Improve Default Macros

.github/.cSpellWords.txt

@@ -206,6 +206,7 @@ DEAS
 DEBR
 DEBUGEN
 DEBUGF
+DECASECONDS
 DEFFERRALCHECK
 DEFR
 Deglitchers

source/CMakeLists.txt

@@ -5,6 +5,7 @@ set_property(TARGET freertos_plus_tcp PROPERTY C_STANDARD 90)
 target_sources( freertos_plus_tcp
   PRIVATE
       include/FreeRTOSIPConfigDefaults.h
+      include/FreeRTOSIPDeprecatedDefinitions.h
       include/FreeRTOS_ARP.h
       include/FreeRTOS_BitConfig.h
       include/FreeRTOS_DHCP.h
@@ -40,7 +41,6 @@ target_sources( freertos_plus_tcp
       include/FreeRTOS_TCP_Utils.h
       include/FreeRTOS_TCP_WIN.h
       include/FreeRTOS_UDP_IP.h
-      include/FreeRTOS_errno_TCP.h
       include/IPTraceMacroDefaults.h
       include/NetworkBufferManagement.h
       include/NetworkInterface.h

source/FreeRTOS_IP_Utils.c

@@ -1489,7 +1489,7 @@ uint16_t usGenerateChecksum( uint16_t usSum,
 
 /**
  * @brief Utility function: Convert error number to a human readable
- *        string. Declaration in FreeRTOS_errno_TCP.h.
+ *        string.
  *
  * @param[in] xErrnum The error number.
  * @param[in] pcBuffer Buffer big enough to be filled with the human readable message.

source/FreeRTOS_Sockets.c

@@ -572,10 +572,9 @@ static BaseType_t prvDetermineSocketSize( BaseType_t xDomain,
             {
                 uint16_t usDifference = ipSIZE_OF_IPv6_HEADER - ipSIZE_OF_IPv4_HEADER;
 
-                if( pxSocket->u.xTCP.usMSS > usDifference )
-                {
-                    pxSocket->u.xTCP.usMSS = ( uint16_t ) ( pxSocket->u.xTCP.usMSS - usDifference );
-                }
+                /* Because ipconfigTCP_MSS is guaranteed not less than tcpMINIMUM_SEGMENT_LENGTH by FreeRTOSIPConfigDefaults.h,
+                 * it's unnecessary to check if xSocket->u.xTCP.usMSS is greater than difference. */
+                pxSocket->u.xTCP.usMSS = ( uint16_t ) ( pxSocket->u.xTCP.usMSS - usDifference );
             }
         #endif /* ipconfigUSE_IPv6 != 0 */
 
@@ -1259,8 +1258,7 @@ static int32_t prvRecvFrom_CopyPacket( uint8_t * pucEthernetBuffer,
  *                  (24-bytes) for compatibility.
  *
  * @return The number of bytes received. Or else, an error code is returned. When it
- *         returns a negative value, the cause can be looked-up in
- *         'FreeRTOS_errno_TCP.h'.
+ *         returns a negative value, the cause can be looked-up in 'FreeRTOS-Kernel/projdefs.h'.
  */
 int32_t FreeRTOS_recvfrom( const ConstSocket_t xSocket,
                            void * pvBuffer,
@@ -1570,7 +1568,7 @@ static int32_t prvSendTo_ActualSend( const FreeRTOS_Socket_t * pxSocket,
  *                  Berkeley sockets standard. Else, it is not used.
  *
  * @return When positive: the total number of bytes sent, when negative an error
- *         has occurred: it can be looked-up in 'FreeRTOS_errno_TCP.h'.
+ *         has occurred: it can be looked-up in 'FreeRTOS-Kernel/projdefs.h'.
  */
 int32_t FreeRTOS_sendto( Socket_t xSocket,
                          const void * pvBuffer,

source/FreeRTOS_TCP_IP.c

@@ -301,9 +301,11 @@
         {
             /* A socket was in the connecting phase but something
              * went wrong and it should be closed. */
-            FreeRTOS_debug_printf( ( "Move from %s to %s\n",
-                                     FreeRTOS_GetTCPStateName( ( UBaseType_t ) xPreviousState ),
-                                     FreeRTOS_GetTCPStateName( eTCPState ) ) );
+            #if ( ipconfigHAS_DEBUG_PRINTF != 0 )
+                FreeRTOS_debug_printf( ( "Move from %s to %s\n",
+                                         FreeRTOS_GetTCPStateName( ( UBaseType_t ) xPreviousState ),
+                                         FreeRTOS_GetTCPStateName( eTCPState ) ) );
+            #endif
 
             /* Set the flag to show that it was connected before and that the
              * status has changed now. This will cause the control flow to go

source/FreeRTOS_TCP_Utils_IPv6.c

@@ -82,18 +82,10 @@ void prvSocketSetMSS_IPV6( FreeRTOS_Socket_t * pxSocket )
             /* Compared to IPv4, an IPv6 header is 20 bytes longer.
              * It must be subtracted from the MSS. */
             size_t uxDifference = ipSIZE_OF_IPv6_HEADER - ipSIZE_OF_IPv4_HEADER;
-            /* Do not allow MSS smaller than tcpMINIMUM_SEGMENT_LENGTH. */
-            #if ( ipconfigTCP_MSS >= tcpMINIMUM_SEGMENT_LENGTH )
-            {
-                ulMSS = ipconfigTCP_MSS;
-            }
-            #else
-            {
-                ulMSS = tcpMINIMUM_SEGMENT_LENGTH;
-            }
-            #endif
 
-            ulMSS = ( uint32_t ) ( ulMSS - uxDifference );
+            /* Because ipconfigTCP_MSS is guaranteed not less than tcpMINIMUM_SEGMENT_LENGTH by FreeRTOSIPConfigDefaults.h,
+             * it's unnecessary to check if xSocket->u.xTCP.usMSS is greater than difference. */
+            ulMSS = ( uint32_t ) ( ipconfigTCP_MSS - uxDifference );
             IPv6_Type_t eType = xIPv6_GetIPType( &( pxSocket->u.xTCP.xRemoteIP.xIP_IPv6 ) );
 
             if( eType == eIPv6_Global )