In order to use the wireless Bluetooth Data Bridge you will need a compatible iPad. This has to do with hardware support for the Bluetooth LE protocol.
A compatible iPad is defined as one which is running iOS 7+ and includes support for Bluetooth LE (Also referred to as, Bluetooth 4.0, BLE, and Bluetooth Smart). Some older iPads do not have Bluetooth LE chips and will not work.
The list of compatible iPads is:
iPad Air 2
iPad Mini 2
iPad Mini 3
iPad 3rd generation
iPad 4th generation
iPad 5th generation
Any newer iPad than the models listed above will also work.