I think SIII'3 are bluetooth 4.0, which is not BLE - BLE is 4.1, or thats my understanding of it.
So BT 4.0 is back compatible and supports SPP1 but not GATT, methinks. So you're probably out of luck.
Incidentally, my samsung S3 tablets seemed to have had their SPP1 capability locked by the OS until the quite recent android upgrade, as well as their USB host capability. It was pretty hard to get it to do anything useful, so I am very pleased they did the OS upgrade eventually.