Merge branch 'bugfix/fix_sc_send_failure_and_exit_issue_v4.4' into 'release/v4.4'

smartconfig: fix the issue of sending failure and exit (Backport v4.4)

See merge request espressif/esp-idf!23025

Author: jack0c

components/esp_wifi/src/smartconfig_ack.c

@@ -92,6 +92,7 @@ static void sc_ack_send_task(void *pvParameters)
             port_bit = 0;
         }
         remote_port = SC_ACK_TOUCH_V2_SERVER_PORT(port_bit);
+        memset(remote_ip, 0xFF, sizeof(remote_ip));
     } else {
         remote_port = SC_ACK_AIRKISS_SERVER_PORT;
     }
@@ -165,15 +166,24 @@ static void sc_ack_send_task(void *pvParameters)
                     memcpy(remote_ip, &from.sin_addr, 4);
                     server_addr.sin_addr.s_addr = from.sin_addr.s_addr;
                 } else {
-                    goto _end;
+                    server_addr.sin_addr.s_addr = INADDR_BROADCAST;
                 }
             }
 
+            uint32_t ip_addr = server_addr.sin_addr.s_addr;
             while (s_sc_ack_send) {
                 /* Send smartconfig ACK every 100ms. */
                 vTaskDelay(100 / portTICK_RATE_MS);
 
-                sendlen = sendto(send_sock, &ack->ctx, ack_len, 0, (struct sockaddr*) &server_addr, sin_size);
+                if (ip_addr != INADDR_BROADCAST) {
+                    sendto(send_sock, &ack->ctx, ack_len, 0, (struct sockaddr*) &server_addr, sin_size);
+                    server_addr.sin_addr.s_addr = INADDR_BROADCAST;
+                    sendlen = sendto(send_sock, &ack->ctx, ack_len, 0, (struct sockaddr*) &server_addr, sin_size);
+                    server_addr.sin_addr.s_addr = ip_addr;
+                } else {
+                    sendlen = sendto(send_sock, &ack->ctx, ack_len, 0, (struct sockaddr*) &server_addr, sin_size);
+                }
+
                 if (sendlen <= 0) {
                     err = sc_ack_send_get_errno(send_sock);
                     ESP_LOGD(TAG, "send failed, errno %d", err);