Bluetooth. It demonstrates all the fundamental Bluetooth API capabilites, such as:
(1) Scanning for other Bluetooth devices
(2) Querying the local Bluetooth adapter for paired Bluetooth devices
(3) Establishing RFCOMM channels/sockets
(4) Connecting to a remote device
(5) Transfering data over Bluetooth
made using google sample of bluetooth chat.
More improvement will be added in future.