Failed to connect: Panel did not replied to InitiateCommunication
## Alarm system
MG5050, connecting to IP150 v1.39.
This is what the script logs: IP Module version 20, firmware: 1.64, serial: 7107bad6

## Environment
- RPi, Raspbian
- Python version 3.7.3

## Git branch
master

## Describe the bug
Cannot connect to IP module. Initial authentication is success  but the next step to make InitiateCommunication does not work.

## To Reproduce
Edit pai.conf as necessary, then python3 run.py

## Logs
```
2019-08-28 08:10:22,778 - INFO     - PAI.paradox.paradox - Connecting to interface
2019-08-28 08:10:22,779 - INFO     - PAI.paradox.connections.ip_connection - Connecting to IP module. Try 1/3
2019-08-28 08:10:22,782 - INFO     - PAI.paradox.connections.ip_connection - Authenticating with IP Module
2019-08-28 08:10:22,788 - DEBUG    - PAI.paradox.connections.ip_connection - PAI -> Mod b'aa0a000309f0000001eeeeeeeeeeeeee08649db36db816c43434d45bed2fc6db'
2019-08-28 08:10:22,791 - DEBUG    - PAI.paradox.connections.ip_connection - Mod -> IPC b'aa19000179f0000000eeeeeeeeeeeeeeb214fe9709fcf283ca02b9da250dbac957e27c102301d04852838601eef4a333'
2019-08-28 08:10:22,803 - DEBUG    - PAI.paradox.connections.ip_connection - IPC -> PAI b'0038423641443230433031443644433235002001407107bad6'
2019-08-28 08:10:22,805 - INFO     - PAI.paradox.connections.ip_connection - Authentication Success. IP Module version 20, firmware: 1.64, serial: 7107bad6
2019-08-28 08:10:22,805 - DEBUG    - PAI.paradox.connections.ip_connection - Sending F2
2019-08-28 08:10:22,808 - DEBUG    - PAI.paradox.connections.ip_connection - PAI -> Mod b'aa00000309f2000001eeeeeeeeeeeeee'
2019-08-28 08:10:22,810 - DEBUG    - PAI.paradox.connections.ip_connection - Mod -> IPC b'aa01000179f2000000eeeeeeeeeeeeeea9bffe53c87e294f7f89aeba1a0ad218'
2019-08-28 08:10:22,818 - DEBUG    - PAI.paradox.connections.ip_connection - IPC -> PAI b'02'
2019-08-28 08:10:22,818 - DEBUG    - PAI.paradox.connections.ip_connection - F2 answer: b'02'
2019-08-28 08:10:22,819 - DEBUG    - PAI.paradox.connections.ip_connection - Sending F3
2019-08-28 08:10:22,821 - DEBUG    - PAI.paradox.connections.ip_connection - PAI -> Mod b'aa00000309f3000001eeeeeeeeeeeeee'
2019-08-28 08:10:22,824 - DEBUG    - PAI.paradox.connections.ip_connection - Mod -> IPC b'aa11000179f3000000eeeeeeeeeeeeee84b956c54290cf5366b1ebd3a5bdc1c31af953b4996f1e822b500f70b25b26cb'
2019-08-28 08:10:22,835 - DEBUG    - PAI.paradox.connections.ip_connection - IPC -> PAI b'0000000000000000000000000000000000'
2019-08-28 08:10:22,836 - DEBUG    - PAI.paradox.connections.ip_connection - Sending F8
2019-08-28 08:10:22,846 - DEBUG    - PAI.paradox.connections.ip_connection - PAI -> Mod b'aa26000309f8000001eeeeeeeeeeeeeef8f3937419116dba92515e76c9f3d00784b956c54290cf5366b1ebd3a5bdc1c3a7cf3751a4a9c640d6d1f7df6dfc3cc4'
2019-08-28 08:10:22,850 - DEBUG    - PAI.paradox.connections.ip_connection - Mod -> IPC b'aa01000179f8000000eeeeeeeeeeeeeeeab534644aed477c4e8c78fc1679a715'
