This page lists the required field names for Analytics Connected Device data, along with the Events Service internal name. When accessing the data using ADQL queries, you need to use the Events Service internal name in the query. Because IoT Monitoring largely depends on custom data, your connected device Analytics data will most likely include many more field names than given below.
Event Type: iot_records
Key (event type identifier): appkey
|UI Field Name||Events Service Internal Name|