Hi!, after installing gatt package on my Nanopi NEO Air, and compiling the discoverer.go example, when i try to run it, i get the following error: 2017/12/01 14:25:27 dev: hci0 up 2017/12/01 14:25:27 dev: hci0 down 2017/12/01 14:25:27 dev: hci0 can't bind to hci user channel, err: invalid argument. ...