Connect WiFi - HestiaPi/hestia-touch-openhab GitHub Wiki

As of 10.1 version (July 2018), you can now connect your phone to the "HESTIAPI" network with HESTIAPI as the password. Once connected you will automatically be prompted on your phone to select your WiFi network (no hidden SSID supported yet) and enter the password. Your HestiaPi will restart to connect to your network and the HESTIAPI network will not be shown again if the details were correct.

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For older versions only see below:

Insert it in your non-Windows laptop and change the file

/etc/wpa_supplicant/wpa_supplicant.conf

by entering you WiFi’s SSID and password inside the "".

If your network is using a hidden SSID uncomment this line:

# scan_ssid=1

If you only have Windows machines, from v9.2 onwards, HestiaPi comes preconfigured to connect to a default network with SSID: "HESTIAPI" and password "HESTIAPI" (both without the quotes). All you need to do is create a WiFi network with these details before connecting power to your HestiaPi Touch. Once booted, HestiaPi Touch will connect to it automatically where you can SSH into it and change "HESTIAPI" to your regular WiFi network details. Make sure you enter your details correctly.

If even this is not possible user dexterp37 (thanks!) found some very good alternatives.