Arduino Due in sleep mode

Hi everyone,

I am new in arduino world. I has started this adventure with Nrf24L01 transmitters and receivers examples available.
Now, my idea is to make a sleep mode in the transmitter during 30 seconds and then wake up and sent the data to the receiver, making it constantly. I think that the idea is basic but I don't know how to code this.

Someone could help me?

I am using arduino DUE

PD: Sorry for my level of English.