Sorry just an update
I am using openwrt 19.07 and in that in interface section i want that when user click on save and apply then it saves data to network file. When it saves data to network file i want that should also restart the firewall.
Please connect to your OpenWrt device using ssh and copy the output of the following commands and post it here using the "Preformatted text </> " button:
Remember to redact passwords, MAC addresses and any public IP addresses you may have:
ubus call system board
FWIW, OpenWrt 19.07 has been declared End-of-Support in April 2022 and is no longer maintained or actively supported.