Do graceful error handling for socket communication

[thecountoftuscany]

From issue #11, it seems like the program just hangs if the sockets are not configured properly (issue was reproduced on my Windows computer). The program should raise an error and exit instead of getting stuck. This works fine for misconfigured serial port.

[thecountoftuscany]

@Takaklas could you help with this? If not, that's fine, I can try to take a look at it later.