An interval uses to set the parameter of DTIM periods of a radio profile. The DTIM interval means between two DTIM beacon how much
Beacons have been sended.
DTIM is the abbreviation of Delivery Traffic Indication Map. AP will conserve the BTV and broadcast frames for a STA provisionally,
when the STA is in the resting mode. If DTIM is included in a beacon from a ap to a sta, the ap will send the BTV and broadcast
frames which have been conserved provisionally to the STA immediately.
The units of the DTIM interval is beacon, the range of the DTIM interval is from 1 beacon to 255 beacons,
and the default DTIM interval is 3 beacons.