add event SYSTEM_EVENT_AP_STAIPASSIGNED

components/esp32/event_default_handlers.c

@@ -334,6 +334,10 @@ static esp_err_t esp_system_event_debug(system_event_t *event)
                    MAC2STR(stadisconnected->mac), stadisconnected->aid);
         break;
     }
+    case SYSTEM_EVENT_AP_STAIPASSIGNED: {
+        ESP_LOGD(TAG, "SYSTEM_EVENT_AP_STAIPASSIGNED");
+        break;
+    }
     case SYSTEM_EVENT_AP_PROBEREQRECVED: {
         system_event_ap_probe_req_rx_t *ap_probereqrecved = &event->event_info.ap_probereqrecved;
         ESP_LOGD(TAG, "SYSTEM_EVENT_AP_PROBEREQRECVED, rssi:%d, mac:" MACSTR, \

components/esp32/include/esp_event.h

@@ -44,6 +44,7 @@ typedef enum {
     SYSTEM_EVENT_AP_STOP,                  /**< ESP32 soft-AP stop */
     SYSTEM_EVENT_AP_STACONNECTED,          /**< a station connected to ESP32 soft-AP */
     SYSTEM_EVENT_AP_STADISCONNECTED,       /**< a station disconnected from ESP32 soft-AP */
+    SYSTEM_EVENT_AP_STAIPASSIGNED,         /**< ESP32 soft-AP assign an IP to a connected station */
     SYSTEM_EVENT_AP_PROBEREQRECVED,        /**< Receive probe request packet in soft-AP interface */
     SYSTEM_EVENT_GOT_IP6,                  /**< ESP32 station or ap or ethernet interface v6IP addr is preferred */
     SYSTEM_EVENT_ETH_START,                /**< ESP32 ethernet start */

components/lwip/apps/dhcpserver.c

@@ -95,6 +95,7 @@ static dhcps_lease_t dhcps_poll;
 static dhcps_time_t dhcps_lease_time = DHCPS_LEASE_TIME_DEF;  //minute
 static dhcps_offer_t dhcps_offer = 0xFF;
 static dhcps_offer_t dhcps_dns = 0x00;
+static dhcps_cb_t dhcps_cb;
 
 /******************************************************************************
  * FunctionName : dhcps_option_info
@@ -679,6 +680,10 @@ static void send_ack(struct dhcps_msg *m, u16_t len)
     DHCPS_LOG("dhcps: send_ack>>udp_sendto result %x\n", SendAck_err_t);
 #endif
 
+    if (SendAck_err_t == ERR_OK) {
+        dhcps_cb(m->yiaddr);
+    }
+
     if (p->ref != 0) {
 #if DHCPS_DEBUG
         DHCPS_LOG("udhcp: send_ack>>free pbuf\n");
@@ -1105,6 +1110,19 @@ static void dhcps_poll_set(u32_t ip)
 
 }
 
+
+/******************************************************************************
+ * FunctionName : dhcps_set_new_lease_cb
+ * Description  : set callback for dhcp server when it assign an IP 
+ *                to the connected dhcp client
+ * Parameters   : cb -- callback for dhcp server
+ * Returns      : none
+*******************************************************************************/
+void dhcps_set_new_lease_cb(dhcps_cb_t cb)
+{
+    dhcps_cb = cb;
+}
+
 /******************************************************************************
  * FunctionName : dhcps_start
  * Description  : start dhcp server function

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

@@ -70,6 +70,8 @@ typedef struct {
         dhcps_lease_t dhcps_poll;
 } dhcps_options_t;
 
+typedef void (*dhcps_cb_t)(u8_t client_ip[4]);
+
 static inline bool dhcps_router_enabled (dhcps_offer_t offer) 
 {
     return (offer & OFFER_ROUTER) != 0;
@@ -87,6 +89,7 @@ void dhcps_set_option_info(u8_t op_id, void *opt_info, u32_t opt_len);
 bool dhcp_search_ip_on_mac(u8_t *mac, ip4_addr_t *ip);
 void dhcps_dns_setserver(const ip_addr_t *dnsserver);
 ip4_addr_t dhcps_dns_getserver();
+void dhcps_set_new_lease_cb(dhcps_cb_t cb);
 
 #endif
 

components/tcpip_adapter/tcpip_adapter_lwip.c

@@ -85,6 +85,15 @@ static void tcpip_adapter_api_cb(void* api_msg)
     return;
 }
 
+static void tcpip_adapter_dhcps_cb(u8_t client_ip[4])
+{
+    ESP_LOGI(TAG,"softAP assign IP to station,IP is: %d.%d.%d.%d",
+                client_ip[0],client_ip[1],client_ip[2],client_ip[3]);
+    system_event_t evt;
+    evt.event_id = SYSTEM_EVENT_AP_STAIPASSIGNED;
+    esp_event_send(&evt);
+}
+
 void tcpip_adapter_init(void)
 {
     int ret;
@@ -181,6 +190,8 @@ esp_err_t tcpip_adapter_start(tcpip_adapter_if_t tcpip_if, uint8_t *mac, tcpip_a
         netif_set_up(esp_netif[tcpip_if]);
 
         if (dhcps_status == TCPIP_ADAPTER_DHCP_INIT) {
+            dhcps_set_new_lease_cb(tcpip_adapter_dhcps_cb);
+            
             dhcps_start(esp_netif[tcpip_if], ip_info->ip);
 
             ESP_LOGD(TAG, "dhcp server start:(ip: " IPSTR ", mask: " IPSTR ", gw: " IPSTR ")",