AndroidMultiBluetoothSample contains a bluetooth client and a bluetooth server.
Where the bluetooth server can start a bluetooth server socket listenning for clients' connection requests. The bluetooth clients can scan around bluetooth devices, then connect to the server.
When the connection between client and server set up successed, the bluetooth server will show the all connected clients. Click them will send a simple greeting to client.
PS: According to the bluetooth specification,when two Bluetooth devices come into each other’s communication range, one of them assumes the role of master of the communication and the other becomes the slave. This simple “one hop” network is called a piconet, and may include up to seven active slaves connected to one master. As a matter of fact, there is no limit on the maximum number of slaves connected to one master but only seven of them can be active at time, others have to be in so called parked state. The specification also allows multiple roles for the same device, i.e. a node can be a master in one piconet and a slave in another. This permits the connection of several piconets as the nodes functioning in master/slave mode act gateways between piconets.
For more information about the bluetooth ad hoc networking: http://www.netlab.tkk.fi/opetus/s38030/k02/Papers/16-Jari.pdf
My Csdn Blog for this sample project : http://blog.csdn.net/dahaohan/article/details/51222335