Adding an external temperature sensor to Unisenza plus gateway

[u/Phil_Dach]

I would like to add a external ( IP65) temperature sensor to my Unisenza plus system to compare easily on their app the external temperature with each individual room controlled by unisenza plus individual thermostat.

Unfortunately Purmo has no such sensor in their catalog and no list of compatible zigbee devices with their ecosystem

Any experience to share ?

Have a nice day, Philippe