The Xcode project has been created using the latest Xcode version 4.4 and targeted for Mountain Lion 10.8
This leverages the work of RobotGrrl and uses the Matatino Framework (https://github.com/RobotGrrl/Matatino) and the tutorials available at appsforarduino.com
The example uses an Arduino (Pro 3.3 8Mhz) that is connected to the MAC using Matatino Framework. This connection is made wireless using BlueSirf Bluetooth module (SPP) profile.
The simple apps makes a connection to this Arduino and then sends serial commands which are then translated to trigger a relay to power a device.
The sample PDE (arduino sketch is also provided).
For more details, check the blog at: tekstop.wordpress.com