GL.iNet GL-AR300M16-Ext (USB Serial Port)

Does the USB serial port on the GL.iNet GL-AR300M16-Ext have any functionality after loading AREDN firmware?

I am asking because I have a solar charge controller that is accessible via serial port and I would like to intergrate that charger controller into my AREDN network at my location.

Thanks in advance.

Hank / K1DOS