Coap protocol for cinterion modules, choose of ack mode | Telit Cinterion IoT Developer Community

Hi, I'm trying to use CoAP protocol for sending messages using a TX module.
I'd like to know about choosing the ack mode. 

Like I've seen in AWS tutorial about CoAP (link above), the Coap client (the module) choose if it wants to receive ack message or not. But I didn't find about this choose in TX AT commando specifications.

Thanks,

https://docs.aws.amazon.com/whitepapers/latest/implementing-lpwan-soluti...