Enumerates available pairing types. It is used by a DeviceService for implementing pairing strategy.
DeviceService doesn't require pairing
In this mode user must confirm pairing on the first screen device (e.g. an alert on a TV)
In this mode user must enter a pin code from a mobile device and send it to the first screen device
In this mode user can either enter a pin code from a mobile device or confirm pairing on the TV