in some terminals (or all?) the line is not cleared before a new one is output (for example, if you turn on scanning and then try to write something to the terminal, the output will be mixed - you will get something like this [JBL T450BT]# h[NEW] Device **** [JBL T450BT]# he[NEW] Device **** [JBL T450BT]# hell[NEW] Device **** [JBL T450BT]# hello[NEW] Device **** [JBL T450BT]# hello[NEW] Device **** where "Device ****" is the line that was actually fed to bt_shell_printf
