Assetwolf contains a handy IoT data simulator that you can use to generate data for your asset "by hand", if you don't yet have connectivity from a real "thing".
To use the Data Simulator:
Here's a sample simulator, as you can see the fields are those of the Asset Type for the given asset:
You can open the Data Simulator on a smart phone, just scan the QR code to see the same thing on your phone.