AT client组件返回超时如何解决

使用AT clien，判断

if (at_exec_cmd(resp, "AT+DMOVERQ") != RT_EOK)

{

            LOG_E("AT client send commands failed, response error or timeout !");

        }

返回-2（超时），但打印返回数据正确

sendline: 0000-0020: 41 54 2B 44 4D 4F 56 45 52 51 AT+DMOVERQ

[D/AT] recvline: 0000-0020: 00 00 00 00 00 00 2B 44 4D 4F 56 45 52 3A 56 32 30 34 0D 0A ......+DMOVER:V204..

[D/at.clnt] execute command (AT+DMOVERQ) timeout (2000 ticks)!

[E/at] AT client send commands failed, response error or timeout !

[D/at] resp->line_counts:1