From 5c9a5e6b80b68a456af224236ac1cd51b3f7cb44 Mon Sep 17 00:00:00 2001
From: yuanjm <yuanjianmin@espressif.com>
Date: Tue, 14 Jul 2020 18:12:38 +0800
Subject: [PATCH] feat(lwip): make LWIP TCP rto time configurable

---
 components/lwip/Kconfig                       | 7 +++++++
 components/lwip/lwip                          | 2 +-
 components/lwip/port/esp32/include/lwipopts.h | 6 ++++++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/components/lwip/Kconfig b/components/lwip/Kconfig
index 5468517f9..a95771bed 100644
--- a/components/lwip/Kconfig
+++ b/components/lwip/Kconfig
@@ -435,6 +435,13 @@ config LWIP_WND_SCALE
         help
             Enable this feature to support TCP window scaling.
 
+config LWIP_TCP_RTO_TIME
+        int "Default TCP rto time"
+        default 3000
+        help
+            Set default TCP rto time for a reasonable initial rto.
+            In bad network environment, recommend set value of rto time to 1500.
+
 endmenu # TCP
 
 menu "UDP"
diff --git a/components/lwip/lwip b/components/lwip/lwip
index da2740fa8..f02243aa5 160000
--- a/components/lwip/lwip
+++ b/components/lwip/lwip
@@ -1 +1 @@
-Subproject commit da2740fa8d56b9b9e8a10602f38df1ea4dbd9b74
+Subproject commit f02243aa5f04f6e453e83ecad4700691b9f919d0
diff --git a/components/lwip/port/esp32/include/lwipopts.h b/components/lwip/port/esp32/include/lwipopts.h
index be04739a7..aabd24fcf 100644
--- a/components/lwip/port/esp32/include/lwipopts.h
+++ b/components/lwip/port/esp32/include/lwipopts.h
@@ -376,6 +376,12 @@
 #define TCP_RCV_SCALE                   CONFIG_TCP_RCV_SCALE
 #endif
 
+/**
+ * LWIP_TCP_RTO_TIME: TCP rto time.
+ * Default is 3 second.
+ */
+#define LWIP_TCP_RTO_TIME             CONFIG_LWIP_TCP_RTO_TIME
+
 /*
    ----------------------------------
    ---------- Pbuf options ----------