Need help with M66-R2.0 MQTT data retriving

IoT Modules GSM Module
1

Hi. I am able to implement mqtt publishing and subscribing successfully using AT commands. when ever a device is publishing to the subscribed topic, iam getting the published payload data instantly through uart (ex: +QMTRECV: x,x,x,payload).

Now, the issue is that, my microcontroller will sometimes be busy in other time critical functions and sometimes missed to read the uart data. is there a way to detect and retrive this payload again using AT commands.

2

Hi. is there anyway to retrive the subscribed mqtt payload again after it is transmitted through the uart.
If not possible, then i will have to change microcontroller before the pcb design starts.
so i want to know if it can be done or not, as soon as possible.

thankyou.