Timeout when trying to connect with USB TTL serial interface.
Brand new EVO HD panel with 7.31.001 firmware (babyware says so, on the box is says 7.30)
USB TTL adapter: https://www.arduino-fans.pk/item/usb-to-ttl-ch340g-stc-microcontroller-board-usb-to-serial-rs232-converter/
Tried pai on my linux laptop before installing, powered the panel by battery, just to make sure I can get pai working.
Python 3.10.5, pai 3.1.0 installed with pip.
Driver module in use: ch341
1a86:7523 QinHeng Electronics CH340 serial converter

Problem is, I get a timeout when trying to connect. I ran pai-service as root to make sure it has proper access to /dev/ttyUSB0. I tried babyware in a virtualboxed windows 10, with usb passthrough of the serial device, and it worked, it connects without problems.

```
2022-09-06 21:53:06,961 - DEBUG - MainThread - PAI.paradox.connections.protocols - PAI -> SER b'72000000000000000000000000000000000000000000000000000000000000000000000072'
2022-09-06 21:53:07,963 - ERROR - MainThread - PAI.paradox.paradox - Timeout while connecting to panel. Is an other connection active?
```

I could use some more advanced loopback serial transfer tester script to test reliability of linux operation of this device.
I also tried https://github.com/gorgiaxx/CH34x-Driver-Linux driver with no success.

Edit: connecting rx/tx pins in loopback, gives me this in pai, from which we can deduce the adapter is working and transmitting correctly:
2022-09-07 10:42:54,070 - DEBUG - MainThread - PAI.paradox.connections.protocols - PAI -> SER b'72000000000000000000000000000000000000000000000000000000000000000000000072'
2022-09-07 10:42:54,132 - DEBUG - MainThread - PAI.paradox.connections.protocols - SER -> PAI b'72000000000000000000000000000000000000000000000000000000000000000000000072'
2022-09-07 10:42:54,132 - DEBUG - MainThread - PAI.paradox.paradox - Unknown message: 72 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 72

And it also works in windows.. so the problem is with PAI/settings maybe ? I have just this in pai.conf
```
CONNECTION_TYPE = 'Serial'              # Serial or IP
SERIAL_PORT = '/dev/ttyUSB1'            # Pathname of the Serial Port
SERIAL_BAUD = 9600         # 9600 for SP/MG. For EVO: Use 38400(default setting) or 57600
PASSWORD = '0000'                       # PC Password. Set to None if Panel has no Password.
```
Update:
Tried downgrading firmware to 7.2 - no fix
Tried a few older pai version - no fix

