>You will probably need to wait for the daemon to resolve the services >which will then export the attributes as D-Bus objects that can be >accessed by bluetoothctl, How long would one have to wait? The following was typed manually from the command line: >> # bluetoothctl gatt.select-attribute f000aa22-0451-4000-b000-000000000000 >> # bluetoothctl gatt.acquire-write >> No attribute selected >> # bluetoothctl gatt.write 0x01 >> No attribute selected I had no idea whether the above is the correct syntax or not. I merely guessed, since the procedure does not appear to be documented. John Klug