These are two popular modules available in market- HC05 and HC06
I bought two HC-06 modules and trying to establish communication between them.
But I failed and a friend of mine said it can be only be used as slave. I verified this by establishing a successful communication between a laptop with Bluetooth, and this module with a Controller board.
But I am not able to understand why this module is made in such a way. Is it not possible to change the mode to master using some software upgrade ? If yes how ?