public RemoteDevice retrieveDevices
Returns an array of Bluetooth devices that have either been found by the local device during previous inquiry requests or been specified as a pre-known device depending on the argument. The list of previously found devices is maintained by the implementation of this API. (In other words, maintenance of the list of previously found devices is an implementation detail.) A device can be set as a pre-known device in the Bluetooth Control Center.
option - CACHED if previously found devices should be returned; PREKNOWN if pre-known devices should be returned
an array containing the Bluetooth devices that were previously found if option is CACHED; an array of devices that are pre-known devices if option is PREKNOWN; null if no devices meet the criteria