Yes, connection some.
But in my firmware you can select current connection type (USB or Serial), speed in menu in any time. Can configure module from NanoVNA console. Can connect different device and command from NanoVNA console.
For example this part (configure HC-05 to speed and name):
AT+NAME=nanoVNA (followed by CR & LF)
AT+UART=38400,0,0 (followed by CR & LF)
Connect HC-05 to NanoVNA, press key on HC-05 module, and turn NanoVNA on (after this HC-05 enter to configuration mode, and possible sent command to it, in configuration mode speed = 38400)
If you know HC-05 speed, possible use it, just press key after power on
Select in CONFIG->CONNECTION->SERIAL SPEED current HC-05 speed
or run in console
'usart_cfg speed'
Run for set name HC-05
usart "AT+NAME=nanoVNA"
get answer OK
Run for set new speed:
AT+UART=115200,0,0
