From 922992b51928f985e426cc49432b41f78aada797 Mon Sep 17 00:00:00 2001
From: yuanjm <yuanjianmin@espressif.com>
Date: Fri, 7 May 2021 11:36:13 +0800
Subject: [PATCH] event: Add IP_EVENT_ETH_LOST_IP event

Closes https://github.com/espressif/esp-idf/issues/6971
---
 components/esp_event/event_send.c                 | 3 +++
 components/esp_event/include/esp_event_legacy.h   | 1 +
 components/esp_netif/include/esp_netif_defaults.h | 2 +-
 components/esp_netif/include/esp_netif_types.h    | 1 +
 docs/en/api-guides/event-handling.rst             | 3 +++
 5 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/components/esp_event/event_send.c b/components/esp_event/event_send.c
index 20098bc142..bc5aef9d37 100644
--- a/components/esp_event/event_send.c
+++ b/components/esp_event/event_send.c
@@ -121,6 +121,9 @@ static system_event_id_t esp_event_legacy_ip_event_id(int32_t event_id)
     case IP_EVENT_ETH_GOT_IP:
         return SYSTEM_EVENT_ETH_GOT_IP;
 
+    case IP_EVENT_ETH_LOST_IP:
+        return SYSTEM_EVENT_ETH_LOST_IP;
+
     default:
         ESP_LOGE(TAG, "invalid ip event id %d", event_id);
         return SYSTEM_EVENT_MAX;
diff --git a/components/esp_event/include/esp_event_legacy.h b/components/esp_event/include/esp_event_legacy.h
index 021ac4075b..dbeeced674 100644
--- a/components/esp_event/include/esp_event_legacy.h
+++ b/components/esp_event/include/esp_event_legacy.h
@@ -58,6 +58,7 @@ typedef enum {
     SYSTEM_EVENT_ETH_CONNECTED,            /*!< ESP32 ethernet phy link up */
     SYSTEM_EVENT_ETH_DISCONNECTED,         /*!< ESP32 ethernet phy link down */
     SYSTEM_EVENT_ETH_GOT_IP,               /*!< ESP32 ethernet got IP from connected AP */
+    SYSTEM_EVENT_ETH_LOST_IP,              /*!< ESP32 ethernet lost IP and the IP is reset to 0 */
     SYSTEM_EVENT_MAX                       /*!< Number of members in this enum */
 } system_event_id_t;
 
diff --git a/components/esp_netif/include/esp_netif_defaults.h b/components/esp_netif/include/esp_netif_defaults.h
index 7ef65260d4..903a678e00 100644
--- a/components/esp_netif/include/esp_netif_defaults.h
+++ b/components/esp_netif/include/esp_netif_defaults.h
@@ -55,7 +55,7 @@ extern "C" {
         ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_EMPTY(mac) \
         ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_EMPTY(ip_info) \
         .get_ip_event = IP_EVENT_ETH_GOT_IP, \
-        .lost_ip_event = 0, \
+        .lost_ip_event = IP_EVENT_ETH_LOST_IP, \
         .if_key = "ETH_DEF", \
         .if_desc = "eth", \
         .route_prio = 50 \
diff --git a/components/esp_netif/include/esp_netif_types.h b/components/esp_netif/include/esp_netif_types.h
index 044ca0d111..7c68c7172a 100644
--- a/components/esp_netif/include/esp_netif_types.h
+++ b/components/esp_netif/include/esp_netif_types.h
@@ -88,6 +88,7 @@ typedef enum {
     IP_EVENT_AP_STAIPASSIGNED,         /*!< soft-AP assign an IP to a connected station */
     IP_EVENT_GOT_IP6,                  /*!< station or ap or ethernet interface v6IP addr is preferred */
     IP_EVENT_ETH_GOT_IP,               /*!< ethernet got IP from connected AP */
+    IP_EVENT_ETH_LOST_IP,              /*!< ethernet lost IP and the IP is reset to 0 */
     IP_EVENT_PPP_GOT_IP,               /*!< PPP interface got IP */
     IP_EVENT_PPP_LOST_IP,              /*!< PPP interface lost IP */
 } ip_event_t;
diff --git a/docs/en/api-guides/event-handling.rst b/docs/en/api-guides/event-handling.rst
index e0a163b471..65de97f1ad 100644
--- a/docs/en/api-guides/event-handling.rst
+++ b/docs/en/api-guides/event-handling.rst
@@ -123,6 +123,9 @@ Event IDs and Corresponding Data Structures
 | IP_EVENT_ETH_GOT_IP                | :cpp:class:`ip_event_got_ip_t`                |
 | (SYSTEM_EVENT_ETH_GOT_IP)          |                                               |
 +------------------------------------+-----------------------------------------------+
+| IP_EVENT_ETH_LOST_IP               | n/a                                           |
+| (SYSTEM_EVENT_ETH_LOST_IP)         |                                               |
++------------------------------------+-----------------------------------------------+
 
 Mesh Events
 -----------