NMDevice @nmdevice: the object which received the signal. @arg1: @arg2: @arg3: @connection: @path: @Returns: @device: @Returns: @device: @Returns: @device: @Returns: @device: @Returns: @device: @Returns: @device: @Returns: @device: @Returns: @device: @Returns: @device: @Returns: @device: @Returns: @device: @Returns: @device: @Returns: @device: @error: @user_data: @device: @callback: @user_data: