Home Assistant is an excellent open-source home automation platform that runs on a variety of systems, including Raspberry Pi.
It has a web interface that can be accessed by entering the IP address of the device running Home Assistant, followed by the port number that has been configured for the web interface.
When you first setup home assistant your installation will likely be assigned an IP address via DHCP. This IP address will differ based on your home network setup, but you can set a static IP if you prefer, which we would advise.
Out of the box, what should remain the same for all installations of home assistant is the default Home Assistant URL and the Observer URL.
What is Home Assistant URL?
The Home Assistant URL is the URL (Uniform Resource Locator) which you use to access the web interface of Home Assistant.
Depending on your network setup, the easiest (universal) way to access the Home Assistant URL is via;
http://homeassistant.local:8123
Alternatively, if homeassistant.local does not resolve on your local network, you may need to connect to the Home Assistant URL via IP address.
The default URL format would be;
http://[IP address]:[port number]/
So, if the IP address of your device running Home Assistant is 192.168.1.100 and the default port is used, which is 8123 the Home Assistant URL to access the web interface would be;
http://192.168.1.100:8123/
Both should resolve to the Home Assistant web GUI , where you can log in to your instance of Home Assistant;
What Is The Observer URL?
The observer URL is used to keep an eye on the supervisor and make sure everything is working.
It is intended to give you access to some additional troubleshooting information without the need to plug in an external monitor to whichever device is running Home Assistant.
Again, depending on your network setup, the easiest (universal) way to access the Home Assistant Observer URL is via;
http://homeassistant.local:4357
Alternatively, if homeassistant.local does not resolve on your local network, you may need to connect to the Home Assistant Observer URL via IP address.
The default URL format would be;
http://[IP address]:[port number]/
So, if the IP address of your device running Home Assistant is 192.168.1.100 and the default port is used, which is 4357 the Home Assistant Observer URL would be;
http://192.168.1.100:4357/
Both should resolve to the Home Assistant Observer GUI , where you can see some information about your current installation;