@alpha1974
Doing what I describe just enables the WiFi by default in the standard LEDE image for the AR300M.
ie SSID is LEDE and no password. It is then up to you to set it as you want it.
You can build the image with your own wifi defaults by putting in the relevant UCI commands into the uci-defaults/customwifi file just as I did to turn on the wifi.
If you are not familiar with all this, a good starting point is:
https://lede-project.org/docs/user-guide/introduction_to_lede_configuration
and