You can also contact the TPC at www.tpc.org They are coming up with an IoT benchmark which includes a kit that generates artificial data. The kit is still under development but you can show your interest.

Thanks to all.

https://archive.ics.uci.edu/ml/datasets.html?format=&task=&att=&area=&numAtt=&numIns=&type=ts&sort=nameUp&view=list

http://www.cs.colostate.edu/~skmishra/research.html

https://crawdad.org/keyword-sensor-network.html