This release adds wifi, REST API and MQTT API to your Sensorbox-2 ; also it gives you a user interface like the SmartEVSE one, including the /update, /reboot, /erasesettings etc. endpoints.
Although your old Sensorbox-2 does not have wifi enabled, if you upgrade your SmartEVSEv3 to v3.7.2 or newer, you can upgrade your Sensorbox-2 firmware without having to connect to it by usb-c connector; for the full procedure see the readme.