!238 Modify line 818 of the at_socket.c file from LOG_E to LOG_D

Merge pull request !238 from qiyongzhong0/gitee_master

components/net/at/at_socket/at_socket.c

@@ -815,7 +815,7 @@ int at_recvfrom(int socket, void *mem, size_t len, int flags, struct sockaddr *f
         /* wait the receive semaphore */
         if (rt_sem_take(sock->recv_notice, timeout) < 0)
         {
-            LOG_E("AT socket (%d) receive timeout (%d)!", socket, timeout);
+            LOG_D("AT socket (%d) receive timeout (%d)!", socket, timeout);
             errno = EAGAIN;
             result = -1;
             goto __exit;