tcpip_adapter: add event declarations

components/tcpip_adapter/include/tcpip_adapter.h

@@ -143,6 +143,31 @@ typedef enum{
 /* Deprecated name for tcpip_adapter_dhcp_option_id_t, to remove after ESP-IDF V4.0 */
 typedef tcpip_adapter_dhcp_option_id_t tcpip_adapter_option_id_t;
 
+/** IP event declarations */
+typedef enum {
+    IP_EVENT_STA_GOT_IP,               /*!< ESP32 station got IP from connected AP */
+    IP_EVENT_STA_LOST_IP,              /*!< ESP32 station lost IP and the IP is reset to 0 */
+    IP_EVENT_AP_STAIPASSIGNED,         /*!< ESP32 soft-AP assign an IP to a connected station */
+    IP_EVENT_GOT_IP6,                  /*!< ESP32 station or ap or ethernet interface v6IP addr is preferred */
+    IP_EVENT_ETH_GOT_IP,               /*!< ESP32 ethernet got IP from connected AP */
+} ip_event_t;
+
+/** @brief IP event base declaration */
+ESP_EVENT_DECLARE_BASE(IP_EVENT);
+
+/** Event structure for IP_EVENT_STA_GOT_IP, IP_EVENT_ETH_GOT_IP events  */
+typedef struct {
+    tcpip_adapter_if_t if_index;        /*!< Interface for which the event is received */
+    tcpip_adapter_ip_info_t ip_info;    /*!< IP address, netmask, gatway IP address */
+    bool ip_changed;                    /*!< Whether the assigned IP has changed or not */
+} ip_event_got_ip_t;
+
+/** Event structure for IP_EVENT_GOT_IP6 event */
+typedef struct {
+    tcpip_adapter_if_t if_index;        /*!< Interface for which the event is received */
+    tcpip_adapter_ip6_info_t ip6_info;  /*!< IPv6 address of the interface */
+} ip_event_got_ip6_t;
+
 /**
  * @brief  Initialize the underlying TCP/IP stack
  *

components/tcpip_adapter/tcpip_adapter_lwip.c

@@ -70,6 +70,8 @@ static sys_sem_t api_lock_sem = NULL;
 extern sys_thread_t g_lwip_task;
 static const char* TAG = "tcpip_adapter";
 
+ESP_EVENT_DEFINE_BASE(IP_EVENT);
+
 static void tcpip_adapter_api_cb(void* api_msg)
 {
     tcpip_adapter_api_msg_t *msg = (tcpip_adapter_api_msg_t*)api_msg;