That depends on what "side" of GATT link are you looking for;) BLE is asymmetric on pretty much every layer and NUS need GATT Client and GATT Server. ble_nus is GAP Peripheral + GATT Server (usual "embedded" option, that's why it is kind of "default"), ble_nus_c is GAP Central + GATT Client option (usually handled by device with higher power budget = bigger battery).
Do you have clear understanding what will be both sides of your NUS link and what GAP&GATT properties they support? Also consequences on power consumption and co-existence and interworking with other Profiles and Services (if any of these devices is multiapplicational)?
Do you have clear understanding what will be both sides of your NUS link and what GAP&GATT properties they support? Also consequences on power consumption and co-existence and interworking with other Profiles and Services (if any of these devices is multiapplicational)?
