[[ example baudat session via Serial Monitor ]]

##noise##noise##noise##

This is 57600 bps. Type something. 'U'is robust.

##noise##noise##noise##

baudat HC-05 config tool

Set BT name, "polar" & serial bit rate? [y/n] Y

Set Bluetooth device name? [y/n] Y

New name: My_New_BT_Widget

Set BT connection status polarity? [y/n] Y

When connected, set STATE pin LOW(0) or HIGH(1)? [0/1] 0

Supported serial baud rates:
a: 500000
b: 230400
c: 115200
d: 57600
e: 38400
f: 19200
g: 9600
h: 4800
i: 2400
Select new speed: [a-i] a

==== New parameters ====
BT Name: My_New_BT_Widget
Connected STATE signal level: 0
Baud:  115200

Get ready to press HC-05 command mode button ...
Press when LED lights; release when LED flashes.

Ready? [any key]

Go...
[[ LED lights solid; you would press the command button and see none of the following ]]
AT+NAME=My_New_BT_Widget
AT+POLAR=1,0
AT+UART=115200,0,0
AT+RESET [[ HC-05 resets into 38.4kbps command mode ]]
AT+RESET
[[ LED flashes; you would release the command button ]]
AT+RESET [[ sent at 38.4kbps; resets HC-05 to comms mode at configured rate ]]
[[ repeat from start ]]