1. Remove ip member of struct station_info

2. Add struct station_list into tcpip_adapter layer
3. When ap -L cmd is received, get mac address from mac layer first and then search ip address based on mac address on dhcp layer.

components/esp32/include/esp_wifi.h

@@ -19,6 +19,7 @@
 #include <stdbool.h>
 
 #include "esp_err.h"
+#include "rom/queue.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -220,6 +221,15 @@ esp_err_t esp_wifi_set_config(wifi_interface_t ifx, wifi_config_t *conf);
 
 esp_err_t esp_wifi_get_config(wifi_interface_t ifx, wifi_config_t *conf);
 
+struct station_info {
+    STAILQ_ENTRY(station_info) next;
+    uint8_t bssid[6];
+};
+
+esp_err_t esp_wifi_get_station_list(struct station_info **station);
+
+esp_err_t esp_wifi_free_station_list(void);
+
 typedef esp_err_t (*wifi_rxcb_t)(void *buffer, uint16_t len, void* eb);
 
 esp_err_t esp_wifi_reg_rxcb(wifi_interface_t ifx, wifi_rxcb_t fn);

components/lwip/apps/dhcpserver.c

@@ -1211,6 +1211,25 @@ u32_t wifi_softap_get_dhcps_lease_time(void) // minute
 {
     return dhcps_lease_time;
 }
+
+/* Search ip address based on mac address */
+bool dhcp_search_ip_on_mac(u8_t *mac, ip4_addr_t *ip)
+{
+    struct dhcps_pool *pdhcps_pool = NULL;
+    list_node *pback_node = NULL;
+    bool ret = false;
+    
+    for (pback_node = plist; pback_node != NULL;pback_node = pback_node->pnext) {
+        pdhcps_pool = pback_node->pnode;
+        if (memcmp(pdhcps_pool->mac, mac, sizeof(pdhcps_pool->mac)) == 0){
+            memcpy(&ip->addr, &pdhcps_pool->ip.addr, sizeof(pdhcps_pool->ip.addr));
+            ret = true;
+            break;
+        }
+    }
+   
+    return ret;
+}
 #else
 #include <stdio.h>
 #include <sys/types.h>
@@ -2477,6 +2496,7 @@ bool wifi_softap_set_dhcps_lease_time(u32_t minute)
     return false;
 }
 
+
 #endif   /*ifdef  LWIP_ESP8266*/
 
 

components/lwip/include/lwip/apps/dhcpserver.h

@@ -77,6 +77,7 @@ extern u32_t dhcps_lease_time;
 void dhcps_start(struct netif *netif);
 void dhcps_stop(struct netif *netif);
 
+bool dhcp_search_ip_on_mac(u8_t *mac, ip4_addr_t *ip);
 #else
 #include "lwip/opt.h"
 

components/tcpip_adapter/include/tcpip_adapter.h

@@ -20,15 +20,26 @@
 #include "esp_wifi.h"
 
 #define CONFIG_TCPIP_LWIP 1
+#define CONFIG_DHCP_STA_LIST 1
 
 #if CONFIG_TCPIP_LWIP
 #include "lwip/ip_addr.h"
+#include "rom/queue.h"
 
 struct ip_info {
     ip4_addr_t ip;
     ip4_addr_t netmask;
     ip4_addr_t gw;
 };
+
+#endif
+
+#if CONFIG_DHCP_STA_LIST 
+struct station_list {
+    STAILQ_ENTRY(station_list) next;
+    uint8_t mac[6];
+    ip4_addr_t ip;
+};
 #endif
 
 #define ESP_ERR_TCPIP_ADAPTER_BASE      0x5000      // base should be moved to esp_err.h
@@ -38,6 +49,7 @@ struct ip_info {
 #define ESP_ERR_TCPIP_ADAPTER_DHCPC_START_FAILED    ESP_ERR_TCPIP_ADAPTER_BASE + 0x02
 #define ESP_ERR_TCPIP_ADAPTER_DHCP_ALREADY_STARTED  ESP_ERR_TCPIP_ADAPTER_BASE + 0x03
 #define ESP_ERR_TCPIP_ADAPTER_DHCP_ALREADY_STOPED   ESP_ERR_TCPIP_ADAPTER_BASE + 0x04
+#define ESP_ERR_TCPIP_ADAPTER_NO_MEM                ESP_ERR_TCPIP_ADAPTER_BASE + 0x05
 
 /* will add ethernet interface */
 typedef enum {
@@ -96,5 +108,8 @@ esp_err_t tcpip_adapter_output(tcpip_adapter_if_t tcpip_if, void *buffer, uint16
 
 wifi_interface_t tcpip_adapter_get_wifi_if(void *dev);
 
+esp_err_t tcpip_adapter_get_sta_list(struct station_info *sta_info, struct station_list **sta_list);
+esp_err_t tcpip_adapter_free_sta_list(struct station_list *sta_list);
+
 #endif /*  _TCPIP_ADAPTER_H_ */
 

components/tcpip_adapter/tcpip_adapter_lwip.c

@@ -455,4 +455,49 @@ wifi_interface_t tcpip_adapter_get_wifi_if(void *dev)
 
     return WIFI_IF_MAX;
 }
+
+esp_err_t tcpip_adapter_get_sta_list(struct station_info *sta_info, struct station_list **sta_list)
+{
+    struct station_info *info = sta_info;
+    struct station_list *list;
+    STAILQ_HEAD(, station_list) list_head;
+
+    if (sta_list == NULL)
+        return ESP_ERR_TCPIP_ADAPTER_INVALID_PARAMS;
+
+    STAILQ_INIT(&list_head);
+
+    while (info != NULL) {
+        list = (struct station_list *)malloc(sizeof(struct station_list));
+        memset(list, 0, sizeof (struct station_list));
+
+        if (list == NULL) {
+            return ESP_ERR_TCPIP_ADAPTER_NO_MEM;
+        }
+
+        memcpy(list->mac, info->bssid, 6);
+        dhcp_search_ip_on_mac(list->mac, &list->ip);
+        STAILQ_INSERT_TAIL(&list_head, list, next);
+      
+        info = STAILQ_NEXT(info, next);
+    }
+
+    *sta_list = STAILQ_FIRST(&list_head);
+
+    return ESP_OK;
+}
+
+esp_err_t tcpip_adapter_free_sta_list(struct station_list *sta_list)
+{
+    struct station_list *list = sta_list;
+
+    while (sta_list != NULL) {
+        list = sta_list;
+        sta_list = STAILQ_NEXT(sta_list, next);
+        free(list);
+    }
+
+    return ESP_OK;
+}
+
 #endif