Relay Switch (GPIO and BLUETOOTH Binding)

How can raspberry pi and relay switch can communicate over bluetooth.(No wire between relay and raspberry pi)

What is your hardware?
What bluetooth relay do you have?

Currently I have a Raspbery pi 3 with Openhab2 installed and REES52 DC 5V 8 Channel Relay Module.

Currently my Relay Module is not having bluetooth. I want to understand what is need (hardware) to this working.

Don’t use bluetooth, use wifi.
Use an ESP8266 module like the wemos mini:
These module have a wifi module inegrated and multiple GPIOs

They can be easily programmed with the Arduino IDE:

And there are many, many tutorials on how to activate a relay using the module, OH and mqtt:

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