To collect the BLE broadcasts of the sensors, we used the aruba-iot integration, all APs we deployed at congress this year had BLE and zigbee radios in there. So we could collect the beacons across all the building. And given we know where the APs are we could map CO2 values to locations. And by filtering already on the APs anything that was not from the manufacturer of Aranet, was not send to our infra.
The code that was handeling this can be found on https://github.com/lub-dub/aranet_aruba_exporter