Any reason to support older library versions?

[brianreinhold]

This maybe a stupid question but is there any reason to include support for older versions of the SDKs? I am using the pc-ble-driver approach and the example is full of if-defs on the version. If one does NOT have to worry about backward  compatibility (this is a brand new start and first time use of Nordic products) should I just use the latest version (6 as of this time)? My concern is that the latest version may not work with some older versions/platforms of Android or other existing BLE peers.

[brianreinhold]

No it is not. It was not an HCI; it was an interface that allowed you to access the BLE methods from any mcu like you were on the chip itself. So you could develop, run, and test your app on a PC then take that code and compile it for another mcu.

IN any case, I do not want an HCI; the BLE GAP and GATT levels are exactly what I want.