troubleshooting Question

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Antone HN asked on
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HI dear,
Apologies in case i didn't use correct terminology, and excuses for my english, after reading the latest leaks regarding zero year and so on... and after checking the leaks from hacking team company last year and discovering that my goverment was on the list with a contract for their softwear and servers etc..

The concerns are and will be for the below right now:

Knowing that nothing is totaly safe and we need to update our knowledge cyber wise,

I want to secure my house from unauthorized access to every device in it such as the:
- door video bell which is connected to  internet through wifi
- Cctv which is also connected to internet
- smart tv wich will be connected
- smart devices which i need to control it through tablets connected also to internet
-pc that will run softwear for the above smart devices such as dimmer and relays and smart sensors curtains ir and rf repeater devices.

Now i will share what i did and what i think i can do and if anyone could please let me know if its fine or not.
-I will use the network port instead of the wifi for door bell even if it will limit the function and i mentioned the door bell because it can unlock the main door of my flat which is assembled not purchased ready, to avoid any complications. But still i need to secure the router and to acces the service i have to use the cloud service provided by the seller which is not safe for sure.

-I had to buy 2 Dvr one will be for inside the house and wont be connected to internet while the other i will connect it and will activate only the cameras mounted outside the flat.

For the other issues i was thinking to use my old pcs and any other pc i can find to build my own server and if possible to have a firewall beside the one that is covered by the routers and modem or the OS used.

Now how effective will be to have my own server and how safe it is if definitely anything could be hacked and is their a way to route the internet connection through a server or a device and then allow or forbide any device from sending data since reciving wont affect in case of smart tv as i undertood from the latest leaks since they will open the camera and or Mic while tv is off but that mean sending and recieving so if you stoped the sending recieving the order wont affect maybe, even though as i undrstood packets needs to go both way in case of connection to internet or else it wont be established.

Finaly any advices beside getting rid of what technologies and human made and provided to use for good but others decided to abuse? I mean it does worth defending our selfs if not taking counter measure at least.
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