lwip: Allow config TCP_MAXRTX & TCP_SYNMAXRTX in menuconfig

components/lwip/Kconfig

@@ -47,27 +47,41 @@ config LWIP_SO_RCVBUF
         Enabling this option allows checking for available data on a netconn.
 
 config LWIP_DHCP_MAX_NTP_SERVERS
-	int	"Maximum number of NTP servers"
-	default 1
-	range 1 16
-	help
-		Set maxumum number of NTP servers used by LwIP SNTP module.
-		First argument of sntp_setserver/sntp_setservername functions
-		is limited to this value. 
+    int "Maximum number of NTP servers"
+    default 1
+    range 1 16
+    help
+        Set maximum number of NTP servers used by LwIP SNTP module.
+        First argument of sntp_setserver/sntp_setservername functions
+        is limited to this value.
 
 config LWIP_IP_FRAG
     bool "Enable fragment outgoing IP packets"
     default 0
-    help 
+    help
         Enabling this option allows fragmenting outgoing IP packets if their size
         exceeds MTU.
 
 config LWIP_IP_REASSEMBLY
     bool "Enable reassembly incoming fragmented IP packets"
     default 0
-    help 
+    help
         Enabling this option allows reassemblying incoming fragmented IP packets.
 
+config TCP_MAXRTX
+    int "Maximum number of retransmissions of data segments"
+    default 12
+    range 3 12
+    help
+        Set maximum number of retransmissions of data segments.
+
+config TCP_SYNMAXRTX
+    int "Maximum number of retransmissions of SYN segments"
+    default 6
+    range 3 12
+    help
+        Set maximum number of retransmissions of SYN segments.
+
 endmenu
 
 

components/lwip/include/lwip/port/lwipopts.h

@@ -288,12 +288,12 @@
 /**
  * TCP_MAXRTX: Maximum number of retransmissions of data segments.
  */
-#define TCP_MAXRTX                      12  //(*(volatile uint32*)0x600011E8)
+#define TCP_MAXRTX                      CONFIG_TCP_MAXRTX
 
 /**
  * TCP_SYNMAXRTX: Maximum number of retransmissions of SYN segments.
  */
-#define TCP_SYNMAXRTX                   6   //(*(volatile uint32*)0x600011E4)
+#define TCP_SYNMAXRTX                   CONFIG_TCP_SYNMAXRTX
 
 /**
  * TCP_LISTEN_BACKLOG: Enable the backlog option for tcp listen pcb.