Pretty weird, but after forwarding the communication port 55000 (set in the python file for sending commands) to my TV IP address, everything works just fine.
Thanks for your thoughts also!

Hello Everyone!
Can you please help me with some minor problem I have?
I've had a Samsung TV worked with this python code fine, but one day it just went crazy and did nothing for me. It hangs Voxcommando for a while and does nothing. I figured it out that my firewall is the problem, if I disable it than it works fine. All the Voxcommando related stuff is allowed to go through my firewall, and as I wrote it had worked for me before. I can't figure it out what happened from one day to another, I haven't messed with any firewall or network related stuff either. Can you suggest me something to try to get it work again?
Thank you in advance!