Bluetooth 4.0 explicitly prohibits a peripheral to participate inmultiple connections (or assume multiple roles) simultaneouslywith other central devices. Version 4.1 and later incorporate a fundamental change with regard to the roles each device can play when multiple connections are present. That is, a device, regardless of its Link Layer role, can run multiple Link Layer instances simultaneously without limitation. Therefore, a peripheral is allowedto be simultaneously connected to more than one central device.