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Turn on / off the device using bluetooth and application

I want to do something, and I'm not sure where to start. I tried searching, but the problem is that I don’t know where to start. Thus, basically, there is a hardware side and a software side. The hardware is just a Bluetooth v4.0 device that turns on and off ... that. Now I want to develop an Android application that can connect to this device via Bluetooth and turn the device on and off from the phone. Is there a special Bluetooth chip for this task? Do I have to write a program for the microcontroller so that I can complete this task? If someone could help just point me in the right direction, just to start me, and I can explore the rest, then I would be very grateful. Thank.

Hassan

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Your plan is a bit missing. The Bluetooh chip needs a controller that tells it how to behave.
This usually means some kind of microcontroller, but there is Soc (system on a chip) that includes all the radio, the bluetooth stack and the controller on one device.
There are bluetooth modules that include both bluetooth and a controller, and you can sometimes change the firmware on it to adapt it to a specific task like yours.

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