When it comes to Internet of Things (IoT) security research, you may run into roadblocks examining Bluetooth pairing and encryption between older devices and new ones - this blog post explains what you need to know to overcome them.
Good to know. Some Internet people are hell-bent that keeping Connectivity On will take away their soul.
Moving on and after some consideration, I decided that I will continue using the toggle in the Android notifications, as I don't use the Bluetooth as often as I thought I would.
Some of devices have default settings to configure Bluetooth auto connect and auto off.. check your device settings to activate it..Then , you won't leave Bluetooth on even accidentally.Also, there are apps in Play store to achieve this goal.. I don't know if all these apps work 100% successfully. But, you can try..