bluetooth plugin

Hi,
I try the bluetooth plugin demo. (Marketplace)
But I can not get it work.

I got message on console:
WARNING: The ‘plugin.bt’ library is not available on this platform.

I build it to iPad, and can’t work either. (solar2d build #3649, MacOS 11.4, iOS SDK 14.5, Xcode 12.5.1)
Can anyone help?

Bob