Update at_socket.c

components/net/at/at_socket/at_socket.c

@@ -714,9 +714,21 @@ __exit:
         }
     }
     else
+    {
+        /* try to read Legacy data */
+        /* receive packet list last transmission of remaining data */
+        rt_mutex_take(sock->recv_lock, RT_WAITING_FOREVER);
+        recv_len = at_recvpkt_get(&(sock->recvpkt_list), (char *)mem, len);
+        rt_mutex_release(sock->recv_lock);
+        if(recv_len<=0)
         {    
             at_do_event_changes(sock, AT_EVENT_ERROR, RT_TRUE);
         }
+        else
+        {
+            result = recv_len;
+        }  
+    }
 
     return result;
 }