How to led trigger tty

Installing and Using OpenWrt
1

Hello everyone,

I use OpenWrt 23.05 and need help.

My question is how to set up tty led trigger.

First, I selected kmod-ledtrig-tty from the kernel module and built it.

The following content was added to the /etc/config/system file.

config led 'led_tty_act'
        option name 'tty_act'
        option sysfs 'red:tty_act'
        option trigger 'tty'
        option mode 'tx rx'
        option dev '/dev/ttyS1'

I tried sending and receiving data by connecting the PC and the device via RS232, but the LED was not triggered.

How do I set it up?

We really appreciate your help.
Thank you in advance.

2

I do not see any tty trigger at /etc/init.d/led; I guess support for it hasn't been created still.