@beeshyams I was writing my answer and I recalled seeing a native command line action in MacroDroid, but when I couldn't find it I settled with Secure Settings.
Folks, I'm scratching my head about Bluetooth Low Energy. Android 4.3 device can be a Bluetooth client. In a typical scenario a tablet is a central (master) and a client, while a heart rate monitor - or some such small gizmo - is a peripheral (slave) server. But can an Android 4.3 device be a central and a server?