This service can be used to indicate WLAN status by blinking the unused LED.
Please make sure that the requirements are satisfied and install wlanblinker and luci-app-wlanblinker from Web UI or connect to your router via ssh and run the following commands:
opkg update
opkg install wlanblinker luci-app-wlanblinker
If these packages are not found in the official feed/repo for your version of OpenWrt, you will need to add a custom repo to your router following instructions on GitHub/jsDelivr first.
These packages have been designed to be backwards compatible with OpenWrt 19.07, OpenWrt 18.06, OpenWrt Project 17.01 and OpenWrt 15.05. However, on systems older than OpenWrt 18.06.6 and/or a system which has deviated too far (or haven’t been updated to keep in-sync) with official OpenWrt release you may get a message about missing luci-compat dependency, which (and only which) you can safely ignore and force-install the luci app using opkg install --force-depends command instead of opkg install.
Default configuration has service disabled (use Web UI to enable/start service or run uci set wlanblinker.config.enabled=1; uci commit wlanblinker;).