How to create a master slave connection on two bluetooth modules?

Question

Bluetooth

Good day, there is a task to receive a signal to two bluetooth modules at the same time, ideally I would like to make a master master connection, but I have no idea how to do this at all, so I want to start with a master slave
. It is necessary that one bluetooth module (headphone) receive a signal from smartphone and transmitted to the second module, and both modules played sound at the same time