Do anyone know how to delay the br-lan up?

I want to make my application run before the br-lan up. But I do not know how to delay the br-lan up.
So far I make this work via change the default uci_defaults lan.addr=, after my application running, I use the command "ifconfig br-lan".
Do any guy know it?

Run set and then activate it whenever you want

Thank you! Is the command"wifi"?

You can start and stop the lan interface using, ifup lan and ifdown lan in the shell.