This port of the Omada Software Controller uses a modified omada-common
jar file to alter an OS check to accept "FreeBSD" as a Linux system.
This requires decompiling the jar file with a tool such as Recaf to change
the string matched for the os.name check. The path to the class as
decompiled in Recaf was com/tplink/smb/omada/common/util/S

The function you want to modify looked like this:

    public static boolean c() {
        boolean isLinuxOS = false;
        String osName = System.getProperty("os.name");
        if (osName.toLowerCase(Locale.ROOT).indexOf("linux") > -1) {
            isLinuxOS = true;
        }
        return isLinuxOS;
    }

The specific class that needs to be patched has changed a few times, so
searching for this check may be a requirement to update the port again
or it will not successfully start. The sed/xxd trick used in the
post-patch is hex that changes "linux" to "freebsd".