MG6250 (unsupported): Serial over Telnet - Timeout while connecting to panel
Hi,

First of all, thank you for taking the time to share ParadoxAlarmInterface!

I'm trying to connect my alarm (Using the Home Assistant addon) but I didn't managed to solve the following issue.

## Alarm system

I have a MG6250 connected in serial with an ESP32 using a LM2596 for voltage regulation as described in the wiki.

```
[Alarm]      [Voltage regulation]        [ESP32]
RX ----------------------------------------> TX
TX ----------------------------------------> RX
- ---------> - IN          - OUT ----------> GND (Using micro USB input)
+ ---------> + IN          + OUT ----------> +   (Using micro USB input)
```

## Question

ESP32 is connected to Wifi correctly and I'm able to ping / telnet into it. 

If instead of connecting the USB input of the ESP 32 to the voltage regulator, I connect it to my PC, I'm able to see the Home Assistant instance connecting to it.

## Error

```
INFO     - PAI - Starting...
INFO     - PAI.paradox.paradox - Connecting to interface
INFO     - PAI.paradox.paradox - Using IP Connection
INFO     - PAI.paradox.connections.ip.connection - Connecting. Try 1/3
INFO     - PAI.paradox.connections.connection - Connection established
INFO     - PAI.paradox.paradox - Connecting to Panel
INFO     - PAI.paradox.interfaces.mqtt.core - MQTT Broker Connected
ERROR    - PAI.paradox.paradox - Timeout while connecting to panel. Is an other connection active?
```

I've tried modifying `MAX_SRV_CLIENTS` to `3` from the `.ino` sketch without success.

## Configuration
```
LOGGING_FILE: null
LOGGING_LEVEL_CONSOLE: 20
LOGGING_LEVEL_FILE: 40
LOGGING_DUMP_PACKETS: true
LOGGING_DUMP_MESSAGES: true
LOGGING_DUMP_STATUS: true
LOGGING_DUMP_EVENTS: true
CONNECTION_TYPE: IP
SERIAL_PORT: /dev/ttyUSB0
SERIAL_BAUD: 9600
IP_CONNECTION_HOST: <ip>
IP_CONNECTION_PORT: 23
IP_CONNECTION_PASSWORD: paradox # tried paradox and null
IP_CONNECTION_SITEID: null
IP_CONNECTION_EMAIL: null
IP_CONNECTION_PANEL_SERIAL: null
IP_CONNECTION_BARE: true
LIMITS: {}
SYNC_TIME: true
PASSWORD: '0000' # Tried 0000 and my main user password
MQTT_ENABLE: true
MQTT_HOST: <host>
MQTT_PORT: 1883
MQTT_USERNAME: <user>
MQTT_PASSWORD: <password>
MQTT_RETAIN: true
MQTT_BIND_ADDRESS: 127.0.0.1
MQTT_BIND_PORT: 0
MQTT_HOMEASSISTANT_AUTODISCOVERY_ENABLE: true
```

## Logs

Encrypted as asked in the issue template:

```
-----BEGIN PGP MESSAGE-----
Version: Keybase OpenPGP v2.1.13
Comment: https://keybase.io/crypto

wcFMA4hORRWTO2jFAQ/9H4m4vSKvMce90kL4PyyufKTwStOrkjPD8iQfGhIe6D66
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b1riGoWYdgxmfiiD+kcNUSrX8ytKXZY0g400kLXm25RKvDPnWVMHcFg7zbJXMPVT
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UHTTttZ5KET87KV9YlvNxE36k50vNrxtiQBQO6xDEt5Pt6S+ljsQ2rfyBUSNrjJM
4YAeJ6zSYXHX+Mi++2Sk7nHbnVMKESaKNUJCmEz5DBQULVQXNhthJ5ULKQL6KGE1
WFhTo4NeVr0S/kSX6nykzGgr3B4YuQbfIRicp0o2TfOkvfMsoOUzgfxEai5JIMRg
7cyIhAVZVDG4a8GMxQu8ycwznMCt66H6uEVJfA5b0/onb4JgWtyiOdeuIXBcMIZz
IfHNDhP4p6mVALsgqZJdfOecSMCROEjVCJ32OWLK0lcJ/WYcFiMy0KmIkJHnXUWn
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1iaqNX0lQqQtkpzgbRxYw62eHwfUFDuy62w53zl1Yw7Axa38C27VtCGiSHeM5kB8
PuagZawJyk+4FpYmc6hbdmJgj7BdIt0zWhpm0uBiRoxEiLpBtXOPCHc+bgTjXUod
0Ff5/1VQuWsSONuO2bsjyJz3jt9nX3koo+ik
=NYsG
-----END PGP MESSAGE-----
```


Do you have any idea or suggestion on how I can solve this issue?

Thank you for any help you might provide.

EDIT: I don't own an IP150 so AFAIK I'm not able to use Babyware to get any kind of password