2019-08-28 08:10:22,858 - DEBUG    - PAI.paradox.connections.ip_connection - IPC -> PAI b'01'
2019-08-28 08:10:22,858 - DEBUG    - PAI.paradox.connections.ip_connection - F8 answer: b'01'
2019-08-28 08:10:22,859 - INFO     - PAI.paradox.connections.ip_connection - Session Established with IP Module
2019-08-28 08:10:22,859 - INFO     - PAI.paradox.paradox - Connecting to panel
2019-08-28 08:10:22,860 - INFO     - PAI.paradox.paradox - Initiating communication
2019-08-28 08:10:22,861 - DEBUG    - PAI.paradox.connections.ip_connection - PAI -> IPC b'72000000000000000000000000000000000000000000000000000000000000000000000072'
2019-08-28 08:10:22,872 - DEBUG    - PAI.paradox.connections.ip_connection - IPC -> Mod b'aa2500040900000a01eeeeeeeeeeeeee1083f6f4bb7953834cdb548bc7363bf584b956c54290cf5366b1ebd3a5bdc1c3a3d58160e8ee9dafde57562cab2ada23'
2019-08-28 08:10:23,875 - DEBUG    - PAI.paradox.connections.ip_connection - PAI -> IPC b'72000000000000000000000000000000000000000000000000000000000000000000000072'
2019-08-28 08:10:23,885 - DEBUG    - PAI.paradox.connections.ip_connection - IPC -> Mod b'aa2500040900000a01eeeeeeeeeeeeee1083f6f4bb7953834cdb548bc7363bf584b956c54290cf5366b1ebd3a5bdc1c3a3d58160e8ee9dafde57562cab2ada23'
2019-08-28 08:10:24,888 - DEBUG    - PAI.paradox.connections.ip_connection - PAI -> IPC b'72000000000000000000000000000000000000000000000000000000000000000000000072'
2019-08-28 08:10:24,897 - DEBUG    - PAI.paradox.connections.ip_connection - IPC -> Mod b'aa2500040900000a01eeeeeeeeeeeeee1083f6f4bb7953834cdb548bc7363bf584b956c54290cf5366b1ebd3a5bdc1c3a3d58160e8ee9dafde57562cab2ada23'
2019-08-28 08:10:25,899 - DEBUG    - PAI.paradox.connections.ip_connection - PAI -> IPC b'72000000000000000000000000000000000000000000000000000000000000000000000072'
2019-08-28 08:10:25,920 - DEBUG    - PAI.paradox.connections.ip_connection - IPC -> Mod b'aa2500040900000a01eeeeeeeeeeeeee1083f6f4bb7953834cdb548bc7363bf584b956c54290cf5366b1ebd3a5bdc1c3a3d58160e8ee9dafde57562cab2ada23'
2019-08-28 08:10:26,924 - DEBUG    - PAI.paradox.connections.ip_connection - PAI -> IPC b'72000000000000000000000000000000000000000000000000000000000000000000000072'
2019-08-28 08:10:26,945 - DEBUG    - PAI.paradox.connections.ip_connection - IPC -> Mod b'aa2500040900000a01eeeeeeeeeeeeee1083f6f4bb7953834cdb548bc7363bf584b956c54290cf5366b1ebd3a5bdc1c3a3d58160e8ee9dafde57562cab2ada23'
2019-08-28 08:10:27,950 - DEBUG    - PAI.paradox.connections.ip_connection - PAI -> IPC b'72000000000000000000000000000000000000000000000000000000000000000000000072'
2019-08-28 08:10:27,971 - DEBUG    - PAI.paradox.connections.ip_connection - IPC -> Mod b'aa2500040900000a01eeeeeeeeeeeeee1083f6f4bb7953834cdb548bc7363bf584b956c54290cf5366b1ebd3a5bdc1c3a3d58160e8ee9dafde57562cab2ada23'
2019-08-28 08:10:28,975 - ERROR    - PAI.paradox.paradox - Failed to connect: Panel did not replied to InitiateCommunication
2019-08-28 08:10:28,975 - ERROR    - PAI - Unable to connect to alarm
```

Any idea on how to fix this?
Thank you!