The Zucchetti ZCS products in the catalogue: the Azzurro ZSM-WIFI-USB Wi-Fi adapter, the module that links inverters in the Azzurro range to the monitoring portal.
On Zucchetti inverters the dongle is what enables everything else: with no connection you cannot read production or battery state, cannot set self-consumption parameters remotely and cannot update the firmware. It plugs into the dedicated USB port and is configured from the app by joining the home Wi-Fi network.
If the board is in a plant room with weak coverage, think about a repeater: a dongle that keeps dropping out leaves gaps in the production history.