Issue connecting to MG5050 via Serial
**System**
MG5050 VIA USB-Serial (I have tried two https://www.jaycar.com.au/arduino-compatible-usb-to-serial-adaptor-module/p/XC4464 and http://www.logicware.com.au/6pin-usb-2.0-to-ttl-uart-module-serial-converter-c) using RPi 2 running raspbian.

**Describe the bug**
Running bare bone config haven't enabled anything except for changing the log to debug mode and changing my password to None (I have successfully manage to connect twice and realise that i needed to use None to get in (on my second attempt)). I don't know why I can connect in those two times as nothing has changed (at that point i only had my first board) the only difference is that i haven't tried connecting in about 12 hours so I am not sure if there some sort of persistent session or the panel can lock me out due to multiple failed attempts?

The rest of the time I get the following (even after trying the second USB-Serial), i have also tried numerous different dupont jumper cables in case i have some faulty ones (socket - socket or socket to pin out using a breadboard).

The only thing i have yet to try is using a different RPi (not sure if somehow its not compatible with RPi 2?)

ps. assuming that the serial port goes from TX/RX/GND (I found from an earlier post) i had to cross my tx and rx line on the usb-serial as otherwise it wasn't receiving any data from the panel. 

pss. I have no other device connected to the panel (babyware/ip150 etc etc) this is the sole device. Also not running Docker as I figure I will use the Docker once i can get this up and running manually - using the latest copy from GitHub.

2019-03-21 13:34:02,505 - INFO     - PAI - Starting Paradox Alarm Interface
2019-03-21 13:34:02,507 - INFO     - PAI - Console Log level set to 10
2019-03-21 13:34:03,509 - INFO     - PAI - Using Serial Connection
2019-03-21 13:34:03,546 - INFO     - PAI - Starting...
2019-03-21 13:34:03,549 - INFO     - PAI.paradox.paradox - Connecting to interface
2019-03-21 13:34:03,551 - DEBUG    - PAI.paradox.connections.serial_connection - Opening Serial port: /dev/ttyUSB0
2019-03-21 13:34:03,567 - DEBUG    - PAI.paradox.connections.serial_connection - Serial port open!
2019-03-21 13:34:03,569 - INFO     - PAI.paradox.paradox - Connecting to panel
2019-03-21 13:34:03,572 - INFO     - PAI.paradox.paradox - Initiating communication
2019-03-21 13:34:03,578 - DEBUG    - PAI.paradox.paradox - PC -> A b'72000000000000000000000000000000000000000000000000000000000000000000000072'
2019-03-21 13:34:03,665 - DEBUG    - PAI.paradox.paradox - PC <- A b'72ff10010000a52601024064210747160000010100160220070101001602200700000000fb'
2019-03-21 13:34:03,672 - DEBUG    - PAI.paradox.paradox - Container: 
    fields = Container: 
        length = 36
        offset2 = 36
        offset1 = 0
        data = b'r\xff\x10\x01\x00\x00\xa5&\x01\x02@d!\x07G\x16'... (truncated, total 36)
        value = Container: 
            po = Container: 
                command = 7
                message_center = 2
            new_protocol = 255
            protocol_id = 16
            protocol = Container: 
                version = 1
                revision = 0
                build = 0
            family_id = 165
            product_id = (enum) (unknown) 38
            talker = (enum) CONTROLLER_APPLICATION 1
            application = Container: 
                version = 2
                revision = 64
                build = 100
            serial_number = b'!\x07G\x16' (total 4)
            hardware = Container: 
                version = 0
                revision = 0
            bootloader = Container: 
                version = 1
                revision = 1
                build = 0
                day = 22
                month = 2
                year = 32
            processor_id = 7
            encryption_id = 1
            reserved0 = b'\x01\x00' (total 2)
            label = b'\x16\x02 \x07\x00\x00\x00\x00' (total 8)
    checksum = b'\xfb' (total 1)
2019-03-21 13:34:03,694 - INFO     - PAI.paradox.paradox - Found Panel   version 2.64 build 100
2019-03-21 13:34:03,696 - INFO     - PAI.paradox.paradox - Starting communication
2019-03-21 13:34:03,701 - DEBUG    - PAI.paradox.paradox - PC -> A b'5f200000000000000000000000000000000000000000000000000000000000000002000081'
2019-03-21 13:34:03,715 - DEBUG    - PAI.paradox.paradox - PC <- A b'e0141303150a1300030000000000005a6f6e6520303320202020202020202000000000007e'
2019-03-21 13:34:03,717 - DEBUG    - PAI.paradox.paradox - Unknown message: e0  14  13  03  15  0a  13  00  03  00  00  00  00  00  00  5a  6f  6e  65  20  30  33  20  20  20  20  20  20  20  20  20  00  00  00  00  00  7e 
2019-03-21 13:34:03,718 - DEBUG    - PAI.paradox.paradox - PC -> A b'5f200000000000000000000000000000000000000000000000000000000000000002000081'
2019-03-21 13:34:08,727 - DEBUG    - PAI.paradox.paradox - PC -> A b'5f200000000000000000000000000000000000000000000000000000000000000002000081'
2019-03-21 13:34:13,738 - DEBUG    - PAI.paradox.paradox - PC -> A b'5f200000000000000000000000000000000000000000000000000000000000000002000081'
2019-03-21 13:34:18,749 - DEBUG    - PAI.paradox.paradox - PC -> A b'5f200000000000000000000000000000000000000000000000000000000000000002000081'
2019-03-21 13:34:23,759 - DEBUG    - PAI.paradox.paradox - PC -> A b'5f200000000000000000000000000000000000000000000000000000000000000002000081'
2019-03-21 13:34:28,770 - ERROR    - PAI - Unable to connect to alarm

Thank you in advance! and hopefully I can get this working.
