darwin: make stubs return an error
darwin: make stubs return an error

vizidrixfork/gatt,shirou/gatt,devicehive/gatt,paypal/gatt,kmtr/gatt,shirou/gatt,roylee17/gatt,nikhilbharat/gatt,roylee17/gatt,suapapa/gatt,suapapa/gatt,paypal/gatt,nikhilbharat/gatt,kmtr/gatt,devicehive/gatt,beaconinside/gatt,beaconinside/gatt,wheelcomplex/gatt,vizidrixfork/gatt,wheelcomplex/gatt,nikhilbharat/gatt