When mcu has bluetooth salve module , it can
communicate with Bluetooth adapter of computer and smart phones.
•The Bluetooth devices in the market mostly are salve devices, such as Bluetooth printer, Bluetooth GPS. So, we can use master module to make pair and communicate with them.
•Bluetooth serial module‟s operation doesn't need drive, and can communicate with the other Bluetoot device.
But communication between two Bluetooth module require at two conditions:
•The communication must be between master and slave.
•The password must be correct.