The Device Data Report is an export of raw data which contains all device data for set client /hotspot parameters within the set timeframe. This data is unprocessed and no analytics have been performed. The report is only available as a scheduled report under the Reports > Jobs page. The report will be sent to your email at the scheduled time.
The Device Data report is sent in a .gz file that can be opened using an archive management software like WinZip or 7Zip. Once unzipped the report is stored in a JSON file that can be processed with whatever application you prefer.