I would like to use a Shelly Uni on my campervan to monitor 3 temperatures and control the lock and unlock an additional safety lock on the main door. The van has a 4G router with WiFi and if everything is ok with the Internet signal, It will work just fine.
The problem I see is when there is no network signal and therefore, no connection to the cloud. How can I unlock the system with the smartphone in this situation? Can the Shelly be accessed and controlled directly via Bluetooth? This would only be used with the Shelly in range, naturally.