This guide explains how to access your Home Assistant smart home box (which is behind a dynamic IP address provided by your ISP) with a domain name at Infomaniak via the free DynDNS option and a free script available here.

Preamble

• The integration you install acts as a messenger: it constantly monitors the IP address of your local network.
• As soon as it detects that your ISP has changed your IP, it instantly sends a signal to Infomaniak.
• Infomaniak then updates your domain name (e.g. ha.domain.xyz) to point to the new IP address.

Install Infomaniak DynDNS — Home Assistant Integration

Prerequisites

• Have a Home Assistant installation (e.g. on a Raspberry Pi 5) connected to the Internet with a dynamic IP address.
• A dynamic DNS must have been created on the relevant domain.

Next:

1. Log in to your Home Assistant backoffice.
2. Install HACS if you haven't already; go to the settings of Home Assistant:
   
3. Install the Terminal & SSH app:
   
4. In this terminal, enter the command wget -O - https://get.hacs.xyz | bash -:
5. Once HACS is installed, restart Home Assistant.
6. Activate HACS by searching for it in the integrations:
   
7. Once validation via Github is complete, go back to HACS installed in your left sidebar, then click on the action menu ⋮ at the top right of the HACS interface to choose custom repositories:
   
8. Enter the URL https://github.com/cy-bertrand/Infomaniak-dyndns-ha and choose the type Integration, then click on Add:
   
9. Then search for Infomaniak DynDNS and click on it:
   
10. Install this service by clicking on the Download button at the bottom right:
    
11. Restart Home Assistant.

Configure Infomaniak DynDNS — Home Assistant Integration

To do this:

1. Click on Settings in the left sidebar of HA.
2. Click on Devices & Services:
   
3. Click the button to Add an integration.
4. Click on Infomaniak DynDNS:
   
5. Configure your device:
   
   1. Hostname: the URL configured in the Manager when adding the Dynamic DNS
   2. Username: the identifier defined in the Manager when adding the Dynamic DNS
   3. Password: the password defined in the Manager when adding the Dynamic DNS
6. Validate at the bottom of the page.
7. Give a name to the entity and save your changes by clicking on Finish:
   

Home Assistant will check the external IP every 15 minutes. If it has changed, the DNS will be updated. Thus, your domain name will always point to your home automation installation, even if your Internet Service Provider changes your public IP address.

Also refer to the official plugin documentation.