <RectRecentDocked>
           <Len>16</Len>
-          <Data>03000000830000002202000002050000</Data>
+          <Data>03000000830000008901000002050000</Data>
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@@ -1931,7 +1931,7 @@
         <RecentRowIndex>0</RecentRowIndex>
         <RectRecentDocked>
           <Len>16</Len>
-          <Data>7008000083000000FD09000002050000</Data>
+          <Data>6C07000083000000FD09000002050000</Data>
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@@ -1951,7 +1951,7 @@
         <RecentRowIndex>0</RecentRowIndex>
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           <Len>16</Len>
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+          <Data>6C07000083000000FD09000002050000</Data>
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index 0eebea6..da878e9 100644
--- a/Test_project_for_GD32107C-EVAL.uvoptx
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