Gl-ar300m, block device client on wireless radio with one shot command (crond)

Hello!
Device gl-ar300m, firmware 3.0.24.
I want to use the “Block” function on a client with a one shot command as a task in crond.
Please help me to get it fly.
Regards
Mikee

That may not be easy. Pls just consider doing this using firewall.

https://openwrt.org/docs/guide-user/firewall/firewall_configuration

start_time
stop_time
src_mac
src_ip

Pls note time may be in UTC. Pls try and verify.