MC60 no response to AT commands via qcom

I have flashed example_mqtt code using qflash. I want to send AT commands using qcom, but when I do that, I don’t get any response in qcom. Am I missing something?

After you burn the sdk, the at command you send is sent to the sdk, and only the kernel can recognize the AT command.
You can refer to our ril interface, which has an example of sending at from sdk to kernel