IP client connection problem
Hello,

I have enabled ip client. But when i was trying to connect with BabyWare i`ve got error. 
Basically in paradox.py it calls pause procedure which closes serial connection and exception is thrown that object is null:
 ```
File "/home/robiss/pai/paradox/interfaces/ip_interface.py", line 173, in process_client_message
    payload = self.alarm.send_wait_simple(message=message_payload[:37])
  File "/home/robiss/pai/paradox/paradox.py", line 212, in send_wait_simple
    data = self.connection.read()
  File "/home/robiss/pai/paradox/connections/serial_connection.py", line 59, in read
    recv_data = self.comm.read(read_sz)
```
I have commented connection clossing in paradoxy.py at pause function and now it works! I'm not sure why you was closing serial connection at pause function. Also i'm not good at python :)